Applications of robots in urology
Identifieur interne : 002481 ( Pmc/Checkpoint ); précédent : 002480; suivant : 002482Applications of robots in urology
Auteurs : Rahul Thaly [États-Unis] ; Ketul Shah [États-Unis] ; Vipul R. Patel [États-Unis]Source :
- Journal of Robotic Surgery [ 1863-2483 ] ; 2007.
Url:
DOI: 10.1007/s11701-006-0003-9
PubMed: 25484933
PubMed Central: 4247424
Affiliations:
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Applications of robots in urology</title><author><name sortKey="Thaly, Rahul" sort="Thaly, Rahul" uniqKey="Thaly R" first="Rahul" last="Thaly">Rahul Thaly</name><affiliation wicri:level="2"><nlm:aff id="Aff1">Center for Robotic and Computer Assisted Surgery, Division of Urology, Ohio State University, 538 Doan Hall, 410 West 10th Avenue, Columbus, OH 43210-1228 USA</nlm:aff><country xml:lang="fr">États-Unis</country><placeName><region type="state">Ohio</region></placeName><wicri:cityArea>Center for Robotic and Computer Assisted Surgery, Division of Urology, Ohio State University, 538 Doan Hall, 410 West 10th Avenue, Columbus</wicri:cityArea></affiliation></author><author><name sortKey="Shah, Ketul" sort="Shah, Ketul" uniqKey="Shah K" first="Ketul" last="Shah">Ketul Shah</name><affiliation wicri:level="2"><nlm:aff id="Aff1">Center for Robotic and Computer Assisted Surgery, Division of Urology, Ohio State University, 538 Doan Hall, 410 West 10th Avenue, Columbus, OH 43210-1228 USA</nlm:aff><country xml:lang="fr">États-Unis</country><placeName><region type="state">Ohio</region></placeName><wicri:cityArea>Center for Robotic and Computer Assisted Surgery, Division of Urology, Ohio State University, 538 Doan Hall, 410 West 10th Avenue, Columbus</wicri:cityArea></affiliation></author><author><name sortKey="Patel, Vipul R" sort="Patel, Vipul R" uniqKey="Patel V" first="Vipul R." last="Patel">Vipul R. Patel</name><affiliation wicri:level="2"><nlm:aff id="Aff1">Center for Robotic and Computer Assisted Surgery, Division of Urology, Ohio State University, 538 Doan Hall, 410 West 10th Avenue, Columbus, OH 43210-1228 USA</nlm:aff><country xml:lang="fr">États-Unis</country><placeName><region type="state">Ohio</region></placeName><wicri:cityArea>Center for Robotic and Computer Assisted Surgery, Division of Urology, Ohio State University, 538 Doan Hall, 410 West 10th Avenue, Columbus</wicri:cityArea></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">25484933</idno><idno type="pmc">4247424</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4247424</idno><idno type="RBID">PMC:4247424</idno><idno type="doi">10.1007/s11701-006-0003-9</idno><date when="2007">2007</date><idno type="wicri:Area/Pmc/Corpus">000924</idno><idno type="wicri:Area/Pmc/Curation">000924</idno><idno type="wicri:Area/Pmc/Checkpoint">002481</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Applications of robots in urology</title><author><name sortKey="Thaly, Rahul" sort="Thaly, Rahul" uniqKey="Thaly R" first="Rahul" last="Thaly">Rahul Thaly</name><affiliation wicri:level="2"><nlm:aff id="Aff1">Center for Robotic and Computer Assisted Surgery, Division of Urology, Ohio State University, 538 Doan Hall, 410 West 10th Avenue, Columbus, OH 43210-1228 USA</nlm:aff><country xml:lang="fr">États-Unis</country><placeName><region type="state">Ohio</region></placeName><wicri:cityArea>Center for Robotic and Computer Assisted Surgery, Division of Urology, Ohio State University, 538 Doan Hall, 410 West 10th Avenue, Columbus</wicri:cityArea></affiliation></author><author><name sortKey="Shah, Ketul" sort="Shah, Ketul" uniqKey="Shah K" first="Ketul" last="Shah">Ketul Shah</name><affiliation wicri:level="2"><nlm:aff id="Aff1">Center for Robotic and Computer Assisted Surgery, Division of Urology, Ohio State University, 538 Doan Hall, 410 West 10th Avenue, Columbus, OH 43210-1228 USA</nlm:aff><country xml:lang="fr">États-Unis</country><placeName><region type="state">Ohio</region></placeName><wicri:cityArea>Center for Robotic and Computer Assisted Surgery, Division of Urology, Ohio State University, 538 Doan Hall, 410 West 10th Avenue, Columbus</wicri:cityArea></affiliation></author><author><name sortKey="Patel, Vipul R" sort="Patel, Vipul R" uniqKey="Patel V" first="Vipul R." last="Patel">Vipul R. Patel</name><affiliation wicri:level="2"><nlm:aff id="Aff1">Center for Robotic and Computer Assisted Surgery, Division of Urology, Ohio State University, 538 Doan Hall, 410 West 10th Avenue, Columbus, OH 43210-1228 USA</nlm:aff><country xml:lang="fr">États-Unis</country><placeName><region type="state">Ohio</region></placeName><wicri:cityArea>Center for Robotic and Computer Assisted Surgery, Division of Urology, Ohio State University, 538 Doan Hall, 410 West 10th Avenue, Columbus</wicri:cityArea></affiliation></author></analytic><series><title level="j">Journal of Robotic Surgery</title><idno type="ISSN">1863-2483</idno><idno type="eISSN">1863-2491</idno><imprint><date when="2007">2007</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Schuessler, Ww" uniqKey="Schuessler W">WW Schuessler</name></author><author><name 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<front><journal-meta><journal-id journal-id-type="nlm-ta">J Robot Surg</journal-id><journal-id journal-id-type="iso-abbrev">J Robot Surg</journal-id><journal-title-group><journal-title>Journal of Robotic Surgery</journal-title></journal-title-group><issn pub-type="ppub">1863-2483</issn><issn pub-type="epub">1863-2491</issn><publisher><publisher-name>Springer-Verlag</publisher-name><publisher-loc>London</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">25484933</article-id><article-id pub-id-type="pmc">4247424</article-id><article-id pub-id-type="publisher-id">3</article-id><article-id pub-id-type="doi">10.1007/s11701-006-0003-9</article-id><article-categories><subj-group subj-group-type="heading"><subject>Review Article</subject></subj-group></article-categories><title-group><article-title>Applications of robots in urology</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Thaly</surname><given-names>Rahul</given-names></name><xref ref-type="aff" rid="Aff1"></xref></contrib><contrib contrib-type="author"><name><surname>Shah</surname><given-names>Ketul</given-names></name><xref ref-type="aff" rid="Aff1"></xref></contrib><contrib contrib-type="author" corresp="yes"><name><surname>Patel</surname><given-names>Vipul R.</given-names></name><address><phone>+1-614-2930980</phone><fax>+1-614-2930982</fax><email>Patel.914@osu.edu</email></address><xref ref-type="aff" rid="Aff1"></xref></contrib><aff id="Aff1">Center for Robotic and Computer Assisted Surgery, Division of Urology, Ohio State University, 538 Doan Hall, 410 West 10th Avenue, Columbus, OH 43210-1228 USA</aff></contrib-group><pub-date pub-type="epub"><day>2</day><month>2</month><year>2007</year></pub-date><pub-date pub-type="pmc-release"><day>2</day><month>2</month><year>2007</year></pub-date><pub-date pub-type="ppub"><year>2007</year></pub-date><volume>1</volume><issue>1</issue><fpage>3</fpage><lpage>17</lpage><history><date date-type="accepted"><day>24</day><month>11</month><year>2006</year></date></history><permissions><copyright-statement>© Springer London 2007</copyright-statement></permissions><custom-meta-group><custom-meta><meta-name>issue-copyright-statement</meta-name><meta-value>© Springer London 2007</meta-value></custom-meta></custom-meta-group></article-meta></front><body><sec id="Sec1" sec-type="introduction"><title>Introduction</title><p>During the last two decades the field of urology has seen a tremendous growth in minimally invasive surgery. Potential advantages with this shift toward laparoscopic surgery include smaller incisions, reduced blood loss, less post-operative pain with reduced intake of narcotics, shorter hospital stays, and faster recovery. Nephrectomy, adrenalectomy, pyeloplasty, and prostatectomy have all established themselves as procedures benefitting from minimally invasive surgery. Complex laparoscopic procedures, for example prostatectomy, have proven to be quite a daunting task, because of the steep learning curve for many urologists [<xref ref-type="bibr" rid="CR1">1</xref>]. Factors limiting the performance of standard laparoscopic radical prostatectomy are counter-intuitive motion, the lack of depth perception secondary to 2D vision, and rigid instrumentation with only four degrees of surgical freedom. These factors hinder visualization, dissection, and suturing in small spaces [<xref ref-type="bibr" rid="CR1">1</xref>].</p><p>Introduction of robotic technology into modern day surgery has removed many of these technical barriers and has the potential to facilitate the broad-based adoption of complex laparoscopic procedures. There are more than 400 robotic systems in the USA and over 30,000 robotic procedures have been performed (communication with Intuitive Surgical). Although, initially, the equipment was conceived for use in cardiac surgery, adoption has been strongest in urology. It seems that robotic surgery has been uniquely adapted to urology, especially prostatectomy, because of the unique advantage of miniature instruments in the pelvis. Although prostatectomy is the main use of robotic surgery in urology its use in other urologic procedures is expanding rapidly as surgeons become more adept with its use. We review the current status of robotic technology, the constraints to its use and the surgical applications of robotic technology in urology.</p></sec><sec id="Sec2"><title>History of robotics</title><p>The word robot comes from the Czech word “robota” meaning compulsory labor. By strict definition, in the Oxford English Dictionary, a robot is a mechanism guided by automatic control. The classic impression of a robot is a mechanical device that performs pre-programmed repetitive tasks. These attributes are often used in industry to “mass produce and improve efficiency” in, for example, auto assembly plants and computer manufacturing. In surgery robots have a different role, because of different demands and applications. Surgical robots must have the capability of a human interface to enable real-time guidance in different scenarios. Modern day surgical robots are a form of computer-assisted surgery in which, by using a “master–slave relationship”, the surgeon can control the actions of the robot in real time, using the robot to improve his/her vision, dexterity, and overall surgical precision.</p></sec><sec id="Sec3"><title>Robotic applications in surgery</title><p>The first generation of surgical robotic assistance was tested in the mid to late 1980s in the fields of neurosurgery, urology, and orthopedic surgery. In neurosurgery many systems have been used as neuronavigators, stereotactic localizers, and robotic assistants in surgery. The first system was used in 1985 and was called the Puma 560. It was used to orient a needle for a brain biopsy under computerized tomography guidance [<xref ref-type="bibr" rid="CR2">2</xref>]. In 1989 a group at Imperial College (London, UK) developed the concept of using a robot (Probot) in urology to perform transurethral resection of the prostate [<xref ref-type="bibr" rid="CR3">3</xref>]. Because the prostate is a relatively fixed organ and the procedure requires repetitive movements this operation was a good candidate for robotic intervention.</p><p>In orthopedics the RoboDoc system (Integrated Surgical Systems, Sacramento, CA, USA) was designed to address potential human errors in performing cement-less total hip replacements [<xref ref-type="bibr" rid="CR4">4</xref>]. This system helped the surgeon mill a hole in the femur and thus produce cavities that were ten times more accurate than could be achieved by manual reaming [<xref ref-type="bibr" rid="CR5">5</xref>].</p><p>As the development of robotics progressed, more advanced robotic systems with a broader array of clinical applications appeared. The new era of telepresence surgery, that enables the surgeon to operate at a distance from the operating room, was simultaneously developed at the Stanford Research Institute, the Department of Defense, and the National Aeronautics and Space Administration (NASA) [<xref ref-type="bibr" rid="CR6">6</xref>]. The initial purpose was to create a prototype to suit the needs of the military, and the robotic arms were designed to be mounted on an armored vehicle to provide immediate operative care in the battlefield. Surgeons would be able to use the telepresence technology to operate in the battlefield from a safe distance. Soon thereafter, Intuitive Surgical acquired the prototype and commercialized the system called da Vinci.</p></sec><sec id="Sec4"><title>Commercially available robots</title><sec id="Sec5"><title>Robotic integrated surgical system</title><p>In the early 1990s Computer Motion (Goleta, CA, USA) developed the Zeus robot which is a master–slave system. It was specifically designed for cardiac operations, for example coronary artery bypass grafting; later, however, it was diversified for several surgical specialties, for example general surgery, urology, and gynecology [<xref ref-type="bibr" rid="CR7">7</xref>]. This system consists of a control unit, an Aesop robotic arm for a camera, and two robotic arms which are directly mounted on the operating table. Standard Zeus instruments have four degrees of freedom. The Zeus system has two subsystems “the surgeon-side” and the “patient-side”. The surgeon’s subsystem consists of a console that can be positioned anywhere in the operating room. The console consists of a video monitor and two handles that control the robotic arms holding the surgical instruments. The patient-side subsystem consists of three robotic arms attached to the table. The disadvantages of the initial Zeus system included instruments lacking intra-abdominal articulation and the console containing a 2D viewing monitor. Three-dimensional vision and instruments with intra-abdominal articulation capabilities were added to later versions of the surgical system. This system is currently no longer commercially available.</p></sec><sec id="Sec6"><title>Immersive telerobotic surgical system</title><p>In 2000 the FDA approved the da Vinci robotic system (Fig. <xref rid="Fig1" ref-type="fig">1</xref>a, b), a type of master–slave system, for clinical use.<fig id="Fig1"><label>Fig. 1</label><caption><p><bold>a </bold>da Vinci robot, <bold>b </bold>range of motion</p></caption><graphic xlink:href="11701_2006_3_Fig1_HTML" id="MO1"></graphic></fig></p><p>The da Vinci system is based on three components:<list list-type="order"><list-item><p>a master–slave, software-driven system that enables intuitive control of laparoscopic instruments with six degrees of freedom;</p></list-item><list-item><p>a stereoscopic vision system displayed in an immersive format; and</p></list-item><list-item><p>a system composed of redundant sensors to provide maximum safety in operation [<xref ref-type="bibr" rid="CR8">8</xref>].</p></list-item></list>The system consists of three separate units [<xref ref-type="bibr" rid="CR9">9</xref>]:
</p><sec id="d30e269"><title>Console</title><p>The console is positioned remotely from the patient and connected by a cable to the video cart and the surgical cart. The FDA requires that in the United States all operations using the da Vinci surgical system be performed in the same room as the patient. The console houses a stereoviewer, which has an infrared beam to deactivate the robotic arms whenever the surgeon moves his head out of the console. The surgeon’s hands are inserted into free-moving “masters” or finger controls, which convert the movements of the surgeon’s wrist and fingertips into electric signals. These are then converted to computer commands to direct the robotic instruments to perform the same movements in the operative field. The console has controls for 3D viewing, the height of the console, the ability to choose a 0° or 30° laparoscope, motion scaling (5–1 means that five units of motion of the surgeons hands are reduced to one unit of motion for the instruments), and tremor filtration. There is an ability to control the camera, energy devices, and the “masters” with foot pedals.</p></sec><sec id="d30e274"><title>Video cart</title><p>The video cart has two video camera control boxes and two light sources, in addition to a synchronizer.</p></sec><sec id="d30e279"><title>Surgical cart</title><p>The surgical cart supports either three or four robotic arms. Surgical instruments are attached to the robotic arms through an adapter, which uses an 8-mm da Vinci-specific port. The central robotic arm houses a 12 mm telescope, which contains two separate 5-mm telescopes for 3D vision. The robotic surgical instruments are capable of intra-abdominal articulations with seven degrees of freedom. The robotic instruments can be used for up to ten cases after which they must be replaced.</p><p>Disadvantages include the lack of tactile feedback, bulky robotic arms with large excursion arcs that can lead to collisions, limited instrumentation, and the inability to move the surgical table when the robot arms are attached to the ports. The large size of the robot also limits the ability of surgical assistants to maneuver around the patient.</p></sec></sec></sec><sec id="Sec7"><title>Robotic urology procedures</title><sec id="Sec8"><title>Prostatectomy</title><p>During the last half decade robotic prostatectomy has become the backbone of robotic surgical applications in urology. Robotic prostatectomy is viewed as the most natural application, because the small-wristed instrumentation and magnified 3D view have significant advantages when working deep in the pelvis.</p><p>Radical retropubic prostatectomy is currently the best treatment for clinically localized carcinoma of the prostate [<xref ref-type="bibr" rid="CR10">10</xref>]. It has been shown to have significant survival benefit in those treated in the early stages of the disease. Robotic radical prostatectomy has the potential to challenge this as the best treatment, because of its minimally invasive nature and promising short-term outcomes, which include operative time, blood loss, length of hospital stay, post-operative pain, continence, potency, and oncologic outcomes.</p></sec><sec id="Sec9"><title>Peri-operative outcomes</title><sec id="Sec10"><title>Operative time</title><p>It is difficult to compare operative times between different series because of variations in the reporting of operative time, including setup and/or pelvic lymph node dissection. The mean operative time for reported robotic series ranges from 141 to 540 min [<xref ref-type="bibr" rid="CR11">11</xref>–<xref ref-type="bibr" rid="CR23">23</xref>], however, and decreases substantially with increasing surgeon experience. In our initial experience of 200 cases, operative time declined from a mean of 202 min for our first 50 cases to 141 min for the last 50 [<xref ref-type="bibr" rid="CR23">23</xref>]. With our series now growing to over 1,000 cases mean operative times have been further reduced to less than 90 min (unpublished data). Ahlering et al. [<xref ref-type="bibr" rid="CR18">18</xref>] have reported a similar experience-related reduction in operative time with a mean of 184 min for their last ten cases compared with the overall mean operative time of 207 min. For experienced surgeons there does not seem to be a significant difference between operative times for RRP and RALP, with both routinely being performed in less than 3 h [<xref ref-type="bibr" rid="CR22">22</xref>, <xref ref-type="bibr" rid="CR24">24</xref>].</p></sec><sec id="Sec11"><title>Blood loss and transfusion</title><p>Autologous blood transfusion carries a small but significant risk of transfusion reaction and infection with HIV or hepatitis C. Reduction of the need for transfusion is thus of benefit to the patient (Fig. <xref rid="Fig2" ref-type="fig">2</xref>). Reduced intraoperative blood loss has been regarded as one of the hallmark advantages of laparoscopic prostatectomy [<xref ref-type="bibr" rid="CR11">11</xref>]. Early identification and precise ligation of vessels facilitates this limitation of blood loss (Fig. <xref rid="Fig2" ref-type="fig">2</xref>). The tamponade effect of the pneumoperitoneum helps diminish blood loss from venous sinuses. Transfusion after RALP has been reported to be 0–17% [<xref ref-type="bibr" rid="CR11">11</xref>–<xref ref-type="bibr" rid="CR16">16</xref>, <xref ref-type="bibr" rid="CR18">18</xref>–<xref ref-type="bibr" rid="CR23">23</xref>, <xref ref-type="bibr" rid="CR25">25</xref>], with 0% transfusion for six of these studies [<xref ref-type="bibr" rid="CR15">15</xref>, <xref ref-type="bibr" rid="CR18">18</xref>, <xref ref-type="bibr" rid="CR19">19</xref>, <xref ref-type="bibr" rid="CR22">22</xref>, <xref ref-type="bibr" rid="CR25">25</xref>, <xref ref-type="bibr" rid="CR26">26</xref>]. In a comparative study for a single surgeon, Tewari et al. [<xref ref-type="bibr" rid="CR24">24</xref>] report a significantly higher rate of transfusion after RRP (67%) than after RALP (0%). The mean estimated blood loss in the RALP series was 75 mL (10–900 mL), with most being less than 200 mL [<xref ref-type="bibr" rid="CR11">11</xref>–<xref ref-type="bibr" rid="CR16">16</xref>, <xref ref-type="bibr" rid="CR18">18</xref>–<xref ref-type="bibr" rid="CR20">20</xref>, <xref ref-type="bibr" rid="CR22">22</xref>, <xref ref-type="bibr" rid="CR23">23</xref>, <xref ref-type="bibr" rid="CR25">25</xref>].
<fig id="Fig2"><label>Fig. 2</label><caption><p>Dorsal vein ligation</p></caption><graphic xlink:href="11701_2006_3_Fig2_HTML" id="MO2"></graphic></fig></p></sec><sec id="Sec12"><title>Length of hospital stay</title><p>Length of hospitalization is an important component of convalescence after surgery and is often regarded as a measure of patient well-being. Shorter hospitalization is indicative of less morbidity and faster recovery. It is, however, often variable and depends on the type of surgery, the clinical pathway, surgeon practice patterns, and cultural differences. The usual length of stay after an open surgical approach varies between 1 and 3 days. In more recent RALP series in the USA the mean length of stay (LOS) has been reported to be 1.08–1.5 days, declining with increasing surgical experience [<xref ref-type="bibr" rid="CR15">15</xref>–<xref ref-type="bibr" rid="CR20">20</xref>, <xref ref-type="bibr" rid="CR22">22</xref>, <xref ref-type="bibr" rid="CR23">23</xref>]. Ahlering et al. [<xref ref-type="bibr" rid="CR22">22</xref>] reported shorter LOS in patients after RALP than after RRP (25.9 compared with 52.8 h) performed by the same surgeon. Tewari et al. [<xref ref-type="bibr" rid="CR24">24</xref>] reported similar findings with mean LOS for the RALP group being 1.2 days compared with 3.5 days for the RRP group. Similarly, our LOS was 1.2 days, with 95% of the patients being discharged on post-operative day one.</p></sec><sec id="Sec13"><title>Post-operative pain</title><p>As with most minimally invasive procedures, RALP is performed through several small incisions and is associated with minimal post-operative pain. In the few published studies, there are conflicting reports on reduction of post-operative pain with RALP. In studies by Menon et al. there was a statistically significant difference in visual analog pain score on post-operative day one with RALP, with a mean score of three [<xref ref-type="bibr" rid="CR1">1</xref>, <xref ref-type="bibr" rid="CR27">27</xref>–<xref ref-type="bibr" rid="CR32">32</xref>], compared with RRP, with a mean score of seven [<xref ref-type="bibr" rid="CR15">15</xref>, <xref ref-type="bibr" rid="CR19">19</xref>]. In a study by Webster et al. the converse was reported, with no statistical difference between pain on the day of surgery; using the Likert pain scale RALP had a mean score of 2.52 compared with 2.88 in the RRP group [<xref ref-type="bibr" rid="CR33">33</xref>]. Prospective analyses comparing the two are currently pending.</p></sec></sec><sec id="Sec14"><title>Continence</title><p>One primary surgical objective when performing prostatectomy is maintenance of continence. This is often a significant area of concern for the patient when considering treatment options. Precise mucosa to mucosa approximation and optimum preparation of the urethral stump are important in preservation of continence and prevention of stricture [<xref ref-type="bibr" rid="CR34">34</xref>]. Younger age, preservation of the neurovascular bundle, and absence of pre-operative stricture have also been reported to increase the chance of retaining or regaining continence after surgery [<xref ref-type="bibr" rid="CR35">35</xref>].</p><p>In earlier series of RRP, occurrence of incontinence based on patient-reported surveys was as high as 50% [<xref ref-type="bibr" rid="CR36">36</xref>–<xref ref-type="bibr" rid="CR39">39</xref>]. Walsh et al. [<xref ref-type="bibr" rid="CR10">10</xref>] reported continence (no pad usage in past 4 weeks) to be 54% at 3 months, 80% at 6 months, 93% at 12 months, and 93% at 18 months. No pad use three months after RRP has been reported to be between 50 and 76% [<xref ref-type="bibr" rid="CR22">22</xref>, <xref ref-type="bibr" rid="CR40">40</xref>, <xref ref-type="bibr" rid="CR41">41</xref>]. For most series, continence after RRP is reported to be greater than 90% and in one series was as high as 95% 12 months post-operation [<xref ref-type="bibr" rid="CR35">35</xref>, <xref ref-type="bibr" rid="CR40">40</xref>, <xref ref-type="bibr" rid="CR42">42</xref>–<xref ref-type="bibr" rid="CR46">46</xref>].</p><p>It has been proposed that RALP can potentially result in better continence or an earlier return of continence as a result of improved preservation of urethral sphincter, increased urethral length (Fig. <xref rid="Fig3" ref-type="fig">3</xref>), and a water-tight anastomosis. Ahlering et al. [<xref ref-type="bibr" rid="CR18">18</xref>] have reported continence of 33, 63, and 81% 1 week and 1 and 3 months after RALP. In a comparative study, Ahlering et al. [<xref ref-type="bibr" rid="CR22">22</xref>] found no significant difference between overall continence after RALP (76%) compared with RRP (75%) when performed by the same surgeon. Tewari et al. [<xref ref-type="bibr" rid="CR24">24</xref>], however, have shown return to continence to be quicker in the RALP group with 50% being continent at 44 days compared with 160 days for RRP. In the landmark initial reports of RALP, Pasticier [<xref ref-type="bibr" rid="CR11">11</xref>] reported 80% of patients to be continent 9 days post-operation and Binder [<xref ref-type="bibr" rid="CR13">13</xref>] reported 50% continence at 1 month. Menon et al. [<xref ref-type="bibr" rid="CR34">34</xref>] have recently reported continence (no pads) of 96% 3 months post-operation. In our study of 200 patients, continence (no pads) at 1, 6, and 12 months was 47, 89, and 98%, respectively [<xref ref-type="bibr" rid="CR23">23</xref>].
<fig id="Fig3"><label>Fig. 3</label><caption><p>Long urethral stump</p></caption><graphic xlink:href="11701_2006_3_Fig3_HTML" id="MO3"></graphic></fig></p></sec><sec id="Sec15"><title>Potency</title><p>Theoretically, de-novo erectile dysfunction after prostatectomy occurs because of injury of the neurovascular bundles. Such damage can occur as a result of thermal or traction injury, direct incision, or incorporation of the nerve into hemostatic sutures or clips. Younger age, better pre-operative potency, and extent of neurovascular bundle preservation are factors that have been shown to affect post-operative return of erectile function [<xref ref-type="bibr" rid="CR47">47</xref>]. It has been proposed that RALP may prevent damage to the neurovascular bundle. Dissection occurs in an antegrade fashion, reducing traction on the nerve. Better vision, because of magnification and reduced blood in the surgical field, enables more precise dissection, preventing inadvertent incision or incorporation into the suture (Fig. <xref rid="Fig4" ref-type="fig">4</xref>).
<fig id="Fig4"><label>Fig. 4</label><caption><p>Neurovascular bundle</p></caption><graphic xlink:href="11701_2006_3_Fig4_HTML" id="MO4"></graphic></fig></p><p>Potency outcomes are difficult to compare across series because of differences between definitions of potency and patient selection. Overall potency after RRP is reported to be 62–68% at high volume centers but has been reported to be as low as 10–30% in patient reported-surveys [<xref ref-type="bibr" rid="CR25">25</xref>, <xref ref-type="bibr" rid="CR36">36</xref>–<xref ref-type="bibr" rid="CR39">39</xref>, <xref ref-type="bibr" rid="CR42">42</xref>–<xref ref-type="bibr" rid="CR45">45</xref>].</p><p>In series by Quinlan et al. [<xref ref-type="bibr" rid="CR48">48</xref>] potency was 90% for men younger than 50 undergoing RRP with preservation of one or both neurovascular bundles but was lower for men older than 50, especially if both neurovascular bundles were not preserved. Walsh et al. [<xref ref-type="bibr" rid="CR10">10</xref>] have also reported overall potency, defined as intercourse with or without the use of sildenafil, to be 38% at 3 months, 54% at 6 months, 73% at 12 months, and 86% at 18 months.</p><p>In a recent series of 565 RALP, Menon and Tewari [<xref ref-type="bibr" rid="CR15">15</xref>] report that 82% of preoperatively potent patients younger than 60 (and 75% older than 60) had return of some sexual activity by their 6 month follow-up. In their prospective series comparing RRP to RALP, Tewari et al. [<xref ref-type="bibr" rid="CR24">24</xref>] reported a more rapid return of erection after RALP (50% return at a median follow-up of 180 days for RALP compared with 440 days for RRP) and more rapid return to intercourse (50% at 340 days for RALP compared with <50% at >700 days for RRP). Most recently, Menon et al. [<xref ref-type="bibr" rid="CR49">49</xref>] reported 97% potency one year after RALP for men with a preoperative sexual health inventory for men (SHI-M) score greater than 21.</p></sec></sec><sec id="Sec16"><title>Oncologic outcomes</title><p>Most contemporary open RRP series report overall margin positive rates (MPR) of 12–25% [<xref ref-type="bibr" rid="CR47">47</xref>]. In a literature review, Wieder and Soloway reported positive margin rates after RRP to range from 0 to 77% with an overall average of 28% in reviewed RRP series [<xref ref-type="bibr" rid="CR2">2</xref>]. In this review, they also report margin positive rates (MPR) for T2a disease to be 0–38% with an average of 17%, 11–77% with an average of 36% for T2b, and 25–59% with an average of 53% for T3 disease. Han et al. [<xref ref-type="bibr" rid="CR3">3</xref>] have reported MPR as low as 2.7% for T2 disease after RRP.</p><p>The reported MPR after RALP series range from 0 to 36% [<xref ref-type="bibr" rid="CR11">11</xref>–<xref ref-type="bibr" rid="CR16">16</xref>, <xref ref-type="bibr" rid="CR18">18</xref>–<xref ref-type="bibr" rid="CR23">23</xref>, <xref ref-type="bibr" rid="CR25">25</xref>]. When stratified by stage, MPR after RALP ranges from 0 to 17% for T2a, 0–33% for T2b, 0–82% for T3a, 20–50% for T3b, and 33–67% for T4 [<xref ref-type="bibr" rid="CR11">11</xref>–<xref ref-type="bibr" rid="CR16">16</xref>, <xref ref-type="bibr" rid="CR18">18</xref>–<xref ref-type="bibr" rid="CR23">23</xref>]. Ahlering et al. [<xref ref-type="bibr" rid="CR18">18</xref>] reported a trend toward a higher rate of positive surgical margins in the open RRP group (20%) compared with the RALP group (16.7%), although it did not reach statistical significance. In our series of 200 patients the positive margin rate for T2, T3a, T3b, and T4 tumors was 5.7, 29, 20, and 33%, respectively [<xref ref-type="bibr" rid="CR23">23</xref>]. As our technique has been refined and our series has grown we have seen improved MPRs for T2 disease. In our series of 500 patients, the positive margin rate was 9.4% for the entire series (unpublished results). The positive margin rate was 13% for cases 1–100, 8% for 101–200, 13% for 201–300, 5% for 301–400, and 8% for 401–500. For organ-confined disease (T2) the margin positive rate was 2.5% and for non-organ confined disease it was 31%. There were a total of 47 positive margins, 26 (56%) posterolateral, 4 (8.5%) apical, 4 (8.5%) bladder neck, 2 (4%) seminal vesicle, and 11 (23%) multifocal.</p><p>For the RALP to be accepted as a satisfactory alternative to current best practice, oncologic outcomes must be proven to be uncompromised. Although initial reports (Table <xref rid="Tab1" ref-type="table">1</xref>) have shown promise with surrogate markers, for example positive margin rate and short-term prostate-specific antigen (PSA) recurrence data, long-term outcomes are currently unavailable. Because the procedure is only 5 years old, the PSA recurrence data are immature and will not be available in the near future. We must therefore monitor progress closely over the coming years before reaching a definitive conclusion.
<table-wrap id="Tab1"><label>Table 1</label><caption><p>Operative characteristics and outcomes of RALP</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left">Investigators</th><th align="left">Patients (<italic>N</italic>)</th><th align="left">Age (years)</th><th align="left">PSA (ng L<sup>−1</sup>)</th><th align="left">Access</th><th align="left">Operative time (min)</th><th align="left">Blood loss (mL)</th><th align="left">Transfusion rate (%)</th><th align="left">Hospital stay (day)</th><th align="left">Catheter time (day)</th><th align="left">Complications (%)</th><th align="left">Positive margin (%)</th></tr></thead><tbody><tr><td align="left">Binder [<xref ref-type="bibr" rid="CR13">13</xref>]</td><td align="left">10</td><td align="left">60.5</td><td align="left">6.4</td><td align="left">TP</td><td align="left">540<sup>a</sup></td><td align="left">NR</td><td align="left">10</td><td align="left">NR</td><td align="left">18</td><td align="left">10</td><td align="left">30</td></tr><tr><td align="left">Menon [<xref ref-type="bibr" rid="CR15">15</xref>]</td><td align="left">200</td><td align="left">59.9</td><td align="left">6.2</td><td align="left">TP</td><td align="left">160<sup>a</sup></td><td align="left">153</td><td align="left">0</td><td align="left">1.2</td><td align="left">7</td><td align="left">4</td><td align="left">6</td></tr><tr><td align="left">Wolfram [<xref ref-type="bibr" rid="CR20">20</xref>]</td><td align="left">81</td><td align="left">63</td><td align="left">8.96</td><td align="left">TP</td><td align="left">250</td><td align="left">300</td><td align="left">12</td><td align="left">NR</td><td align="left">14</td><td align="left">NR</td><td align="left">22.2</td></tr><tr><td align="left">Aherling [<xref ref-type="bibr" rid="CR22">22</xref>]</td><td align="left">60</td><td align="left">62.9</td><td align="left">8.1</td><td align="left">TP</td><td align="left">231</td><td align="left">105</td><td align="left">0</td><td align="left">1.08</td><td align="left">7</td><td align="left">6.7</td><td align="left">16.7</td></tr><tr><td align="left">Cathelineau [<xref ref-type="bibr" rid="CR25">25</xref>]</td><td align="left">105</td><td align="left">NR</td><td align="left">8</td><td align="left">TP/EP</td><td align="left">180</td><td align="left">500</td><td align="left">6</td><td align="left">5.5</td><td align="left">7</td><td align="left">6.7</td><td align="left">22</td></tr><tr><td align="left">Patel [<xref ref-type="bibr" rid="CR23">23</xref>]</td><td align="left">200</td><td align="left">59.5</td><td align="left">7.1</td><td align="left">TP</td><td align="left">141.2</td><td align="left">75</td><td align="left">0</td><td align="left">1.1</td><td align="left">7.2</td><td align="left">1</td><td align="left">10.5</td></tr></tbody></table><table-wrap-foot><p><sup>a</sup>Includes pelvis lymph node dissection</p></table-wrap-foot></table-wrap></p></sec><sec id="Sec17"><title>Robotic renal surgery</title><p>Another potential application of the use of robotics is in renal surgery. Guillonneau and colleagues [<xref ref-type="bibr" rid="CR4">4</xref>] performed the first robot-assisted laparoscopic nephrectomy in humans using the Zeus system (Computer Motion) in 2001. In 2002, Horgan et al. [<xref ref-type="bibr" rid="CR5">5</xref>] reported their early experience in 12 successful cases of robotic living donor nephrectomy (Table <xref rid="Tab2" ref-type="table">2</xref>). The authors concluded that the length of the dissected vessels, and therefore the quality of the allograft, is improved as a result of enhancement of the dexterity of the robot. Despite this, adoption of robotic radical nephrectomy has not occurred as quickly as with prostatectomy. This is probably because the technical advantages, suturing and reconstruction, provided by the robotic approach are not often needed during nephrectomy.
<table-wrap id="Tab2"><label>Table 2</label><caption><p>Operative characteristics and outcomes of robot-assisted donor nephrectomy</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left">Investigators</th><th align="left">Patients (<italic>N</italic>)</th><th align="left">OR time (min)</th><th align="left">Warm ischemia time (min)</th><th align="left">Blood loss (mL)</th><th align="left">Complications</th><th align="left">Hospital stay (day)</th><th align="left">Return to activity (day)</th></tr></thead><tbody><tr><td align="left">Horgan [<xref ref-type="bibr" rid="CR5">5</xref>]</td><td align="left">12</td><td align="left">166</td><td align="left">79</td><td align="left">68</td><td align="left">Ileus in 1 patient, wound infection 1 patient</td><td char="." align="char">1.91</td><td align="left">26.3</td></tr><tr><td align="left">Renoult [<xref ref-type="bibr" rid="CR75">75</xref>]</td><td align="left">13</td><td align="left">185.5</td><td align="left">435</td><td align="left">Min</td><td align="left">DVT in 1 patient</td><td char="." align="char">5.84</td><td align="left">NR</td></tr></tbody></table></table-wrap></p><p>Laparoscopic partial nephrectomy is a technical challenge to even the most experienced laparoscopic surgeons. The need to excise renal tissue while maintaining hemostasis, and the potential need to suture laparoscopically, has proven challenging. While many have been able to master the standard laparoscopic approach to partial nephrectomy, others have found it technically challenging. Robotic assistance has the potential to make learning easier and help the laparoscopic approach to partial nephrectomy become more widely accepted and utilized.</p><p>Robotic partial nephrectomy is still in its infancy and few series have been reported (Table <xref rid="Tab3" ref-type="table">3</xref>). Stifelman and colleagues [<xref ref-type="bibr" rid="CR6">6</xref>] recently reported their experience with robot-assisted laparoscopic partial nephrectomy (RALPN). Twelve RALPN were performed. Intraoperative hilar clamping was used in all cases. With the da Vinci system, the tumor was excised with cold scissors and biopsies were taken from the base. The kidney was then reconstructed and the defect was sutured with the robot, if necessary. For larger defects with more significant bleeding, a Surgicel bolster was laid in the defect and mattress sutures were placed before releasing the clamp. The mean operative time was 265 min, the mean warm ischemia time was 26 min, the mean tumor size was 1.8 cm, the mean estimated blood loss was 240 mL, the mean decrease in hematocrit was 6.5%, and the mean length of stay was 2.7 days. One patient developed a urine leak that was managed with a percutaneous drain for 5 weeks. Their conclusion was RALPN was safe, feasible, and reproducible.
<table-wrap id="Tab3"><label>Table 3</label><caption><p>Operative characteristics and outcomes of RALPN</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left">Investigators</th><th align="left">Patients</th><th align="left">Artery clamping</th><th align="left">OR time (min)</th><th align="left">Blood loss (mL)</th><th align="left">Warm ischemia time (min)</th><th align="left">Cold ischemia time (min)</th><th align="left">Hemostasis</th><th align="left">Remark</th><th align="left">Complications</th></tr></thead><tbody><tr><td align="left">Gettman [<xref ref-type="bibr" rid="CR76">76</xref>]</td><td align="left">13</td><td align="left">5</td><td align="left">215</td><td align="left">170</td><td align="left">22</td><td align="left">33</td><td align="left">Intracorporeal suturing</td><td align="left">Positive margin 1 patient</td><td align="left">Ileus 1 patient</td></tr><tr><td align="left">Phillips [<xref ref-type="bibr" rid="CR6">6</xref>]</td><td align="left">12</td><td align="left">12</td><td align="left"></td><td align="left"></td><td align="left"></td><td align="left"></td><td align="left">Gelfoam/fibrin glue and Intracorporeal suturing</td><td align="left">–</td><td align="left">Nil</td></tr><tr><td align="left">Pedraza [<xref ref-type="bibr" rid="CR77">77</xref>]</td><td align="left">1</td><td align="left">–</td><td align="left">440</td><td align="left">15</td><td align="left">–</td><td align="left">–</td><td align="left">Argon beam coagulator</td><td align="left">Bilatr.heminephroureterectomy</td><td align="left">Nil</td></tr><tr><td align="left">Caruso [<xref ref-type="bibr" rid="CR8">8</xref>]</td><td align="left">10</td><td align="left">10</td><td align="left">279</td><td align="left">240</td><td align="left">26.4</td><td align="left"></td><td align="left">Gelfoam/Surgicel bolster</td><td align="left">All patients with negative margins</td><td align="left">Bleeding after removal of vascular clamp</td></tr></tbody></table></table-wrap></p><p>Peschel and colleagues [<xref ref-type="bibr" rid="CR7">7</xref>] also reported their experience with 13 partial nephrectomies (12 purely robotic) with a mean lesion size of 3.5 cm. The mean warm ischemia time was 22 min and cold ischemia time ranged from 18 to 43 min. Mean estimated blood loss was 170 mL. Mean operating time was 215 min, ten cases had malignancies. No intraoperative complications were encountered. One patient experienced a post-operative ileus, which resolved spontaneously without adverse consequences. There was one positive margin which was treated with complete nephrectomy.</p><p>More recently Caruso et al. [<xref ref-type="bibr" rid="CR8">8</xref>] compared ten patients who underwent robot-assisted laparoscopic partial nephrectomy (RALPN) with ten patients who underwent conventional laparoscopic partial nephrectomy (LPN). Operative time, ischemia time, and EBL were similar for both groups. There were two intraoperative complications in the RALPN group. In one case bleeding after removal of the vascular clamps necessitated conversion to a hand-assisted approach. EBL was 300 mL and post-operative hematocrit was 31.7 mL dL<sup>−1</sup>. In the other case back bleeding and poor visualization required conversion to an open procedure. EBL was 500 mL and post-operative hematocrit was 34 mL dL<sup>−1</sup>. In the LPN group there was one conversion to open surgery for excessive back bleeding. All patients in the robotic group had negative margins. One patient in the laparoscopic group had a negative intraoperative margin but was found to have a positive margin on formal pathological review of the entire specimen.</p><p>From these studies it is clear that it is feasible to use robotic surgery to perform partial nephrectomy; its overall efficacy, utility and advantages over conventional surgery, however, are still unknown. It seems ischemia time, operative time, and blood loss are similar for the robotic and standard laparoscopic groups. Larger randomized series must be performed to determine whether the robotic system results in other advantages that were not detected in the small series that are currently available for review.</p></sec><sec id="Sec18"><title>Robot-assisted pyeloplasty</title><p>As laparoscopic pyeloplasty has evolved for treatment of UPJ obstruction, an increasing number of urologists have attempted to learn this operation. For novice laparoscopists learning is often quite difficult, because of the limitations of conventional laparoscopic surgery. The robot was initially looked upon as a tool to enable transition of surgeons from open to laparoscopic surgery. Studies soon showed, however, that the robot was not just a transition tool but in many ways was an improvement compared with standard laparoscopy, and with broader application.</p><p>The first robot-assisted pyeloplasty was described by Sung et al. [<xref ref-type="bibr" rid="CR9">9</xref>]. Their porcine model compared only the pyeloureteric anastomosis time and “tightness” of the anastomosis between traditional intracorporeal laparoscopic suturing and robot-assisted suturing. Use of the robot resulted in increased anastomosis times, but the “tightness” of the anastomosis was equal for two groups of pigs on visual inspection with indigo carmine and ex-vivo retrograde ureteropyelogram. The robot in this work was the Zeus robot with an Aesop attachment. Soon afterward this same group compared the Zeus and da Vinci robots for performing various laparoscopic procedures on the porcine model [<xref ref-type="bibr" rid="CR50">50</xref>]. They were able to perform the anastomosis faster and secure it with more bites by using the da Vinci system. Comparison of the two systems revealed the da Vinci robot was more technically intuitive to use, which made learning quicker.</p></sec><sec id="Sec19"><title>Clinical outcomes</title><p>The initial human series described the classical Anderson–Hynes [<xref ref-type="bibr" rid="CR51">51</xref>] dismembered pyeloplasty in nine patients using the da Vinci robot. Five of these patients underwent retrograde stent placement just before the operation and the other four had antegrade stents placed laparoscopically. They used three ports for the robot and one port for the assistant. Mean operative time was 138.8 min, mean suture time was 62.4 min, average blood loss was less than 50 mL in all cases, and mean hospital stay was 4.7 days. One patient required open exploration and repair for a persistent renal pelvis defect after pyeloplasty. Follow-up at 3 months was complete in five patients. All five patients had subjective and imaging proven improvement. The authors included neither radiological criteria for UPJ obstruction nor criteria for obstruction improvement. They proved, however, that robot pyeloplasty had the ability to emulate the open procedure similar to laparoscopic pyeloplasty (Table <xref rid="Tab4" ref-type="table">4</xref>).
<table-wrap id="Tab4"><label>Table 4</label><caption><p>Operative characteristics and outcomes of robot-assisted pyeloplasty</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left">Investigators</th><th align="left">Patients (<italic>N</italic>)</th><th align="left">OR time (min)</th><th align="left">Suturing time (min)</th><th align="left">Blood loss (mL)</th><th align="left">Hospital stay (days)</th><th align="left">Complications</th><th align="left">Success rate (%)</th><th align="left">Follow-up (months)</th></tr></thead><tbody><tr><td align="left">Bentas [<xref ref-type="bibr" rid="CR20">20</xref>]</td><td align="left">11</td><td align="left">197</td><td align="left">–</td><td align="left">50</td><td align="left">–</td><td align="left">Nil</td><td align="left">100</td><td align="left">12</td></tr><tr><td align="left">Gettman [<xref ref-type="bibr" rid="CR51">51</xref>]</td><td align="left">9</td><td align="left">138.3</td><td align="left">62.4</td><td align="left">50</td><td align="left">4.7</td><td align="left">Nil</td><td align="left">89, one patient required open surgery for repair of pelvic defect</td><td align="left">4.1</td></tr><tr><td align="left">Patel [<xref ref-type="bibr" rid="CR56">56</xref>]</td><td align="left">50</td><td align="left">122</td><td align="left">20</td><td align="left">40</td><td align="left">1.1</td><td align="left">Nil</td><td align="left">96</td><td align="left">11.7</td></tr><tr><td align="left">Palese [<xref ref-type="bibr" rid="CR55">55</xref>]</td><td align="left">38</td><td align="left">225.6</td><td align="left">64.2</td><td align="left">77.3</td><td align="left">2.8</td><td align="left">Nil</td><td align="left">94.7, two patients needed further therapy</td><td align="left">12.2</td></tr><tr><td align="left">Siddiq [<xref ref-type="bibr" rid="CR54">54</xref>]</td><td align="left">26</td><td align="left">245</td><td align="left">–</td><td align="left">69</td><td align="left">2</td><td align="left">Fever, urine leak</td><td align="left">95</td><td align="left">6</td></tr></tbody></table></table-wrap></p><p>Gettman et al. [<xref ref-type="bibr" rid="CR52">52</xref>] later compared robot pyeloplasty with standard laparoscopic pyeloplasty. Six patients in the robot group were compared with similar laparoscopic patients. Four patients underwent dismembered pyeloplasty and two underwent Fenger pyeloplasties. All patients were stented immediately before the operation. Mean operative time and suturing time was less for the robot pyeloplasties, but blood loss, hospital stay, and complications were similar. Suturing and operative time differences between robotic and standard laparoscopic pyeloplasty may have been even greater, because all standard laparoscopic procedures underwent extracorporeal tying rather than robotic intracorporeal tying. Short-term subjective and imaging results at 3 months were indicative of 100% success. They updated this series 2 years later with a total of 49 patients [<xref ref-type="bibr" rid="CR53">53</xref>]. Ten of these patients had initially failed endopyelotomy. Mean operative time was 124 min. Estimated blood loss was less than 50 mL. Follow-up for 41 of the 49 patients at a mean of 7.4 months revealed 100% success with diuretic renal scan or IVP.</p><p>After these early successes several other groups began reporting their experiences with robot-assisted laparoscopic pyeloplasty. Most of these groups performed a hybrid approach with initial dissection of the bowel, renal pelvis, and proximal ureter being performed using standard laparoscopic techniques and then use of the robot to perform the ureteropelvic anastomosis. Their short-term outcomes were similar with at least 94% success and minimal complications. The University of Miami reported results for 26 patients who underwent robot-assisted pyeloplasty [<xref ref-type="bibr" rid="CR54">54</xref>]. Of these patients, four had secondary UPJ obstruction. All patients had pre-operative retrograde ureteral stents placed. There were only three minor complications including post-operative fever, a urine leak managed conservatively, and an umbilical hernia. Follow-up with diuretic renal scan was performed 1 month after stent removal and then 6 months later. At 6 months follow-up subjective improvement was 95% and there was 100% success with diuretic renal scan.</p><p>At the same time, three medical centers in New York City released a collective study of their own robot pyeloplasty experience [<xref ref-type="bibr" rid="CR55">55</xref>]. The New York collective reported on 35 patients over 3 years, of whom two had a secondary UPJ obstruction. This group did not pre-operatively stent their patients because of their experience with excessive peri-ureteral edema and inflammation in the UPJ. This inflammation may increase the risk of anastomotic leaks and may cause the tissue to be more friable. Mean follow-up was 7.9 months and consisted of a diuretic renal scan at 3 months, then yearly. They reported an overall success rate of 94%.</p><p>The largest series of completely robot-assisted laparoscopic pyeloplasties with at least 11 months of follow-up was reported by Patel [<xref ref-type="bibr" rid="CR56">56</xref>]. Fifty patients all underwent Anderson–Hynes dismembered pyeloplasty (Fig. <xref rid="Fig5" ref-type="fig">5</xref>). Most patients were discharged on post-operative day one. Ureteral stents were removed at 3 weeks. Patency of the UPJ was followed by diuretic renal scan at 1 month, then every 3 months in the first year, then every 6 months for the second year, and then yearly. There were no complications, and blood loss was minimal in all cases. Forty-eight of fifty patients (96%) had both objective and subjective improvement.
<fig id="Fig5"><label>Fig. 5</label><caption><p>Robotic pyeloplasty patient positioning</p></caption><graphic xlink:href="11701_2006_3_Fig5_HTML" id="MO5"></graphic></fig></p></sec><sec id="Sec20"><title>Robotic cystectomy</title><p>In the last two years there has been increasing interest in laparoscopic radical cystectomy and, on the basis of published articles and abstracts, approximately 400 such operations have been performed throughout the world in different centers. These procedures are not free from complications, however—more so if diversion is performed totally intracorporeally [<xref ref-type="bibr" rid="CR57">57</xref>, <xref ref-type="bibr" rid="CR58">58</xref>].</p><p>Menon et al. [<xref ref-type="bibr" rid="CR59">59</xref>, <xref ref-type="bibr" rid="CR60">60</xref>], after acquiring substantial experience in robotic radical prostatectomy, are credited with expanding the horizon of robotic surgery into the field of bladder cancer.</p><p>Robotic radical cystectomy is a procedure which is currently in the developing phase. Most of the series (Table <xref rid="Tab5" ref-type="table">5</xref>) described in the literature use 5–6 ports and a surgical technique developed by Menon et al. [<xref ref-type="bibr" rid="CR59">59</xref>]. Around the same time, Beecken et al. [<xref ref-type="bibr" rid="CR61">61</xref>] described the possibility of intracorporeal reconstruction of orthotopic neobladder in a single case. Later, Balaji et al. [<xref ref-type="bibr" rid="CR62">62</xref>] described the possibility of intracorporeal reconstruction of the ileal conduit in a patient. Different series of RRC reported in the literature, with intraoperative, perioperative, and post-operative details, are listed in Table <xref rid="Tab5" ref-type="table">5</xref>.
<table-wrap id="Tab5"><label>Table 5</label><caption><p>Operative characteristics of robotic cystectomy</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left"></th><th align="left">Menon et al. [<xref ref-type="bibr" rid="CR59">59</xref>]</th><th align="left">Beecken et al. [<xref ref-type="bibr" rid="CR61">61</xref>]</th><th align="left">Menon et al. [<xref ref-type="bibr" rid="CR60">60</xref>]</th><th align="left">Hemal et al. [<xref ref-type="bibr" rid="CR58">58</xref>]</th><th align="left">Balaji et al. [<xref ref-type="bibr" rid="CR62">62</xref>]</th></tr></thead><tbody><tr><td align="left">Number of cases</td><td align="left">14 men</td><td align="left">1</td><td align="left">3</td><td align="left">24</td><td align="left">1</td></tr><tr><td align="left">Number of ports</td><td align="left">5–6</td><td align="left">Minilaparotomy, 5</td><td align="left">5–6</td><td align="left">5–6</td><td align="left">6</td></tr><tr><td align="left">Lymphadenectomy </td><td align="left">Bilateral extended pelvic lymphadenectomy</td><td align="left">Bilateral pelvic lymphadenectomy</td><td align="left">Bilateral extended pelvic lymphadenectomy </td><td align="left">Bilateral extended pelvic lymphadenectomy </td><td align="left"></td></tr><tr><td align="left">Operation time (min)</td><td align="left">RRC: 140<break></break>UD-120 (IC);168 (ONB)</td><td align="left">RRC + UD: 510</td><td align="left">RRC: 150, 160, 170<break></break>UD: 130, 190, 170</td><td align="left">RRC: 110 to 170<break></break>UD: 120 to 180</td><td align="left">828</td></tr><tr><td align="left">Blood loss (mL)</td><td align="left"><150</td><td align="left">200</td><td align="left">150, 250, 100</td><td align="left">100–300</td><td align="left">500 (decrease in Hb 5.3 g)</td></tr><tr><td align="left">Surgical margins</td><td align="left">Free from tumor infiltration</td><td align="left">Negative</td><td align="left">Negative</td><td align="left">Free from tumor infiltration</td><td align="left">Negative</td></tr><tr><td align="left">Urinary diversion</td><td align="left">Ileal Coduit: 2<break></break>W-pouch neobladder: 9<break></break>Double chimney: 2<break></break>T pouch: 1</td><td align="left">UD: Hautmann ileal neobladder<break></break>Midline incision was extended to exteriorized ileum for ileo-ileal anastomosis</td><td align="left">Ileal coduit: 1<break></break>W-pouch neobladder: 1<break></break>T pouch: 1</td><td align="left">Ileal coduit: 4<break></break>W-pouch neobladder: 16<break></break>Double chimney: 2<break></break>T pouch: 2</td><td align="left">Intracorporeal ileal conduit</td></tr><tr><td align="left">Intraoperative complications or conversion</td><td align="left">None</td><td align="left">None</td><td align="left">None</td><td align="left">None</td><td align="left">Ileus</td></tr></tbody></table></table-wrap></p><p>Although robotic radical cystectomy and extracorporeal urinary diversion are difficult procedures to perform, early experiences have shown promise for future innovation. The technique of RRCP has the potential to enable precise and rapid removal of the bladder with minimal blood loss and reduced morbidity. This approach has the advantages of minimally invasive and open surgery. Extracorporeal reconstruction of the urinary diversion requires less operative time at this stage of evolution of laparoscopic and robotic instrumentation.</p><p>The development of a technique for performing nerve-sparing robotic radical cystectomy using the da Vinci system is also beneficial for sexually active young patients and is easier to perform in males, because the prostate is benign in these patients. Initial urinary incontinence results show promise, because of excellent apical dissection, preservation of puboprostatic ligaments, sphincter urethrae, and a good urethral stump.</p><p>The challenge for the future is to continue to work to distinguish what can be done from what should be done, especially for bladder cancer, where two major components of surgery (extirpative surgery in the form of radical cystectomy and reconstructive surgery for urinary diversion) are mandatory. The long-term follow-up with cancer disease-free and overall survival are currently unknown. It is also important to have randomized series comparing robotic cystectomy with the best open surgery. In the future, with the development of technology, instrumentation, tissue engineering, absorbable endo-GIA bowel stapler, and further refinement of technique, it may be possible to perform the entire procedure completely intracorporeally with equal efficiency. The initial results look promising although the final determining factor will ultimately depend on long-term oncologic results.</p></sec><sec id="Sec21"><title>Robotic adrenalectomy</title><p>Laparoscopic adrenalectomy is now regarded as the preferred surgical approach for the management of benign adrenal disease. Despite the benefits of laparoscopic adrenalectomy, the procedure has shortcomings that are shared by other laparoscopic techniques. Commonly noted problems include the absence of 3D perception, minimal tactile feedback, reduced dexterity compared with open surgery and poor ergonomics for the surgeon (Table <xref rid="Tab6" ref-type="table">6</xref>).
<table-wrap id="Tab6"><label>Table 6</label><caption><p>Operative characteristics and outcomes of robot-assisted laparoscopic adrenalectomy</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left">Investigators</th><th align="left">Patients (<italic>N</italic>)</th><th align="left">OR time (min)</th><th align="left">Conversion rate (%)</th><th align="left">Complications</th><th align="left">Remark</th></tr></thead><tbody><tr><td align="left">Bentas [<xref ref-type="bibr" rid="CR78">78</xref>]</td><td align="left">4</td><td align="left"></td><td align="left">0</td><td align="left">Nil</td><td align="left">Technically feasible</td></tr><tr><td align="left">Desai [<xref ref-type="bibr" rid="CR79">79</xref>]</td><td align="left">2</td><td align="left">110–165</td><td align="left">0</td><td align="left">Nil</td><td align="left">Hospital stay was 2 and 3 days</td></tr><tr><td align="left">Brunaud [<xref ref-type="bibr" rid="CR80">80</xref>]</td><td align="left">14</td><td align="left">111</td><td align="left">7</td><td align="left">21% morbidity</td><td align="left">To continue further evaluation of robotic system</td></tr><tr><td align="left">Beninca [<xref ref-type="bibr" rid="CR81">81</xref>]</td><td align="left">9</td><td align="left">82.1</td><td align="left">44.4</td><td align="left">Nil</td><td align="left">High operative time and cost of the procedure</td></tr><tr><td align="left">Morino [<xref ref-type="bibr" rid="CR65">65</xref>]</td><td align="left">10</td><td align="left">169.2</td><td align="left">40</td><td align="left">20% morbidity</td><td align="left">–</td></tr></tbody></table></table-wrap></p><p>The da Vinci-assisted adrenalectomy was first reported in 2001 by Horgan et al. [<xref ref-type="bibr" rid="CR63">63</xref>] who described a total of 34 da Vinci-assisted laparoscopic cases. More recently Winter et al. [<xref ref-type="bibr" rid="CR64">64</xref>] described their experience of 30 robotic adrenalectomies. This is currently the largest series. Median operative time was 185 min and median hospital stay was 2 days. Surprisingly, hospital charges for robotic adrenalectomy ($12,977) were not significantly different from charges for traditional laparoscopic ($11,599) or open adrenalectomy ($14,600). In contrast Morino et al. [<xref ref-type="bibr" rid="CR65">65</xref>] randomized patients to a laparoscopic arm and a robotic arm when performing adrenalectomy. Operative times were significantly longer for the robot group; conversion to standard laparoscopy was necessary for four of ten robot patients. Finally, the total cost of the procedure was significantly higher than that for the laparoscopic group.</p><p>Agreement on the advantages of robotic adrenalectomy over laparoscopic adrenalectomy has yet to be reached.</p></sec><sec id="Sec22"><title>Urogynecology</title><p>There are few reports in the urogynecology and gynecology literature of results from the use of robotics. Robotics have been used to perform hysterectomies, for repair of vesicovaginal fistula, and for sacrocolpopexy. Transabdominal robotic sacrocolpexy has recently emerged as a new minimally invasive approach to the treatment of vaginal vault prolapse. Elliott et al. [<xref ref-type="bibr" rid="CR66">66</xref>] recently described their experience with 30 patients. Mean follow-up was 24 months, mean operative time was 3.1 h, and all but one patient went home on post-operative day one. One patient developed a grade 3 rectocele, one had a recurrent vault prolapse, and two had vaginal extrusion of mesh.</p><p>Vesicovaginal fistula (VVF) repair has also recently been completed with use of robotics. The first case of VVF repair using a laparoscopic approach with da Vinci robotic assistance was reported by the University of California, Irvine [<xref ref-type="bibr" rid="CR67">67</xref>]. In 2006, Sundaram et al. [<xref ref-type="bibr" rid="CR68">68</xref>] published data on VVF repair using robotics only. Fistula repair was successful in all cases, with a mean operative time of 233 min and estimated blood loss of less than 70 mL. The foley catheter was removed on the 10th post-operative day after voiding cystourethrography. At 6 months follow-up these patients continued to void normally without any recurrence of VVF.</p><p>Further long-term follow-up will be necessary to see if robotic assistance has technical advantages during complex laparoscopic female urologic procedures.</p></sec><sec id="Sec23"><title>Pediatric urology</title><p>Current procedures performed using robotics includes pyeloplasty, ureteral reimplantation, continent urinary diversions, and bladder augmentation. The 7-cm distance between the robotic ports may be difficult to achieve with children and infants. The recent introduction of 5 mm instruments has spurred significant interest in the development of robotic pediatric urology applications.</p><p>Yee et al. [<xref ref-type="bibr" rid="CR69">69</xref>] compared eight pediatric patients who underwent robot-assisted laparoscopic pyeloplasty with eight patients who underwent conventional open pyloplasty. A four-port transperitoneal technique was used to perform Anderson–Hynes pyeloplasty. The mean operative time and estimated blood loss was 363 min and 13.1 mL, respectively, in the robot-assisted group compared with 248 min and 53.8 mL in the open group. At a mean follow-up of 14.7 months, all robotic procedures were successful as determined by subjective data using pain scales and radiological data.</p><p>Peters et al. [<xref ref-type="bibr" rid="CR70">70</xref>] have also described extra-vesical Lich Gregoir and transvesical Cohens reimplantation. Twenty-one children underwent an unilateral ureteral reimplantation and three children underwent a bilateral ureteral reimplantation. Operative times ranged from 2 h for unilateral to 3 h for the bilateral procedure. At follow-up of just under 9 months 21 of the 27 patients had a satisfactory outcome [<xref ref-type="bibr" rid="CR70">70</xref>].</p><p>Pedraza et al. [<xref ref-type="bibr" rid="CR71">71</xref>] reported their case report with laparoscopic appendicovesicostomy using the da Vinci robotic system. The patient was a 7-year-old boy with a history of posterior urethral valves. A four port transperitoneal approach was used. Overall operative time was 6 h. Estimated blood loss was 10 mL. There were no intraoperative or post-operative complications. The patient was discharged home on post-operative day 4. During the procedure the utility of the robot was most helpful with the appendicovesical anastomosis. Use of the robot helped create a water-tight anastomosis and reduced the overall operative time of the procedure.</p><p>Miniaturization of robotic systems and instruments is expected to further encourage expansion of pediatric urologic applications.</p></sec><sec id="Sec24"><title>Other procedures</title><p>Robotic surgery has even entered the realm of microsurgery [<xref ref-type="bibr" rid="CR46">46</xref>]. Robot-assisted vasovasostomies have been performed in the rat model with 10–0 suture using a two layered technique. All anastomosis were patent, and all rabbits were free from crush injury [<xref ref-type="bibr" rid="CR72">72</xref>]. Similar to other studies, tremor is eliminated; clear visualization of microscopic details is available; and knot tying and suture placement is facilitated with the six degrees of freedom in movement and motion downscaling software. The mean operative time was longer for the robot-assisted vasovasostomy than for traditional microscopic vasovasostomy (75 and 42 min, respectively).</p><p>Schoor et al. [<xref ref-type="bibr" rid="CR73">73</xref>] devised a model vas deferens system using rat vasa deferentia and completed vasal anastomosis with full-thickness and mucosal robotically placed, Sharpoint 10–0 bicurve nylon sutures. Experienced and inexperienced microsurgeons performed separate anastomoses. Both groups of microsurgeons completed anastomoses with “accuracy and enhanced comfort”.</p><p>Although robot-assisted vasovasostomy is associated with increased operative times, the absence of adverse haptic events and comparable patency continue to suggest a possible role for robotics in microsurgery.</p></sec><sec id="Sec25"><title>Telepresence surgery</title><p>Telepresence surgery is defined as the ability to perform surgery remote from the patient’s bedside by application of robotic technology. Telepresence surgery and robotic telementoring are two revolutionary applications achieved by linking a robot to a telecommunication system. In telerobotic procedures, the surgeon operates from the surgeon’s console, which is a few feet or thousands of miles away from the slave robotic system. The introduction of robotics into the realm of laparoscopic surgery has given rise to significant interest in telepresence surgery. Electronic links using existing communication lines connect the remote surgeon to the robot and enable the surgeon to operate. The adoption of telepresence surgical capability has many potential implications. It would enable staff at centers of excellence to perform surgery at other institutions across the country and the world without leaving their centers. Telepresence surgical devices enable surgeons from remote sites to telementor surgeons still developing skills. The first major transatlantic surgery was a telerobotic cholecystectomy performed by surgeons in New York, NY, USA, on a patient in Strasbourg, France in 2001 [<xref ref-type="bibr" rid="CR32">32</xref>, <xref ref-type="bibr" rid="CR74">74</xref>].</p><p>Telepresence surgery raises a host of ethical dilemmas. Patient privacy, speed of transmission, and responsibility for the care of the patient are critical issues when dealing with a surgeon at the bedside and a surgeon operating from a remote location and will need to be addressed before incorporation of this technology [<xref ref-type="bibr" rid="CR63">63</xref>].</p></sec><sec id="Sec26"><title>The future</title><p>Robotic technology has undoubtedly revolutionized the way many surgical procedures are performed today and will be performed in the future. Over the last five years we have taken the unique advantages of the da Vinci system and used them to make urologic surgery more refined.</p><p>Additional technical modifications of robotic systems may increase the effectiveness of robotic surgery. One important issue is the use of smaller instruments. In the latest version of the da Vinci system there is the addition of 5-mm instruments, use of the fourth arm and a new vision system, which enables switching between the three-dimensional close-up view to a more wide-angle view [<xref ref-type="bibr" rid="CR63">63</xref>].</p><p>Other potential topics of research include use of miniaturized motors to reduce the size of the robotic tower, evaluating the potential for mounting the robotic tower on the ceiling or wall to increase access points to the patient, and real-time or non-real time image integration into the endoscopic view on the console. Image integration would enable the surgeon to operate on the target organ and evaluate blood supply by use of real-time ultrasound, or identify a lesion by integrating magnetic resonance imaging (MRI)/CT images into the operative image (personal communication with Intuitive Surgical).</p><p>From an educational perspective, significant research is currently in progress to produce a mentoring system. This system would enable an attending surgeon to have control over the “masters” if problems should arise during a case performed by a resident/fellow. Research on robotic simulators is also being conducted. Robotic simulators are, potentially, a safe learning environment enabling objective and reliable quantification of skill levels by trainers [<xref ref-type="bibr" rid="CR63">63</xref>].</p></sec><sec id="Sec27" sec-type="conclusion"><title>Conclusion</title><p>There has been exponential growth in the use of robotic technology in urology during the last decade. Because prostate cancer is the most prevalent male cancer in the United States, robotic prostatectomy has grown as a minimally invasive alternative to open prostatectomy. The technology has been especially useful for procedures requiring intricate suturing or maneuverability in small spaces, for example pyeloplasty and prostatectomy. As the number of robotic systems and surgeon experience increase, adaptation of robotic procedures will undoubtedly increase in number with decreasing operative times. 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