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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Newer concepts in neural anatomy and neurovascular preservation in robotic radical prostatectomy</title><author><name sortKey="Pisipati, Sailaja" sort="Pisipati, Sailaja" uniqKey="Pisipati S" first="Sailaja" last="Pisipati">Sailaja Pisipati</name><affiliation><nlm:aff id="aff1">Department of Urology, Icahn School of Medicine, Mount Sinai Hospital, New York, NY 10029, USA</nlm:aff></affiliation></author><author><name sortKey="Ali, Adnan" sort="Ali, Adnan" uniqKey="Ali A" first="Adnan" last="Ali">Adnan Ali</name><affiliation><nlm:aff id="aff1">Department of Urology, Icahn School of Medicine, Mount Sinai Hospital, New York, NY 10029, USA</nlm:aff></affiliation></author><author><name sortKey="Mandalapu, Rao S" sort="Mandalapu, Rao S" uniqKey="Mandalapu R" first="Rao S." last="Mandalapu">Rao S. Mandalapu</name><affiliation><nlm:aff id="aff1">Department of Urology, Icahn School of Medicine, Mount Sinai Hospital, New York, NY 10029, USA</nlm:aff></affiliation></author><author><name sortKey="Haines Iii, George K" sort="Haines Iii, George K" uniqKey="Haines Iii G" first="George K." last="Haines Iii">George K. Haines Iii</name><affiliation><nlm:aff id="aff2">Department of Pathology, Icahn School of Medicine, Mount Sinai Hospital, New York, NY 10029, USA</nlm:aff></affiliation></author><author><name sortKey="Singhal, Paras" sort="Singhal, Paras" uniqKey="Singhal P" first="Paras" last="Singhal">Paras Singhal</name><affiliation><nlm:aff id="aff1">Department of Urology, Icahn School of Medicine, Mount Sinai Hospital, New York, NY 10029, USA</nlm:aff></affiliation></author><author><name sortKey="Reddy, Balaji N" sort="Reddy, Balaji N" uniqKey="Reddy B" first="Balaji N." last="Reddy">Balaji N. Reddy</name><affiliation><nlm:aff id="aff1">Department of Urology, Icahn School of Medicine, Mount Sinai Hospital, New York, NY 10029, USA</nlm:aff></affiliation></author><author><name sortKey="Leung, Robert" sort="Leung, Robert" uniqKey="Leung R" first="Robert" last="Leung">Robert Leung</name><affiliation><nlm:aff id="aff1">Department of Urology, Icahn School of Medicine, Mount Sinai Hospital, New York, NY 10029, USA</nlm:aff></affiliation></author><author><name sortKey="Tewari, Ashutosh K" sort="Tewari, Ashutosh K" uniqKey="Tewari A" first="Ashutosh K." last="Tewari">Ashutosh K. Tewari</name><affiliation><nlm:aff id="aff1">Department of Urology, Icahn School of Medicine, Mount Sinai Hospital, New York, NY 10029, USA</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">25378822</idno><idno type="pmc">4220380</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4220380</idno><idno type="RBID">PMC:4220380</idno><idno type="doi">10.4103/0970-1591.142064</idno><date when="2014">2014</date><idno type="wicri:Area/Pmc/Corpus">000207</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000207</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Newer concepts in neural anatomy and neurovascular preservation in robotic radical prostatectomy</title><author><name sortKey="Pisipati, Sailaja" sort="Pisipati, Sailaja" uniqKey="Pisipati S" first="Sailaja" last="Pisipati">Sailaja Pisipati</name><affiliation><nlm:aff id="aff1">Department of Urology, Icahn School of Medicine, Mount Sinai Hospital, New York, NY 10029, USA</nlm:aff></affiliation></author><author><name sortKey="Ali, Adnan" sort="Ali, Adnan" uniqKey="Ali A" first="Adnan" last="Ali">Adnan Ali</name><affiliation><nlm:aff id="aff1">Department of Urology, Icahn School of Medicine, Mount Sinai Hospital, New York, NY 10029, USA</nlm:aff></affiliation></author><author><name sortKey="Mandalapu, Rao S" sort="Mandalapu, Rao S" uniqKey="Mandalapu R" first="Rao S." last="Mandalapu">Rao S. Mandalapu</name><affiliation><nlm:aff id="aff1">Department of Urology, Icahn School of Medicine, Mount Sinai Hospital, New York, NY 10029, USA</nlm:aff></affiliation></author><author><name sortKey="Haines Iii, George K" sort="Haines Iii, George K" uniqKey="Haines Iii G" first="George K." last="Haines Iii">George K. Haines Iii</name><affiliation><nlm:aff id="aff2">Department of Pathology, Icahn School of Medicine, Mount Sinai Hospital, New York, NY 10029, USA</nlm:aff></affiliation></author><author><name sortKey="Singhal, Paras" sort="Singhal, Paras" uniqKey="Singhal P" first="Paras" last="Singhal">Paras Singhal</name><affiliation><nlm:aff id="aff1">Department of Urology, Icahn School of Medicine, Mount Sinai Hospital, New York, NY 10029, USA</nlm:aff></affiliation></author><author><name sortKey="Reddy, Balaji N" sort="Reddy, Balaji N" uniqKey="Reddy B" first="Balaji N." last="Reddy">Balaji N. Reddy</name><affiliation><nlm:aff id="aff1">Department of Urology, Icahn School of Medicine, Mount Sinai Hospital, New York, NY 10029, USA</nlm:aff></affiliation></author><author><name sortKey="Leung, Robert" sort="Leung, Robert" uniqKey="Leung R" first="Robert" last="Leung">Robert Leung</name><affiliation><nlm:aff id="aff1">Department of Urology, Icahn School of Medicine, Mount Sinai Hospital, New York, NY 10029, USA</nlm:aff></affiliation></author><author><name sortKey="Tewari, Ashutosh K" sort="Tewari, Ashutosh K" uniqKey="Tewari A" first="Ashutosh K." last="Tewari">Ashutosh K. Tewari</name><affiliation><nlm:aff id="aff1">Department of Urology, Icahn School of Medicine, Mount Sinai Hospital, New York, NY 10029, USA</nlm:aff></affiliation></author></analytic><series><title level="j">Indian Journal of Urology : IJU : Journal of the Urological Society of India</title><idno type="ISSN">0970-1591</idno><idno type="eISSN">1998-3824</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>With more than 60% of radical prostatectomies being performed robotically, robotic-assisted laparoscopic prostatectomy (RALP) has largely replaced the open and laparoscopic approaches and has become the standard of care surgical treatment option for localized prostate cancer in the United States. Accomplishing negative surgical margins while preserving functional outcomes of sexual function and continence play a significant role in determining the success of surgical intervention, particularly since the advent of nerve-sparing (NS) robotic prostatectomy. Recent evidence suggests that NS surgery improves continence in addition to sexual function. In this review, we describe the neuroanatomical concepts and recent developments in the NS technique of RALP with a view to improving the “trifecta” outcomes.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Noldus, J" uniqKey="Noldus J">J Noldus</name></author><author><name sortKey="Graefen, M" uniqKey="Graefen M">M Graefen</name></author><author><name sortKey="Haese, A" uniqKey="Haese A">A Haese</name></author><author><name sortKey="Henke, Rp" uniqKey="Henke R">RP Henke</name></author><author><name sortKey="Hammerer, P" uniqKey="Hammerer P">P Hammerer</name></author><author><name sortKey="Huland, H" uniqKey="Huland H">H Huland</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Magheli, A" uniqKey="Magheli A">A Magheli</name></author><author><name sortKey="Burnett, Al" uniqKey="Burnett A">AL Burnett</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Ficarra, V" 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Indian J Urol</journal-id><journal-id journal-id-type="iso-abbrev">Indian J Urol</journal-id><journal-id journal-id-type="publisher-id">IJU</journal-id><journal-title-group><journal-title>Indian Journal of Urology : IJU : Journal of the Urological Society of India</journal-title></journal-title-group><issn pub-type="ppub">0970-1591</issn><issn pub-type="epub">1998-3824</issn><publisher><publisher-name>Medknow Publications & Media Pvt Ltd</publisher-name><publisher-loc>India</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">25378822</article-id><article-id pub-id-type="pmc">4220380</article-id><article-id pub-id-type="publisher-id">IJU-30-399</article-id><article-id pub-id-type="doi">10.4103/0970-1591.142064</article-id><article-categories><subj-group subj-group-type="heading"><subject>Symposium</subject></subj-group></article-categories><title-group><article-title>Newer concepts in neural anatomy and neurovascular preservation in robotic radical prostatectomy</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Pisipati</surname><given-names>Sailaja</given-names></name><xref ref-type="aff" rid="aff1"></xref></contrib><contrib contrib-type="author"><name><surname>Ali</surname><given-names>Adnan</given-names></name><xref ref-type="aff" rid="aff1"></xref></contrib><contrib contrib-type="author"><name><surname>Mandalapu</surname><given-names>Rao S.</given-names></name><xref ref-type="aff" rid="aff1"></xref></contrib><contrib contrib-type="author"><name><surname>Haines III</surname><given-names>George K.</given-names></name><xref ref-type="aff" rid="aff2">1</xref></contrib><contrib contrib-type="author"><name><surname>Singhal</surname><given-names>Paras</given-names></name><xref ref-type="aff" rid="aff1"></xref></contrib><contrib contrib-type="author"><name><surname>Reddy</surname><given-names>Balaji N.</given-names></name><xref ref-type="aff" rid="aff1"></xref></contrib><contrib contrib-type="author"><name><surname>Leung</surname><given-names>Robert</given-names></name><xref ref-type="aff" rid="aff1"></xref></contrib><contrib contrib-type="author"><name><surname>Tewari</surname><given-names>Ashutosh K.</given-names></name><xref ref-type="aff" rid="aff1"></xref><xref ref-type="corresp" rid="cor1"></xref></contrib></contrib-group><aff id="aff1">Department of Urology, Icahn School of Medicine, Mount Sinai Hospital, New York, NY 10029, USA</aff><aff id="aff2"><label>1</label>Department of Pathology, Icahn School of Medicine, Mount Sinai Hospital, New York, NY 10029, USA</aff><author-notes><corresp id="cor1"><bold>For correspondence:</bold> Dr. Ashutosh K. Tewari, Department of Urology, The Carroll and Milton Petrie Foundation, Icahn School of Medicine at Mount Sinai, 1425 Madison Avenue, L6-50, New York, NY 10029, USA. E-mail: <email xlink:href="ashtewari@mountsinai.org">ashtewari@mountsinai.org</email></corresp></author-notes><pub-date pub-type="ppub"><season>Oct-Dec</season><year>2014</year></pub-date><volume>30</volume><issue>4</issue><fpage>399</fpage><lpage>409</lpage><permissions><copyright-statement>Copyright: © Indian Journal of Urology</copyright-statement><copyright-year>2014</copyright-year><license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by-nc-sa/3.0"><license-p>This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</license-p></license></permissions><abstract><p>With more than 60% of radical prostatectomies being performed robotically, robotic-assisted laparoscopic prostatectomy (RALP) has largely replaced the open and laparoscopic approaches and has become the standard of care surgical treatment option for localized prostate cancer in the United States. Accomplishing negative surgical margins while preserving functional outcomes of sexual function and continence play a significant role in determining the success of surgical intervention, particularly since the advent of nerve-sparing (NS) robotic prostatectomy. Recent evidence suggests that NS surgery improves continence in addition to sexual function. In this review, we describe the neuroanatomical concepts and recent developments in the NS technique of RALP with a view to improving the “trifecta” outcomes.</p></abstract><kwd-group><kwd>Prostatic neuroanatomy</kwd><kwd>nerve sparing</kwd><kwd>robotic assisted laparoscopic prostatectomy</kwd></kwd-group></article-meta></front><body><sec sec-type="intro" id="sec1-1"><title>INTRODUCTION</title><p>The introduction of prostate-specific antigen (PSA) screening over the last two decades has resulted in stage migration of prostate cancer.[<xref rid="ref1" ref-type="bibr">1</xref>] Radical prostatectomy (RP) for organ-confined prostate cancer is an effective treatment option but can result in erectile dysfunction (ED) and incontinence in a significant proportion of patients. The reported rates of post-operative potency vary widely from 21% to 86%.[<xref rid="ref2" ref-type="bibr">2</xref>] The prevalence of urinary incontinence following RALP ranges from 4% to 31%.[<xref rid="ref3" ref-type="bibr">3</xref>] With an increasing number of men being diagnosed at a younger age, achieving the “trifecta goals” is of utmost importance to improving the quality of life. Accomplishing negative surgical margins while preserving functional outcomes of sexual function and continence plays a significant role in determining the success of surgical intervention, particularly since the advent of nerve sparing (NS) RP. With more than 60% of RP being performed robotically, robot-assisted laparoscopic prostatectomy (RALP) has largely replaced the standard open radical prostatectomy (ORP) and laparoscopic radical prostatectomy (LRP) as a surgical treatment option for prostate cancer.[<xref rid="ref4" ref-type="bibr">4</xref>] A meta-analysis by Tewari <italic>et al</italic>. in 2012 has demonstrated that margin rates are comparable between RALP and ORP, with LRP demonstrating an increased risk for positive surgical margins (PSM). The meta-analysis also revealed that the robotic approach is the safest in terms of perioperative complications.[<xref rid="ref5" ref-type="bibr">5</xref>] Recent evidence suggests that NS not only improves sexual function but also enhances continence recovery.[<xref rid="ref6" ref-type="bibr">6</xref><xref rid="ref7" ref-type="bibr">7</xref>] It is in the pursuit of these improved oncological outcomes along with preservation of sexual function and continence that RALP can have the greatest impact. In this review, we describe the neuroanatomical concepts and recent developments in the NS technique of RALP with a view to improving the “trifecta” outcomes.</p><sec id="sec2-1"><title></title><sec id="sec3-1"><title>Prostatic neuro-anatomy re-visited</title><p>The pioneering contributions of Walsh <italic>et al</italic>. in 1982 on the anatomic dissection for preservation of the neurovascular bundles (NVBs) remains one of the most significant landmarks in urological history.[<xref rid="ref8" ref-type="bibr">8</xref>] It is well known that autonomic nerves contribute to penile erection. The inferior hypogastric plexus, comprised of the sympathetic fibers from T11-L2 ganglia and the parasympathetics from the ventral rami of S2-S4 spinal nerves, sends efferents to the pelvic viscera. The parasympathetics from this plexus situated behind the rectum travel past the seminal vesicles and along the posterolateral aspect of the prostate and descend posterior and lateral to the urethra before they penetrate the urogenital diaphragm to continue posterior to the dorsal penile artery.[<xref rid="ref8" ref-type="bibr">8</xref>] Because of the reversal of steps of RP with the robotic approach and the advantages of RALP that include seven degrees of freedom, improved ergonomics and three-dimensional vision, the anatomical foundations of the neuronal architecture were re-visited by Tewari <italic>et al</italic>.[<xref rid="ref9" ref-type="bibr">9</xref>] The course of the NVBs from its origin in the pelvic plexus down to its course along the urethra using the minimally invasive approach was studied using cadaveric models.[<xref rid="ref9" ref-type="bibr">9</xref>] The NVBs were found to be situated typically in an anterolateral location, but were found to occupy the posterolateral aspect on rare occasions.[<xref rid="ref10" ref-type="bibr">10</xref><xref rid="ref11" ref-type="bibr">11</xref>] Tewari <italic>et al</italic>. described that this network of interconnecting neural fibers around the prostate and seminal vesicles was arranged as a hammock in a trizonal distribution.[<xref rid="ref12" ref-type="bibr">12</xref>] Takenaka <italic>et al</italic>. described the fan-like distribution of the parasympathetic fibers lying about 2 cm distal to the prostato–vesical junction on the posterolateral aspect of the prostate.[<xref rid="ref13" ref-type="bibr">13</xref>] Takenaka and Tewari <italic>et al</italic>. have also demonstrated the presence and the distribution of the autonomic ganglion cells in the pelvic plexus and around the bladder and the prostate.[<xref rid="ref9" ref-type="bibr">9</xref><xref rid="ref14" ref-type="bibr">14</xref>] Additionally, the NVBs were found to be occupying a potential avascular triangular space bounded by the anterior layer of the Denonvillier's fascia posteriorly, prostatic fascia medially and the lateral pelvic fascia laterally.[<xref rid="ref9" ref-type="bibr">9</xref>] Additional erectile nerves in the “Veil of Aphrodite” along the anterolateral aspect of the prostate were identified by Menon and colleagues.[<xref rid="ref11" ref-type="bibr">11</xref>] Costello <italic>et al</italic>. identified that the array of nerve fibers coursing along the posterolateral aspect of the prostate inferior to the tip of the seminal vesicles formed a more well-defined bundle at the mid-prostatic position before re-diverging near the apex.[<xref rid="ref15" ref-type="bibr">15</xref>] According to another report, a reasonable amount of nerves were identified on the ventral aspect of the prostate in addition to the classical posterolateral location.[<xref rid="ref16" ref-type="bibr">16</xref>]</p><p>Trizonal neural architecture</p><p>The “trizonal” neural architecture is comprised of the proximal neurovascular plate (PNP), predominant neurovascular bundle (PNB) and accessory neural pathways (ANP) arranged around the prostate as a neural hammock [<xref ref-type="fig" rid="F1">Figure 1</xref>].[<xref rid="ref12" ref-type="bibr">12</xref><xref rid="ref13" ref-type="bibr">13</xref>]</p><fig id="F1" position="float"><label>Figure 1</label><caption><p>The trizonal neural network comprising of the proximal neurovascular plate (PNP), the predominant neurovascular bundles (PNB) and accessory neural pathways (ANP) form a neural hammock around the prostate. Medical animation representing the neural hammock</p></caption><graphic xlink:href="IJU-30-399-g001"></graphic></fig><p>The PNP is situated lateral to the bladder neck and seminal vesicles (SV) and is intermingled with branches of the inferior vesical vasculature. It is located 5 mm lateral to the SV, within 6 mm of the bladder neck, 5 mm of the endopelvic fascia and overlaps 5 mm of the prostate. It measures 3 mm thick, 7 mm wide and 9 mm long. It is the integrating center for the processing and relaying of erectogenic neural impulses and is prone to injury during incision of the endopelvic fascia, incision of the prostate-vesical junction, lateral dissection of the SV, application of a bulldog clamp and division of prostatic pedicles.[<xref rid="ref12" ref-type="bibr">12</xref>]</p><p>Enclosed within the layers of the levator fascia and/or lateral pelvic fascia and within the groove between the prostate and the rectum lies the PNB, which carries neural impulses to the erectile tissue and exhibits a variable course, shape and size. The PNB was thickest at the base, and was most variable in course and architecture near the apex. In 66% of the cases, a medial extension was noted behind the prostate, which converged medially at the apex in 33% of the cases. The ganglion cells in the PNB are attached to the prostatic capsule or embedded within the capsule; hence, the need for cautious, athermal dissection to avoid injury.[<xref rid="ref12" ref-type="bibr">12</xref>] PNBs are prone to injury during the dissection of endopelvic fascia, controlling the pedicles, during release of NVBs, apical transection and urethral anastomosis.</p><p>ANPs are putative accessory neural pathways within the layers of levator and/or lateral pelvic fascia, on the anterolateral (42%) and occasionally on the posterolateral aspect of the prostate (25%). ANPs may be damaged during dissection of the endopelvic fascia, suturing the dorsal venous complex while applying back-bleeding suture during posterior dissection, controlling the pedicle, release of NVBs, during apical transection or while performing urethral anastomosis.[<xref rid="ref12" ref-type="bibr">12</xref>]</p><p>The steps of RALP during which each of these trizonal neural structures are likely to be injured and the preventive measures to be taken to avoid such injury have been previously described by Tewari <italic>et al</italic>.[<xref rid="ref12" ref-type="bibr">12</xref>] Establishing a clear anatomical map of the neurovascular structures related to RALP has empowered surgeons with the knowledge to enhance their NS technique, which is crucial for functional recovery.</p></sec><sec id="sec3-2"><title>Techniques to preserve NVB</title><p>The majority of the fibers of the NVBs lie in between the prostatic fascia (medial layer of the lateral pelvic fascia) and the levator fascia (lateral layer of the lateral pelvic fascia). The venous/vascular layer acts as a landmark during NS surgery. Various terminologies have been coined to describe the incisions through the planes around the prostate during NS RALP.</p><p>The veil of Aphrodite technique proposed by Menon involves anterior incision of the prostatic fascia to enter the plane between the prostatic capsule and the prostatic fascia. This follows the posterior and the posterolateral dissection in the plane between the prostatic fascia and the Denonvillier's fascia. The periprostatic tissue hanging from the bladder neck down toward the urethro–apical junction is known as the “Veil of Aphrodite.”[<xref rid="ref17" ref-type="bibr">17</xref>] The technique was refined in 2009, in which the anterior prostatic fascial tissue, adherent to the capsule, dorsal venous complex and the pubovesical ligaments, was preserved. Adopting this modification known as the “superveil” technique, it was believed that the nerves interposed between the 11-o’ clock and the 1-o’ clock positions were preserved.[<xref rid="ref18" ref-type="bibr">18</xref>]</p><p>Another conventional nomenclature used for the NS approach is the intrafascial, intrafascial and extrafascial approach [<xref ref-type="table" rid="T1">Table 1</xref>]. However, this classification system is slowly being replaced by the graded NS approach.</p><table-wrap id="T1" position="float"><label>Table 1</label><caption><p>Intrafascial, interfascial and extrafascial approach</p></caption><graphic xlink:href="IJU-30-399-g002"></graphic></table-wrap><p>We now routinely adopt the athermal, traction-free, risk-stratified graded NS approach described below to optimize our oncological and functional outcomes.</p><p>Athermal technique</p><p>Various modifications have been made to the technique of NS RALP over the last decade. In an attempt to minimize thermal and ischemic damage to the delicate neurovascular tissues, Tewari <italic>et al</italic>. introduced the concept of “Athermal Robotic technique” (ART) in 2005.[<xref rid="ref19" ref-type="bibr">19</xref>] Based on the understanding of the trizonal neural anatomy and by adopting the ART, 45% sexual function was achieved at 6 weeks.[<xref rid="ref20" ref-type="bibr">20</xref>] Technical feasibility of the athermal technique has been proven even in large prostates.[<xref rid="ref21" ref-type="bibr">21</xref>] In a study of 215 patients who had RALP, 87% of those who had bilateral NS, are <70 years and were pre-operatively potent, were potent at 1 year following surgery. The overall PSM rate was 6.5%.[<xref rid="ref22" ref-type="bibr">22</xref>]</p><p>In a study comparing monopolar cautery, bipolar cautery and a cautery-free technique, Ahlering <italic>et al</italic>. noticed nearly a five-fold improvement of potency recovery at 3 and 9 months with the cautery-free approach.[<xref rid="ref23" ref-type="bibr">23</xref>] A cumulative analysis of eight studies in a systematic review by Ficarra <italic>et al</italic>. revealed better potency outcomes with the athermal NS technique at 3, 6 and 12 months.[<xref rid="ref24" ref-type="bibr">24</xref>] It is hence believed that avoiding/minimizing thermal energy, particularly while dissecting the NVBs, results in better functional outcomes.</p><p>Traction-Free technique</p><p>Another modification adopted to the NS technique is a traction-free approach.[<xref rid="ref19" ref-type="bibr">19</xref>] Undue stretch on the NVB causes mechanical trauma resulting in axonotemesis and disruption of the vasa nervorum thus resulting in neural and vascular insults. In addition, tissue hypoxia can result due to injury to the accessory pudendal arteries that run along the anterolateral surface of the bladder and the prostate in 70% of the cases.[<xref rid="ref25" ref-type="bibr">25</xref>] Such vascular insults account for hypoxia, nutrient deficiency, free radical formation and accumulation of neurotoxic elements that result in ischemia and delayed recovery. It is hypothesized that reducing or avoiding traction on the NVB minimizes the chances of stretch-induced axonotemesis and tissue hypoxia thus resulting in better functional outcomes. The lack of tactile feedback in robotic surgery poses a challenge in detecting excessive traction placed on the neurovasculature during the procedure. In an attempt to overcome this drawback, Tewari <italic>et al</italic>. developed the concept of real-time intraoperative penile oxygenation monitoring as a surrogate for identifying traction. This involved the use of an auditory probe that provided feedback in the form of an alarm when the tissue oxygenation dropped below 85%. Subtle, deliberate modifications to certain steps during the procedure, based on this auditory feedback, resulted in maintenance of penile oxygenation at or above 85% during the surgery.[<xref rid="ref26" ref-type="bibr">26</xref>] Using this device, Tewari <italic>et al</italic>. reported that a significantly higher proportion of patients with bilateral NS in the study group had no ED when compared with the control group at 6 and 52 weeks post-RALP. 93.9% and 78.4% of patients in the study and control groups, respectively, had a SHIM score ≥17 at 1 year. The overall PSM rates in the study and control groups were 9.4% and 9.9%, respectively. Feedback obtained by real-time tissue oxygen monitoring has allowed subtle technical adjustments thus amounting to improved functional outcomes.</p><p>Risk-stratified graded NS</p><p>The concept of graded NS approach to improve sexual outcomes was introduced in 2008.[<xref rid="ref27" ref-type="bibr">27</xref>] In an attempt to balance the competing goals of oncological cure and sexual recovery, a “novel” risk stratification strategy has been proposed[<xref rid="ref28" ref-type="bibr">28</xref><xref rid="ref29" ref-type="bibr">29</xref>] [Figures <xref ref-type="fig" rid="F2">2</xref>–<xref ref-type="fig" rid="F4">4</xref>] [<xref ref-type="table" rid="T2">Table 2</xref>]. Based on several pre-operative parameters including PSA, clinical stage, Gleason grade on biopsy and pre-operative magnetic resonance imaging (MRI) findings, patients are categorized into one of four risk grades, where risk grade 1 patients receive NS grade 1 and so on for risk grades 2-4. By adopting this risk-stratified approach for neural hammock preservation during RALP, Tewari <italic>et al</italic>. were able to improve potency outcomes without compromising oncological outcomes in a cohort of 1263 patients. The authors reported higher rates of intercourse (90.9% and 62% for grades 1 and 4 NS, respectively) and return to baseline sexual function (81.7% and 54.4% for grades 1 and 4, respectively) in patients who had greater degrees (lower grades) of NS. The overall PSM rates for patients with NS grades 1, 2, 3 and 4 were 9.9%, 8.1%, 7.2% and 8.7%, respectively (<italic>P</italic> = 0.64). With increasing degree of NS, PSM rates were not significantly elevated; potency outcomes, however, were significantly better.[<xref rid="ref30" ref-type="bibr">30</xref>]</p><fig id="F2" position="float"><label>Figure 2</label><caption><p>Planes of dissection for nerve sparing grades 1–4. (a) Medical animation. (b) Diagrammatic representation of the layers of fascia enveloping the prostatic capsule, showing the planes of dissection. LPF = lateral pelvic fascia medial layer, i.e., prostatic fascia; LF = lateral pelvic fascia lateral layer, i.e., levator fascia; LA = levator ani. B – Reproduced with permission from [<xref rid="ref24" ref-type="bibr">24</xref>]</p></caption><graphic xlink:href="IJU-30-399-g003"></graphic></fig><fig id="F3" position="float"><label>Figure 3</label><caption><p>Risk stratification algorithm for athermal nerve sparing robotic radical prostatectomy. (ECE = extracapsular extension; mp MRI = multiparametric magnetic resonance imaging)</p></caption><graphic xlink:href="IJU-30-399-g004"></graphic></fig><fig id="F4" position="float"><label>Figure 4</label><caption><p>Pre-operative multiparametric magnetic resonance imaging in risk stratification and intraoperative planning for graded nerve spare, intraoperative views and corresponding histology from the edge for Grade 1 (a,b,c), Grade 2 (d, e, f), Grade 3 (g, h, i) and Grade 4 (j, k, l) nerve spare. (c – capsule; bv – blood vessel; f – periprostatic fat; n – nerve bundle). The red arrow in J points to the site of extracapsular extension</p></caption><graphic xlink:href="IJU-30-399-g005"></graphic></fig><table-wrap id="T2" position="float"><label>Table 2</label><caption><p>Grades of nerve sparing robotic radical prostatectomy</p></caption><graphic xlink:href="IJU-30-399-g006"></graphic></table-wrap><p>Schatloff <italic>et al</italic> described a five-point NS grading system based on intraoperative visual cues. According to their system, a non-NS procedure was assigned grade 1 and the best NS (≥95%) was graded as 5, with <50%, 50% and 75% NS being coded as grades 2, 3 and 4, respectively.[<xref rid="ref31" ref-type="bibr">31</xref>] According to a subjective model of a four-point NS score (NSS) grading system proposed by Moskovic <italic>et al</italic>., where NSS 1 meant complete preservation (i.e. full NS) and 4 was complete resection (i.e. non-NS), a lower NSS was one of the independent predictors of sexual function recovery at 24 months.[<xref rid="ref32" ref-type="bibr">32</xref>]</p><p>Available data support the fact that cavernosal preservation during RALP is no longer an “all or none” phenomenon, but is a graded entity. The grading system enables the surgeon to achieve better “trifecta” outcomes.</p><p>Intra-operative frozen sections</p><p>RP involves interplay between competing goals of cancer extirpation, NS, post-operative recovery of urinary continence and potency. This requires precise dissection in an appropriate plane to achieve effective cancer control by avoiding PSMs and performing adequate NS concurrently. At present, there is no consensus on the use of frozen sections during RP. Various studies have gauged the utility of intraoperative frozen section analysis performed at different sites of the prostate/periprostatic soft tissue, and the results vary widely. This variation is mostly due to differences in sampling methods (sites or whole margins) and sites. Neurovascular structure–adjacent frozen section examination (NeuroSAFE) technique of intraoperative frozen section (IFS) analysis allows real-time histological evaluation and helps in performing a NS procedure without compromising oncological safety. Schlomm <italic>et al</italic>. demonstrated in a cohort of 11,069 patients a feasible intraoperative technique of NeuroSAFE.[<xref rid="ref33" ref-type="bibr">33</xref>] This technique enables real-time histologic monitoring of the oncologic safety of an NS procedure. Systematic NeuroSAFE was reported to significantly increase NS frequency and reduces PSMs. Also, patients with a NeuroSAFE-detected PSM were converted to a prognostically more favorable NSM status by secondary wide resection. In this study, a false-negative IFS result was reported in 2.5% of the cases. In this context, our group is currently developing an MRI-guided intraoperative frozen section technique [<xref ref-type="fig" rid="F5">Figure 5</xref>]. The preliminary results will be available in the near future.</p><fig id="F5" position="float"><label>Figure 5</label><caption><p>Magnetic resonance imaging (MRI)-guided intraoperative frozen section. (a) T2-weighted MRI and (b) diffusion-weighted imaging (DWI) demonstrating a left-sided lesion (marked in green). (c,d) A radical prostatectomy specimen (P) with left lateral margin transected for intraoperative frozen section (left true margin marked in blue, false left margin in yellow inked as red at the apex). (e) Intraoperative frozen section from the left margin (blue and yellow represent true and false margins, respectively). (B = base; A = apex; SV = seminal vesicles)</p></caption><graphic xlink:href="IJU-30-399-g007"></graphic></fig></sec><sec id="sec3-3"><title>Imaging and nerve mapping techniques to identify the NVB</title><p>Localization by imaging modalities</p><p>Infiltration of the neoplastic cells around the cavernosal nerve fibers and extraprostatic extension are microscopic phenomena that cannot be visualized intraoperatively even with the ×10-12 magnification of the stereoscope of the daVinci system. The inability to identify malignant cells and their association with nerves can result in incomplete removal of the cancerous tissue resulting in PSM, post-operative impotence due to damage to/excision of the cavernous nerves or a combination of both. In order to maintain the delicate balance between oncological control and preserving functional outcomes, it is crucial for the surgeon to be able to identify and better define the NVB in relation to the prostate in real-time. Optical magnification with surgical loupes, intraoperative nerve stimulation and real-time robotic transrectal ultrasound (TRUS Robot) have been attempted.</p><p>Diffusion tensor magnetic resonance imaging (DTI)</p><p>DTI is an emerging technology to facilitate treatment planning. It is based on the sensitivity of the water protons measured in the microstructural environment.[<xref rid="ref34" ref-type="bibr">34</xref>] The main quantitative measurements of DTI include average diffusivity and fractional anisotropy.[<xref rid="ref35" ref-type="bibr">35</xref>] DTI, currently used for neuroimaging applications, enables tracing of the periprostatic nerves. Its utility in human prostates was first reported by Sinha in 2004.[<xref rid="ref36" ref-type="bibr">36</xref>] In a recent study using DTI along with mp MRI, the authors demonstrated that of DTI, 2D-T2-weighted MRI and 3D-T2-weighted MRI, only DTI fiber tracking allowed assessment of the entire periprostatic nervous plexus and of all the fibers bilaterally at all levels in all the 33 patients included in the study. The authors concluded that this information could be useful for guiding proper NS surgery using an intrafascial or extrafascial robotic approach[<xref rid="ref37" ref-type="bibr">37</xref>] or even the graded NS approach, thereby ensuring recovery of erectile function after RP. <xref ref-type="fig" rid="F6">Figure 6</xref> depicts the fiber tracts from an <italic>ex vivo</italic> robotic radical prostatectomy specimen using high-resolution DTI. DTI seems to have a promising role in the future for NVB preservation during RP.</p><fig id="F6" position="float"><label>Figure 6</label><caption><p><italic>Ex vivo</italic> diffusion tensor magnetic resonance imaging obtained from robotic radical prostatectomy specimen. The various colors represent the fibers in and around the prostate</p></caption><graphic xlink:href="IJU-30-399-g008"></graphic></fig><p>Multi-photon microscopy (MPM)</p><p>Access to high-resolution real-time imaging of the prostatic capsule, apex, sphincter and the surrounding neurovascular structures is likely to improve oncological and functional outcomes. MPM is one such novel optical imaging technology that relies on the simultaneous absorption of two or three low-energy (near-infrared) photons to cause a non-linear excitation, which reduces the potential for cellular damage.[<xref rid="ref38" ref-type="bibr">38</xref>] By adopting a stepwise approach for imaging, researchers were able to identify the cavernous nerve, major pelvic ganglion, prostatic capsule, prostatic acini, fat, vessels and pathological changes in rat models and <italic>ex vivo</italic> human prostatectomy specimens[<xref rid="ref38" ref-type="bibr">38</xref><xref rid="ref39" ref-type="bibr">39</xref>] [<xref ref-type="fig" rid="F7">Figure 7</xref>]. “Real-time tissue imaging” may help surgeons to localize the nerves in relation to the cancerous tissues and potentially identify possible perineural invasion and extraprostatic extension in real time. This would then minimize nerve damage thus enhancing sexual outcomes and reduce the incidence of PSM. Like most technological innovations, MPM imaging will have to face several potential challenges before it can be integrated into real-time applications.</p><fig id="F7" position="float"><label>Figure 7</label><caption><p>Multi-photon microscopy (MPM) images from ex vivo human prostate. (a,b) Lateral pelvic fascia showing a large artery (a), fibrocollagenous connective tissue stroma (s) and fat (c) on MPM image (A) and histology slide (B). Note the empty lumen of the artery in A and B. (c) Surgical apical margin showing a small nerve (arrow). Small arrowhead points to collagen and the large arrowhead points to elastin in the connective tissue stroma. (d) Surgical apical margin showing a small artery. Note the empty lumen (arrow) as opposed to the wavy nerve fibers in C and E. (e) Higher magnification image of a small nerve bundle at the surgical margin showing fluorescence that derives from the axoplasm or cytoplasm of the Schwann cells. (f) Prostatic capsule showing an underlying prostatic acinus (pa), capsule (c), periprostatic connective tissue (s) and fat (f). (g,h) Higher magnification of prostatic acini imaged using three detector channels. Cells emit mostly in the 420-530 nm range and thus appear green in the color-coding scheme. By contrast, the gland-associated punctate fluorescence (which could represent lipofuscin deposits) emits over a broader wavelength range and thus appears blue in the color-coding scheme (arrows point to bona fide cells with distinct nuclei). Color-coding of MPM images: Red, second harmonic generation (SHG) (355-420 nm); green, short-wavelength autofluorescence (420-530 nm); blue, long-wavelength autofluorescence (530-650 nm). Scale bars: A, C, D, H 500 μm; E 67 μm; F, G 100 μm [Reproduced and edited with permission from 31]</p></caption><graphic xlink:href="IJU-30-399-g009"></graphic></fig><p>Optical coherence tomography (OCT)</p><p>OCT provides real-time, high-resolution, cross-sectional tissue imaging by measuring the back scatter near-infrared radiation. It is non-invasive and the energy utilized does not cause mechanical damage. Given its fiberoptic nature delivery system, portability and low cost, it can readily be integrated into endoscopic/laparoscopic surgical equipment and probes. The drawback, however, is the inadequate resolution quality for tissues >1 mm deep. Using OCT, the cavernous nerve was distinguished as an intense linear structure separate from the adjacent tissues in <italic>in vivo</italic> experiments on Sprague–Dawley rats; however, the discrimination between adjacent prostatic tissues and nerves was not adequate in <italic>ex vivo</italic> human prostatectomy specimens.[<xref rid="ref40" ref-type="bibr">40</xref>] In a feasibility study by Dangle <italic>et al</italic>., in which OCT was used on 100 <italic>ex vivo</italic> human prostatectomy specimens to identify PSM and extraprostatic extension (EPE), the results were compared against the gold standard histopathology. The reported sensitivity and specificity for PSM were 70% and 84%, respectively, with 33% and 96% positive predictive value (PPV) and negative predictive value (NPV). The sensitivity, specificity, PPV and NPV for EPE and SV invasion (SVI) were 46%, 84%, 50%, 92% and 33%, 97%, 33% and 97%, respectively. This study established the template for the visual OCT characteristics of the prostate, SV and cancerous tissue. With its high NPV, OCT could be useful to rule out PSM, EPE and SVI.[<xref rid="ref41" ref-type="bibr">41</xref>] In vivo studies are needed to prove its efficacy in real-time imaging intraoperatively. Beuvon <italic>et al</italic>. have recently tested the feasibility of OCT in prostate biopsies for diagnostic purposes and reported a 81% concordance with histopathological findings.[<xref rid="ref42" ref-type="bibr">42</xref>] OCT might have a potential role in the future both in the diagnostic and the therapeutic pathways.</p><p>Localization by physiological stimulation</p><p>A number of nerve mapping technologies have been investigated to aid in localization of periprostatic nerves for augmenting NS during radical prostatectomy. Mapping is usually performed by stimulating a nerve either by optical or by electrical means and then detecting a physiologic response, such as penile tumescence/detumescence, intracavernosal pressure, intraurethral pressure, impedance or an action potential. Examples of such devices include CaverMap,[<xref rid="ref43" ref-type="bibr">43</xref>] ProPep, NIMEclipse and optical nerve monitoring. <xref ref-type="table" rid="T3">Table 3</xref> describes the currently available nerve stimulation devices.</p><table-wrap id="T3" position="float"><label>Table 3</label><caption><p>Characteristics of the nerve stimulation devices</p></caption><graphic xlink:href="IJU-30-399-g010"></graphic></table-wrap><p>Dye-based visualization</p><p>Nerves can be stained using fluorescent dyes and can be identified based on specific characteristics such as the method of delivery, nerve specificity, time for staining and resolution. When applied directly by local infiltration into the base of the penis, these dyes travel via the retrograde transport mechanism along the erectile nerves. Systemic administration of the dye results in labeling of all or most of the nerves, and hence the labeled nerves may not be responsible for erectile function. Local injections have a limited utility as well, as they label only one nerve fiber tract at a time. In addition, axonal transport is a slow process and can take a long time, sometimes up to several months. Currently, indocyanine green and fluorescein are the only FDA-approved dyes that have been studied in RP. Other examples of nerve dyes include compounds from Avelas and General Electric, fluorescent cholera toxin subunit B, indocyanine green, fluorescent-inactivated herpes simplex 2 and Fluoro-Gold.[<xref rid="ref48" ref-type="bibr">48</xref>]</p><p>Neurovascular bundle reconstruction</p><p>Wide excision of the NVBs is a prudent approach followed by most surgeons when there is a high index of suspicion of ECE and NVB invasion by tumor based on pre-operative parameters. However, there is no consensus on the ideal method for NVB reconstruction. While there are a few existing options to choose from, namely sural nerve grafting,[<xref rid="ref49" ref-type="bibr">49</xref>] use of embryonic stem cells or growth factors to enhance neural regeneration,[<xref rid="ref50" ref-type="bibr">50</xref>] entubulization model of cavernosal nerve[<xref rid="ref51" ref-type="bibr">51</xref>] or nerve advancement with end-to-end reconstruction,[<xref rid="ref52" ref-type="bibr">52</xref>] none of them are employed routinely.</p><p>Nerve advancement technique (NAT) is one such technique based on neuroscientific concepts of peripheral nerve repair that attempts to establish continuity between the proximal and distal nerve stumps by end-to-end anastomosis of the partially resected NVB [<xref ref-type="fig" rid="F8">Figure 8</xref>]. Geuna <italic>et al</italic>. and Terzis <italic>et al</italic>. reported that if continuity is restored by end-to-end suturing, bands of Bungner arise from axons upstream of the point of transection and grow along the glial columns in the distal nerve stump to eventually re-innervate the denervated structures.[<xref rid="ref53" ref-type="bibr">53</xref><xref rid="ref54" ref-type="bibr">54</xref>] Tewari <italic>et al</italic>. performed nerve advancement and end-to-end, tension-free anastomosis of the proximal and distal neural stumps following partial resection of NVBs in a pilot study of seven pre-operatively potent, high-risk patients. One patient had a PSM and five of the seven men regained potency. They reported that NAT is technically feasible, oncologically safe and is associated with promising sexual outcomes.[<xref rid="ref52" ref-type="bibr">52</xref>]</p><fig id="F8" position="float"><label>Figure 8</label><caption><p>Nerve advancement technique (NAT). (a) Black arrow heads mark the location of partially resected neurovascular bundle. (b) Black arrow heads mark the approximated ends of neurovascular bundles using the nerve advancement technique (NAT)</p></caption><graphic xlink:href="IJU-30-399-g011"></graphic></fig></sec></sec></sec><sec sec-type="conclusion" id="sec1-2"><title>CONCLUSION</title><p>Much of the success achieved in the last decade in terms of improved trifecta outcomes following robotic radical prostatectomy relates to the adoption of an athermal, traction-free, risk-stratified, graded nerve spare approach to preserve the neural hammock. Innovative techniques to incorporate real-time intraoperative imaging and nerve mapping methodologies to identify and preserve the cavernosal nerves seem to have a challenging but promising role in the future.</p></sec></body><back><ack><title>ACKNOWLEDGMENTS</title><p>The authors are thankful to Dr. Bachir Taouli MD, Dr. Cheuk Ying Tang PhD, Dr. Victoria Wang PhD and Dr. Edmund Wong PhD, from the Department of Radiology, Icahn School of Medicine, for providing the <italic>ex vivo</italic> image for diffusion tensor imaging.</p></ack><fn-group><fn fn-type="supported-by"><p><bold>Source of Support:</bold> Nil</p></fn><fn fn-type="conflict"><p><bold>Conflict of Interest:</bold> Dr. Ashutosh Tewari discloses that he is the principal investigator on research grants from Intuitive Surgical, Inc. (Sunnyvale, CA, USA) and Boston Scientific Corporation; he is a non-compensated director of the Prostate Cancer Institute (Pune, India) and Global Prostate Cancer Research Foundation; he has received research funding from the Prostate Cancer Foundation, The LeFrak Family Foundation, Mr. and Mrs. Paul Kanavos, Craig Effron & Company, Charles Evans Foundation and Christian and Heidi Lange Family Foundation. 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