Review of Current Laser Therapies for the Treatment of Benign Prostatic Hyperplasia
Identifieur interne : 000423 ( Pmc/Corpus ); précédent : 000422; suivant : 000424Review of Current Laser Therapies for the Treatment of Benign Prostatic Hyperplasia
Auteurs : E. Charles Osterberg ; Benjamin B. ChoiSource :
- Korean Journal of Urology [ 2005-6737 ] ; 2013.
Abstract
The gold standard for symptomatic relief of bladder outlet obstruction secondary to benign prostatic hyperplasia has traditionally been a transurethral resection of the prostate (TURP). Over the past decade, however, novel laser technologies that rival the conventional TURP have multiplied. As part of the ongoing quest to minimize complications, shorten hospitalization, improve resection time, and most importantly reduce mortality, laser prostatectomy has continually evolved. Today, there are more variations of laser prostatectomy, each with several differing surgical techniques. Although abundant data are available confirming the safety and feasibility of the various laser systems, future randomized-controlled trials will be necessary to verify which technique is superior. In this review, we describe the most common modalities used to perform a laser prostatectomy, mainly, the holmium laser and the potassium-titanyl-phosphate lasers. We also highlight the physical and clinical characteristics of each technology with a review of the most current and highest-quality literature.
Url:
DOI: 10.4111/kju.2013.54.6.351
PubMed: 23789041
PubMed Central: 3685632
Links to Exploration step
PMC:3685632Le document en format XML
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Review of Current Laser Therapies for the Treatment of Benign Prostatic Hyperplasia</title>
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<front><div type="abstract" xml:lang="en"><p>The gold standard for symptomatic relief of bladder outlet obstruction secondary to benign prostatic hyperplasia has traditionally been a transurethral resection of the prostate (TURP). Over the past decade, however, novel laser technologies that rival the conventional TURP have multiplied. As part of the ongoing quest to minimize complications, shorten hospitalization, improve resection time, and most importantly reduce mortality, laser prostatectomy has continually evolved. Today, there are more variations of laser prostatectomy, each with several differing surgical techniques. Although abundant data are available confirming the safety and feasibility of the various laser systems, future randomized-controlled trials will be necessary to verify which technique is superior. In this review, we describe the most common modalities used to perform a laser prostatectomy, mainly, the holmium laser and the potassium-titanyl-phosphate lasers. We also highlight the physical and clinical characteristics of each technology with a review of the most current and highest-quality literature.</p>
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<pmc article-type="review-article"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Korean J Urol</journal-id>
<journal-id journal-id-type="iso-abbrev">Korean J Urol</journal-id>
<journal-id journal-id-type="publisher-id">KJU</journal-id>
<journal-title-group><journal-title>Korean Journal of Urology</journal-title>
</journal-title-group>
<issn pub-type="ppub">2005-6737</issn>
<issn pub-type="epub">2005-6745</issn>
<publisher><publisher-name>The Korean Urological Association</publisher-name>
</publisher>
</journal-meta>
<article-meta><article-id pub-id-type="pmid">23789041</article-id>
<article-id pub-id-type="pmc">3685632</article-id>
<article-id pub-id-type="doi">10.4111/kju.2013.54.6.351</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Review Article</subject>
</subj-group>
</article-categories>
<title-group><article-title>Review of Current Laser Therapies for the Treatment of Benign Prostatic Hyperplasia</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" corresp="yes"><name><surname>Osterberg</surname>
<given-names>E. Charles</given-names>
</name>
<xref ref-type="aff" rid="A1"></xref>
</contrib>
<contrib contrib-type="author"><name><surname>Choi</surname>
<given-names>Benjamin B.</given-names>
</name>
<xref ref-type="aff" rid="A1"></xref>
</contrib>
</contrib-group>
<aff id="A1">Department of Urology, Weill-Cornell Medical Center, New York, NY, USA.</aff>
<author-notes><corresp>Corresponding Author: E. Charles Osterberg. Department of Urology, Weill-Cornell Medical Center, Starr 900, 525 E. 68th St, New York, NY 10065, USA. TEL: +1-212-746-5455, FAX: +1-212-746-8207, <email>charlesosterberg@gmail.com</email>
</corresp>
</author-notes>
<pub-date pub-type="ppub"><month>6</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub"><day>12</day>
<month>6</month>
<year>2013</year>
</pub-date>
<volume>54</volume>
<issue>6</issue>
<fpage>351</fpage>
<lpage>358</lpage>
<history><date date-type="received"><day>15</day>
<month>4</month>
<year>2013</year>
</date>
<date date-type="accepted"><day>20</day>
<month>5</month>
<year>2013</year>
</date>
</history>
<permissions><copyright-statement>© The Korean Urological Association, 2013</copyright-statement>
<copyright-year>2013</copyright-year>
<license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by-nc/3.0/"><license-p>This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by-nc/3.0/">http://creativecommons.org/licenses/by-nc/3.0/</ext-link>
) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.</license-p>
</license>
</permissions>
<abstract><p>The gold standard for symptomatic relief of bladder outlet obstruction secondary to benign prostatic hyperplasia has traditionally been a transurethral resection of the prostate (TURP). Over the past decade, however, novel laser technologies that rival the conventional TURP have multiplied. As part of the ongoing quest to minimize complications, shorten hospitalization, improve resection time, and most importantly reduce mortality, laser prostatectomy has continually evolved. Today, there are more variations of laser prostatectomy, each with several differing surgical techniques. Although abundant data are available confirming the safety and feasibility of the various laser systems, future randomized-controlled trials will be necessary to verify which technique is superior. In this review, we describe the most common modalities used to perform a laser prostatectomy, mainly, the holmium laser and the potassium-titanyl-phosphate lasers. We also highlight the physical and clinical characteristics of each technology with a review of the most current and highest-quality literature.</p>
</abstract>
<kwd-group><kwd>Laser surgery</kwd>
<kwd>Lower urinary tract symptoms</kwd>
<kwd>Prostatic hyperplasia</kwd>
<kwd>Transurethral prostatectom</kwd>
</kwd-group>
</article-meta>
</front>
<body><sec><title>INTRODUCTION</title>
<p>Over the past decade, medical professionals have seen a tremendous growth of lasers used in the treatment of both benign and malignant conditions. Specifically, urologists have witnessed a paradigm shift away from the conventional monopolar transurethral resection of the prostate (TURP) for the treatment of symptomatic bladder outlet obstruction (BOO) toward newer technologies with improved safety yet comparable durability. It is universally accepted that monopolar TURP carries several complications and side effects, including bleeding, fluid absorption, and postoperative electrolyte imbalances. To improve on the pitfalls of conventional TURP, lasers have been used to treat BOO secondary to benign prostatic hyperplasia (BPH). Laser prostatectomy has several advantages over standard TURP, including minimal fluid absorption, technical simplicity, minimal bleeding, and in some cases a shorter duration of hospitalization. Owing to the hemostatic profile of some lasers, laser prostatectomy can even be safely performed in men receiving therapeutic anticoagulation. As such, newer, safer, yet more powerful iterations of various laser fibers continue to evolve, giving the practicing urologist a full armamentarium of laser fibers. In this review, we highlight the variety of lasers currently used to treat BOO and their optical characteristics, which result in differing clinical outcomes.</p>
</sec>
<sec><title>TYPES OF LASERS USED FOR BOO</title>
<p>A host of laser fibers and systems are used to treat BOO. Many of these laser systems use combinations of differing wavelengths to achieve their characteristic properties. The following is a summary of the commercially available lasers used by urologists [<xref ref-type="bibr" rid="B1">1</xref>
]:</p>
<p><list list-type="simple"><list-item><p>Coagulative laser: neodymium: yttrium-aluminiumgarnet (Nd:YAG), diode laser</p>
</list-item>
<list-item><p>Cutting laser: holmium:YAG (Ho:YAG) and thulium: YAG (Tm:YAG)</p>
</list-item>
<list-item><p>Vaporizing laser: Nd:YAG, Ho:YAG, diode, KTP (potassium-titanyl-phosphate), and lithium triborate (LBO)</p>
</list-item>
</list>
</p>
<p>Below we summarize the physical properties and clinical outcomes of some of the most widely used laser systems.</p>
</sec>
<sec><title>Nd:YAG LASER</title>
<p>One of the first laser systems developed for ablation of prostate adenoma in a procedure later termed "visual ablation of the prostate" (VLAP) is the Nd:YAG laser. This laser emits a 1064-nm wavelength, which is poorly absorbed by water and penetrates deeply into prostatic tissues. In the prostatic tissue, it is converted into thermal energy leading to coagulation, which is one of the system's proposed benefits [<xref ref-type="bibr" rid="B2">2</xref>
]. Initial results with the Nd:YAG laser were promising.</p>
<p>In a nonrandomized trial of VLAP versus conventional TURP, Uchida et al. [<xref ref-type="bibr" rid="B3">3</xref>
] found that men treated with VLAP had similar clinical outcomes despite lower morbidity rates. One of the largest, multi-institutional randomized trials demonstrated that VLAP required less operative time and resulted in shorter hospitalizations, less bleeding, and lower morbidity than did TURP. However, TURP conferred significant and durable improvements in all urinary metrics over VLAP [<xref ref-type="bibr" rid="B4">4</xref>
].</p>
<p>In a more recent multicenter randomized trial, Donovan et al. [<xref ref-type="bibr" rid="B5">5</xref>
] compared the Nd:YAG laser with standard TURP in more than 200 men. The authors again found TURP to be superior in all primary outcomes in addition to having longer catheterization times compared with the Nd:YAG laser.</p>
<p>Ultimately, the popularity of VLAP fell as patients complained of persistent dysuria despite relief of their outlet obstruction, which was likely a result of the dispersive thermal coagulation effect of this laser [<xref ref-type="bibr" rid="B2">2</xref>
].</p>
</sec>
<sec><title>Ho:YAG LASER</title>
<p>The Ho:YAG laser was first introduced in 1995 by Gilling et al. [<xref ref-type="bibr" rid="B6">6</xref>
]. This laser emits a 2140-nm wavelength with a depth of penetration less than the Nd:YAG laser of roughly 500 microns [<xref ref-type="bibr" rid="B2">2</xref>
]. Because this laser is rapidly absorbed by water, it requires contact with the prostate tissue for vaporization to occur, which is a major difference from the KTP laser. The laser system is currently available at a power of up to 100 W. The Ho:YAG laser is also commonly used for the treatment of bladder stones, ureter stones, and upper tract urothelial carcinoma, thus making it extremely versatile. For BOO secondary to BPH, there are two main surgical techniques described that use the holmium laser, each with supportive data.</p>
<sec><title>1. Holmium laser ablation of the prostate</title>
<p>This technique, first introduced in 1995, used the 60-W side-firing Ho:YAG laser to ablate the prostate adenoma in a systematic fashion [<xref ref-type="bibr" rid="B6">6</xref>
]. Since this time, holmium laser ablation of the prostate (HoLAP) has been evaluated to a lesser degree than its counterpart holmium laser enucleation of the prostate (HoLEP). Whereas HoLAP can ablate prostate tissue effectively while achieving hemostasis, the duration of ablation required to remove large amounts of prostate adenoma was reported to be tedious and costly [<xref ref-type="bibr" rid="B7">7</xref>
]. Nevertheless, HoLAP has undergone rigorous evaluation.</p>
<p>In a randomized comparison between TURP and HoLAP, Mottet et al. [<xref ref-type="bibr" rid="B8">8</xref>
] reported the procedure to require more operative time (75 minutes vs. 56 minutes); however, it had a shorter catheterization time with equal improvements in patients' International Prostate Symptom Score (IPSS) and maximal urinary flow rate (Qmax). In one of the longest durations of clinical follow-up, Tan et al. [<xref ref-type="bibr" rid="B9">9</xref>
] found that HoLAP provided durable improvements in urinary metrics up to 7 years postoperatively; however, 15% of men underwent a repeat transurethral procedure. In men with prostate sizes greater than 80 mL, Kumar [<xref ref-type="bibr" rid="B10">10</xref>
] published data showing HoLAP to be efficacious and feasible with a mean lasing time of 77 minutes. In a comparative trial of HoLAP versus photoselective vaporization of the prostate (PVP), Elzayat et al. [<xref ref-type="bibr" rid="B11">11</xref>
] reported in a prospective randomized trial of 109 men that HoLAP required more operative time (70 minutes vs. 56 minutes).</p>
<p>Today, the 100-W laser system is currently advisable as a safe alternative for smaller prostate glands [<xref ref-type="bibr" rid="B7">7</xref>
]. Barski et al. [<xref ref-type="bibr" rid="B12">12</xref>
] reported the most contemporary series of 144 men with a mean prostate volume of 40 mL by TRUS undergoing 80- to 100-W HoLAP. Their mean operative time was 50 minutes with significant improvements in all urinary metrics; however, men with prostate sizes greater than 40 mL had a reoperation rate of 25%. HoLAP has even been utilized in a "fast-track" ambulatory surgery setting whereby 65 men were discharged directly home with catheters in place. Jumper et al. [<xref ref-type="bibr" rid="B13">13</xref>
] report there were no readmissions and minimal morbidity within 90 days.</p>
</sec>
<sec><title>2. Holmium laser enucleation of the prostate</title>
<p>In an effort to speed operative time while mimicking the principles of a standard TURP resection, a modification of the ablative technique was first described by Gilling et al. [<xref ref-type="bibr" rid="B6">6</xref>
] in 1996 and later by Mackey et al. [<xref ref-type="bibr" rid="B14">14</xref>
] in 1998. Using the laser, the resectionist makes perpendicular incisions in the lateral lobes of the prostate adenoma off the prostatic capsule and later evacuates the prostate chips by means of a morcellator or evacuator. The median lobe is then enucleated back to the verumontanum [<xref ref-type="bibr" rid="B15">15</xref>
]. This technique allows for retrieval of prostate chips for pathologic tissue analysis.</p>
<p>These reported benefits have generated rigorous evaluations into the safety, efficacy, and durability of HoLEP. Gilling et al. [<xref ref-type="bibr" rid="B16">16</xref>
] reported on 6-year follow-up data for 71 men after HoLEP. This retrospective review represents perhaps the longest experience of HoLEP and demonstrates a satisfaction rate of 92% with durable improvements in urinary metrics.</p>
<p>For men with large prostates, HoLEP was proven suitable in two trials comparing HoLEP with open simple prostatectomy. Naspro et al. [<xref ref-type="bibr" rid="B17">17</xref>
] randomly assigned 80 men with prostates greater than 70 mL on TRUS and found that whereas simple prostatectomy had a shorter operative time, the men who underwent HoLEP had less bleeding, a lower number of blood transfusions, a shorter catheterization time, and a shorter length of hospitalization. At 24 months, the urodynamic and uroflowmetry findings were equal among the groups. In a similar study with a 5-year follow-up of men with prostate sizes greater than 100 mL, Kuntz et al. [<xref ref-type="bibr" rid="B18">18</xref>
] found equally good results with no statistically significant difference in reoperation rates.</p>
<p>HoLEP has also been reported to be safe in men receiving anticoagulation mediation. Elzayat et al. [<xref ref-type="bibr" rid="B19">19</xref>
] enrolled 83 men receiving chronic oral anticoagulation therapy with a mean prostate size by TRUS of 82.4 mL for HoLEP. The authors reported that one patient required intraoperative platelets and 7 men required postoperative blood transfusions; however, there were no major postoperative adverse events or thromboembolic events.</p>
<p>Many comparative trials of the HoLEP technique versus TURP have been performed [<xref ref-type="bibr" rid="B20">20</xref>
-<xref ref-type="bibr" rid="B22">22</xref>
]. In one of the first multicenter, prospective randomized trials, Montorsi et al. [<xref ref-type="bibr" rid="B23">23</xref>
] enrolled 100 men with symptomatic BOO. With routine 1-year follow-up, the authors reported equal urodynamic findings and subjective symptom scoring between the HoLEP and TURP groups. The men who underwent HoLEP had a longer operative time but shorter catheter times and hospital lengths of stay. Complications were similar among the groups. In another randomized trial comparing HoLEP with TURP, Ahyai et al. [<xref ref-type="bibr" rid="B24">24</xref>
] found durable improvements in all urinary metrics at 3 years, but the reduction in the postvoid residual (PVR) was significantly improved in the HoLEP cohort. There were no significant differences in late complication rates of urethral strictures, bladder neck contractures, or need for reoperation. In a comparison of the impact of each surgical technique on erectile function, both HoLEP and TURP equally lowered responses on the orgasmic domain of the International Index of Erectile Function questionnaire [<xref ref-type="bibr" rid="B25">25</xref>
].</p>
<p>Critics of HoLEP report that the procedure is technically challenging and requires at least 20 to 50 cases to gain surgical proficiency [<xref ref-type="bibr" rid="B2">2</xref>
]. The addition of prostatic chip extraction via morcellator adds surgical risk with potential bladder perforations or bladder mucosal injuries being reported [<xref ref-type="bibr" rid="B26">26</xref>
]. Nevertheless, the holmium laser has been thrust into mainstream use internationally, and despite being technically challenging, HoLEP has been shown to rival the conventional TURP.</p>
</sec>
</sec>
<sec><title>KTP AND 532-nm WAVELENGTH LASERS</title>
<p>Recent advances in laser technologies have allowed for continuous evolution of the KTP lasers. This family of lasers has a 532-nm wavelength that is selectively absorbed by hemoglobin and acts as an intracellular chromophore. Energy is absorbed through a water-based medium into the hemoglobin molecules of the prostate, where it is rapidly heated and causes vaporization of tissue and bubble formation. These unique properties of the 532-nm KTP laser allow excellent vaporization while achieving hemostasis with a 1- to 2-mm rim of photocoagulation. As such, the term "photoselective vaporization of the prostate" was coined [<xref ref-type="bibr" rid="B27">27</xref>
].</p>
<sec><title>1. 60-W KTP LASER</title>
<p>The first <italic>in vivo</italic>
report of the 532-nm KTP 60-W laser was in 1998 by Malek et al. [<xref ref-type="bibr" rid="B28">28</xref>
]. The original prototype was studied in 10 men with BOO with a mean prostate volume of 38.4±9.7 mL. In all 10 men, Foley catheters were removed within 24 hours and maximal urinary flow was significantly improved. Since this time, numerous studies have been performed evaluating the safety, efficacy, and durability of the 60-W KTP laser. Larger trials performed in 2000 with a 2-year duration of follow-up corroborated the initial findings and moreover demonstrated improvements in American Urological Association Symptom Score (AUASS), Qmax, and PVR [<xref ref-type="bibr" rid="B29">29</xref>
].</p>
</sec>
<sec><title>2. 80-W KTP LASER</title>
<p>While the initial studies of the 60-W KTP laser were promising, perhaps the biggest criticism was a lack of efficient vaporization. To address this, the 80-W KTP laser was introduced to increase the lasing power to accommodate faster tissue ablation. To preserve the 1- to 2-mm coagulation zone, a pulsing technology was incorporated that confines the lasing energy solely to the superficial tissues, which is termed "thermal confinement" [<xref ref-type="bibr" rid="B2">2</xref>
].</p>
<p>The first <italic>in vivo</italic>
human experiments with the 80-W KTP laser demonstrated durable improvements over 1 year in AUASS, Qmax, PVR, and quality of life (QoL) scores [<xref ref-type="bibr" rid="B30">30</xref>
]. Similar studies with more patients demonstrated equivocal results with low stricture and bladder neck contracture rates (1-2%) [<xref ref-type="bibr" rid="B31">31</xref>
-<xref ref-type="bibr" rid="B33">33</xref>
]. In the first large, multicenter study examining the 80-W KTP laser for the treatment of BOO, Te et al. [<xref ref-type="bibr" rid="B34">34</xref>
] followed 145 patients over 1 year and found durable improvements in all urinary metrics and significant decreases in prostate volume by ultrasound. No patient required a blood transfusion, and only 3% had postoperative urinary retention. Next, the 80-W KTP laser was attempted in larger glands (mean prostate volume, 101 cm<sup>3</sup>
). Sandhu et al. [<xref ref-type="bibr" rid="B35">35</xref>
] found no significant difference in preoperative to postoperative serum sodium levels and durable improvements in urinary metrics up to 1 year. Rajbabu et al. [<xref ref-type="bibr" rid="B36">36</xref>
] performed a similar study in 54 consecutive patients with prostate volumes greater than 100 mL who were followed for 2 years and reported similar results.</p>
<p>Because the procedure is performed with isotonic saline, the risks of electrolyte imbalance, hyponatremia, and fluid absorption are proposed to be lower. As such, the 80-W KTP laser found a role in high-risk patients with cardiopulmonary risk factors. Men with American Society of Anesthesiology (ASA) scores greater than 3 underwent PVP and at 1 year there were no reported major complications [<xref ref-type="bibr" rid="B37">37</xref>
]. Chung et al. [<xref ref-type="bibr" rid="B38">38</xref>
] compiled the largest series of 162 men receiving systemic anticoagulation who underwent 80-W KTP laser prostatectomy. Those authors found an overall 30-day complication rate of 9% with a 0% mortality rate. Only 6 of 162 (3.7%) had delayed bleeding requiring continuous bladder irrigation, and 3 of the 162 (1.9%) required a blood transfusion.</p>
<p>Malek et al. [<xref ref-type="bibr" rid="B39">39</xref>
] presented long-term follow-up data up to 5 years demonstrating durability with delayed hematuria in 3% of men and bladder neck contracture in 2%. No patient had urinary incontinence or newly developed impotence, but up to 26% of the sexually active men experienced retrograde ejaculation. Similarly, Hai [<xref ref-type="bibr" rid="B40">40</xref>
] in 2009 reported 5-year follow-up data with a reoperation rate of 21 of 249 (8.4%); in that study, bladder neck contracture occurred in 3 patients.</p>
<p>PVP has been associated with minimal change in sexual function with some authors reporting an actual improvement in International Index of Erectile Function scores by 7 points [<xref ref-type="bibr" rid="B41">41</xref>
].</p>
<p>Initial concern about prolonged operative time owing to laser inefficiency leading to increased cost was denounced by Stovsky et al. [<xref ref-type="bibr" rid="B42">42</xref>
], who found that the estimated cost of PVP was lower than that of microwave therapy, needle ablation, and TURP.</p>
<p>Taken together, these aforementioned studies thrust the 532-nm KTP laser into the spotlight as a major contender with the gold standard TURP. To address this, several head-to-head trials have compared the 532-nm 80-W KTP laser with conventional TURP. Ruszat et al. [<xref ref-type="bibr" rid="B43">43</xref>
] in 2008 evaluated 396 men assigned to PVP versus TURP in a prospective, nonrandomized two-center study. Those authors found that PVP had a lower rate of intraoperative bleeding, postoperative blood transfusions, capsule perforation, and early postoperative clot retention compared with standard TURP. Furthermore, hospitalization time was shorter in the PVP cohort. Men undergoing TURP demonstrated superior urinary flow rates; however, the IPSS was not significantly different. Reoperation within 2 years was more common in men treated with PVP; however, the difference was not statistically significant. The incidence of urethral and bladder neck strictures was comparable. There have been two randomized trials examining PVP versus TURP. Bouchier-Hayes et al. [<xref ref-type="bibr" rid="B44">44</xref>
] showed that PVP was equivalent to TURP regarding urinary metrics over 1 year yet had markedly reduced hospital length of stay, duration of catheterization, and postoperative adverse events.</p>
<p>The 80-W KTP laser has rivaled TURP despite conflicting results from several randomized clinical trials. It has many theoretical advantages in terms of hemostasis without absorption of hypotonic fluid. Furthermore, several studies have demonstrated its safety in high-risk patients receiving therapeutic anticoagulation. The main criticism of the 80-W KTP laser is the length of operative time owing to the less than ideal vaporization efficiency.</p>
</sec>
<sec><title>3. 120-W KTP LASER</title>
<p>To improve upon vaporization efficiency, the 532-nm 120-W KTP laser was introduced. This new iteration of the hemostatic 532-nm laser used an LBO crystal to better collimate the KTP laser beam. This novel system was termed a "high-performance system" (HPS) [<xref ref-type="bibr" rid="B2">2</xref>
].</p>
<p>Lee et al. [<xref ref-type="bibr" rid="B45">45</xref>
] performed the initial animal studies using the 120-W HPS 532-nm laser with 5 male beagle dogs who underwent antegrade PVP following suprapubic cystotomy. The authors compared the 80-W and 120-W lasers and found that the HPS laser consistently vaporized more tissue during a given period while maintaining a 1- to 2-mm rim of coagulation. When comparing the HPS system at 80 W versus its predecessor at equal wattage, the new HPS system vaporized 50% more tissue in a bovine ex vivo model [<xref ref-type="bibr" rid="B46">46</xref>
].</p>
<p>In one of the largest, multicenter, randomized controlled trials comparing the 532-nm 120-W HPS KTP laser with conventional TURP, Lukacs et al. [<xref ref-type="bibr" rid="B47">47</xref>
] failed to demonstrate the noninferiority of the HPS laser versus TURP on the basis of urinary metrics at 1 year postoperatively. However, the authors did find that PVP was associated with a shorter length of stay in the hospital. In a prospective, randomized trial of 120 men, Al-Ansari et al. [<xref ref-type="bibr" rid="B48">48</xref>
] found the mean operative time to be shorter for TURP, whereas HPS PVP conferred a shorter hospitalization time and duration of catheterization. The improvements in urinary metrics between cohorts were similar; however, the PVP group had a significantly higher number of reoperations. The randomized trial with the longest follow-up actually showed HPS PVP to have a shorter operative time with less intraoperative complications while maintaining a shorter catheterization time and hospital length of stay. After 3 years of follow-up, the urinary metrics between cohorts were similar [<xref ref-type="bibr" rid="B49">49</xref>
].</p>
<p>The 120-W HPS KTP laser has also been evaluated in select patient populations. For example, in high-risk men with ASA scores greater than 3 and evidence of active cardiopulmonary disease, Tao et al. [<xref ref-type="bibr" rid="B50">50</xref>
] showed the new 120-W HPS laser to be safe and effective. For men taking blood-thinning medications, Sohn et al. [<xref ref-type="bibr" rid="B51">51</xref>
] demonstrated that PVP using the HPS laser was safe and effective. For men suffering from urinary retention secondary to advanced prostate cancer, Chen et al. [<xref ref-type="bibr" rid="B52">52</xref>
] found the HPS laser to be safe and effective, despite being associated with a longer mean catheterization duration (3.3±0.8 days) for the relief of LUTS secondary to prostate cancer. For men with detrusor underactivity categorized by the Schafer nomogram, Choi et al. [<xref ref-type="bibr" rid="B53">53</xref>
] found that PVP with the HPS laser was effective for relief of BOO regardless of preexisting detrusor underactivity.</p>
</sec>
<sec><title>4. 180-W KTP LASER</title>
<p>In 2010, the newest edition of KTP 532-nm lasers was approved as the "Xcelerated Performance System" (XPS), which is capable of vaporization up to 180 W. This novel technology, referred to as a MoXy fiber, circulates room-temperature saline to prevent devitrification, which may ultimately reduce power. Manufacturers also improved operative time by increasing the rate of vaporization through a 50% increase in power as well as a 50% increase in laser beam area. The proposed benefit is wider tissue vaporization without a change in the depth of coagulation (1-2 mm).</p>
<p>The first animal study using the 180-W XPS laser was performed in 2011 on eight canines in an anterograde fashion. Malek et al. [<xref ref-type="bibr" rid="B54">54</xref>
] found that the 180-W XPS laser created a 76% larger vaporization cavity and a 77% faster vaporization rate over the 120-W HPS laser. The coagulation zone was 33% larger with the newer model. Meanwhile, at 8 weeks postoperatively, the animals had re-epithelized resection cavities that were indistinguishable by hematoxylin and eosin staining.</p>
<p>The first prospective human study evaluating safety, efficacy, and perioperative outcomes was performed in 2012. Bachmann et al. [<xref ref-type="bibr" rid="B55">55</xref>
] prospectively enrolled roughly 200 men with benign prostatic enlargement to undergo 180-W XPS laser prostatectomy at seven different centers worldwide. With a mean follow-up of roughly 6 months, the authors reported significant improvements in IPSS, Qmax, serum prostate-specific antigen level, and prostate volume with no complications higher than IIIb according to the 2004 Clavien-Dindo classification system. Larger randomized controlled trials with over 1 year of follow-up will be necessary to determine if the XPS laser outperforms other transurethral procedures with superior safety and efficacy.</p>
</sec>
</sec>
<sec><title>THULIUM LASER</title>
<p>The thulium laser has gained tremendous worldwide popularity since its introduction in 2005. Thulium lasers emit a wavelength of 2013 nm, which permits quick absorption of energy by interstitial water [<xref ref-type="bibr" rid="B56">56</xref>
]. This addresses some pitfalls of the aforementioned laser fibers because this characteristic wavelength results in matched water absorption with reduced thermal damage owing to its minimal penetration depth. The thulium laser allows for either a continuous or a pulsed mode and its energy efficiency profile allows it to be a compact, tabletop device suitable for use with any standard 110-V electrical outlet. The technique used with this laser is a combination of vaporization and enucleation until small prostate chips are created and later evacuated. The term "vaporesection" was coined to describe how the thulium laser may resect prostate adenoma while performing concurrent vaporization and ablation. In addition, the laser is also suitable for bladder neck incision [<xref ref-type="bibr" rid="B57">57</xref>
]. In an <italic>ex vivo</italic>
porcine model, Wendt-Nordahl et al. [<xref ref-type="bibr" rid="B58">58</xref>
] found that the continuous wave thulium laser offered a higher tissue ablative capacity and similar hemostatic profile as did the 80-W KTP laser.</p>
<p>Several studies have shown that the thulium laser provides efficient vaporization in a range of prostate sizes; however, the majority of these series were small and retrospective with limited follow-up [<xref ref-type="bibr" rid="B57">57</xref>
,<xref ref-type="bibr" rid="B59">59</xref>
,<xref ref-type="bibr" rid="B60">60</xref>
]. For example, Mattioli et al. [<xref ref-type="bibr" rid="B61">61</xref>
] used a thulium laser in 200 men stratified by prostate size (less than 35 g and greater than 35 g) and found that regardless of prostate size, the thulium laser significantly improved IPSS, uroflowmetry, and PVR, with all patients achieving spontaneous voiding without urinary incontinence.</p>
<p>Xia et al. [<xref ref-type="bibr" rid="B62">62</xref>
] in 2008 randomly assigned 100 men to either thulium laser resection or conventional TURP. The authors found that the thulium laser was superior in terms of catheterization time, length of stay, and hemoglobin drop. There were no significant differences in operative time, postoperative to preoperative symptom scores, QoL, PVR, or Qmax between the groups. Further randomized, prospective data are lacking comparing the thulium laser with other laser technologies; however, the safety and feasibility of this novel modality are promising. When the thulium laser was compared with HoLEP, Zhang et al. [<xref ref-type="bibr" rid="B63">63</xref>
] found that thulium laser transurethral enucleation of the prostate (ThuLEP) demonstrated similar relief of lower urinary tract symptoms when compared with HoLEP in a prospective, randomized trial with 18 months of follow-up. ThuLEP was found to have superior hemostasis but longer operative times compared with HoLEP.</p>
</sec>
<sec><title>DIODE LASERS</title>
<p>There are many diode lasers currently on the market with differing wavelengths. Currently, 940-, 980-, and 1470-nm lasers are all available with some packaged as dual-wave-length lasers. There are limited data evaluating diode lasers compared with KTP or holmium lasers, but the results of initial ex vivo studies are promising. Seitz et al. [<xref ref-type="bibr" rid="B64">64</xref>
] evaluated a 1470-nm diode laser in an isolated, blood-perfused porcine kidney model to assess the vaporization and coagulation properties. They compared their diode laser with an 80-W 532-nm KTP laser and found that the diode laser at 50 W showed significantly lower capacities for tissue removal and larger coagulation zones. The same authors then performed an <italic>in vivo</italic>
study using beagle dogs and found the diode laser to ablate tissue at a rate similar to that of the KTP laser with similar hemostatic properties.</p>
<p>Beyond animal models, there are only a few clinical studies examining diode lasers [<xref ref-type="bibr" rid="B65">65</xref>
,<xref ref-type="bibr" rid="B66">66</xref>
]. Seitz et al. [<xref ref-type="bibr" rid="B67">67</xref>
] used a 1470-nm 50-W side-firing diode laser in 10 men and found significant improvements in Qmax, PVR, prostate volume by TRUS, and prostate-specific antigen levels. However, 2 men (20%) required salvage TURP within 2 months of the initial surgery.</p>
<p>With regard to the 980-nm diode lasers, Leonardi [<xref ref-type="bibr" rid="B68">68</xref>
] conducted a preliminary study in 52 men and found significant improvement in IPSS, Qmax, and PVR with no severe complications or worsening erectile dysfunction. Ruszat et al. [<xref ref-type="bibr" rid="B69">69</xref>
] also examined the 980-nm diode laser in a prospective, nonrandomized study with the 120-W 532-nm KTP laser in 117 men. Those authors found improved hemostasis with the diode laser but higher rates of bladder neck stricture, retreatment, and stress urinary incontinence, which was likely due to the penetration depth and coagulation necrosis associated with the diode laser.</p>
<p>In one of the only randomized, prospective studies comparing a 980-nm 200-W diode laser with the 120-W 532-nm KTP laser in 139 men, Chiang et al. [<xref ref-type="bibr" rid="B70">70</xref>
] found the diode laser was superior with regard to hemostasis but had higher rates of postoperative incontinence and dysuria. Both lasers were similar in their rates of improvement of IPSS, Qmax, and QoL.</p>
<p>Perhaps one potential niche of diode lasers that has been studied is outpatient, office-based laser prostatectomy. Rosenthal and DiTrolio [<xref ref-type="bibr" rid="B71">71</xref>
] reported a small, retrospective series of 200 men who underwent PVP with the Evolve Dual (980-nm/1470-nm) laser system under local periprostatic anesthesia. More recently, the diode laser has been used to perform prostate laser enucleation similar to HoLEP [<xref ref-type="bibr" rid="B72">72</xref>
]. Bachmann et al. [<xref ref-type="bibr" rid="B73">73</xref>
] reported in a systematic review an overall paucity of safety and efficacy data for diode lasers with perioperative dysuria in up to 23.6% of men.</p>
</sec>
<sec sec-type="conclusions"><title>CONCLUSIONS</title>
<p>The ever-changing climate of laser technologies used to treat men with LUTS continues to evolve. Today there are more types of laser fibers than ever before, and urologists remain in a quandary as to which laser technology is superior. Regardless of the type of laser, urologists have come to accept laser prostatectomy as an acceptable alternative to conventional TURP [<xref ref-type="bibr" rid="B74">74</xref>
]. Of all the laser prostatectomy techniques, the most robust evaluations have been performed on HoLEP and the 80-W 532-nm KTP-based PVP technique. Although each laser technology has its differences, both technologies are safe, efficacious, and durable and have acceptable morbidity and mortality rates. Detailed guidelines from the European Association of Urology are available for all current laser technologies to help synthesize the most current data beyond that presented in this review [<xref ref-type="bibr" rid="B75">75</xref>
]. Nevertheless, future randomized studies comparing the differing laser technologies and surgical techniques are necessary to determine superiority.</p>
</sec>
</body>
<back><fn-group><fn fn-type="conflict"><p>The authors have nothing to disclose.</p>
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