|Year : 2017 | Volume
| Issue : 2 | Page : 248-255
Comparison of surgical effect and postoperative patient experience between laparoendoscopic single-site and conventional laparoscopic varicocelectomy: a systematic review and meta-analysis
Zheng Zhang, Shu-Juan Zheng, Wen Yu, You-Feng Han, Hai Chen, Yun Chen, Yu-Tian Dai
Department of Andrology, Affiliated Drum Tower Hospital, School of Medicine, Nanjing University, Nanjing 210008, China
|Date of Submission||10-Aug-2015|
|Date of Decision||20-Jan-2016|
|Date of Acceptance||06-Mar-2016|
|Date of Web Publication||20-May-2016|
Department of Andrology, Affiliated Drum Tower Hospital, School of Medicine, Nanjing University, Nanjing 210008, China
Source of Support: None, Conflict of Interest: None
The present meta-analysis was conducted to compare the clinical effect and patient experience of laparoendoscopic single-site varicocelectomy (LESSV) and conventional laparoscopic varicocelectomy. The candidate studies were included after literature search of database Cochrane Library, PubMed, EMBASE, and MEDLINE. Related information on essential data and outcome measures was extracted from the eligible studies by two independent authors, and a meta-analysis was conducted using STATA 12.0 software. Subgroup analyses were conducted by study design (RCT and non-RCT). The odds ratio (OR) or standardized mean difference (SMD) and their 95% confidence intervals (95% CIs) were used to estimate the outcome measures. Seven articles were included in our meta-analysis. The results indicated that patient who had undergone LESSV had a shorter duration of back to work (overall: SMD = −1.454, 95% CI: −2.502-−0.405, P = 0.007; non-RCT: SMD = −2.906, 95% CI: −3.796-−2.017, P = 0.000; and RCT: SMD = −0.841, 95% CI: −1.393-−0.289, P = 0.003) and less pain experience at 3 h or 6 h (SMD = −0.447, 95% CI: −0.754-−0.139, P = 0.004), day 1 (SMD = −0.477, 95% CI: −0.905-−0.05, P = 0.029), and day 2 (SMD = −0.612, 95% CI: −1.099-−0.125, P = 0.014) postoperatively based on RCT studies. However, the meta-analyses based on operation time, clinical effect (improvement of semen quality and scrotal pain relief), and complications (hydrocele and recurrence) yielded nonsignificant results. In conclusion, LESSV had a rapid recovery and less pain experience over conventional laparoscopic varicocelectomy. However, there was no statistically significant difference between the two varicocelectomy techniques in terms of the clinical effect and the incidence of hydrocele and varicocele recurrence. More high-quality studies are warranted for a comprehensive conclusion.
Keywords: complications; conventional laparoscopic varicocelectomy; laparoendoscopic single-site varicocelectomy; meta-analysis; pain score; semen quality
|How to cite this article:|
Zhang Z, Zheng SJ, Yu W, Han YF, Chen H, Chen Y, Dai YT. Comparison of surgical effect and postoperative patient experience between laparoendoscopic single-site and conventional laparoscopic varicocelectomy: a systematic review and meta-analysis. Asian J Androl 2017;19:248-55
|How to cite this URL:|
Zhang Z, Zheng SJ, Yu W, Han YF, Chen H, Chen Y, Dai YT. Comparison of surgical effect and postoperative patient experience between laparoendoscopic single-site and conventional laparoscopic varicocelectomy: a systematic review and meta-analysis. Asian J Androl [serial online] 2017 [cited 2017 Jul 28];19:248-55. Available from: http://www.ajandrology.com/text.asp?2017/19/2/248/181194 - DOI: 10.4103/1008-682X.181194
Zheng Zhang, Shu-Juan Zheng
Both authors contributed equally to this work
| Introduction|| |
Varicocele, defined as dilated and tortuous veins of the pampiniform plexus of scrotal veins, is relatively prevalent among males. Varicocele occurs in approximately 15% of the male population. Notably, it was observed in 21%-39% of infertile men. Varicoceles are indicated in the cause of male infertility by increasing scrotal region temperature or promoting oxidative stress in the seminiferous tubules spermatogenic environment., Except for subfertility, the main complaints of varicocele include scrotal pain or discomfort and ill-defined scrotal mass.
Although several surgical approaches have been applied for varicocele treatment, including open surgical spermatic vein ligation, microsurgical and laparoscopic varicocelectomy, and retrograde or antegrade sclerotherapy, the ideal method is still a matter of controversy. Notably, various clinical studies and systematic reviews and meta-analyses have confirmed a positive role of laparoscopic approach in the treatment of varicocele. Its advantages over standard open surgeries attributed to its relatively rapid recovery.,, It was also associated with shorter operation time, less training and lower patient costs when compared to microscopic varicocelectomy.,,,,
In an attempt to reduce the number of incisions and ports in laparoscopic surgeries, laparoendoscopic single-site surgery was introduced and further obtained a popular application.,,, Since the first report of laparoendoscopic single-site varicocelectomy (LESSV) by Kaouk and Palmer in 2008, several studies have been published to evaluate its clinical effect and its potential application alternative to the conventional laparoscopic procedures. However, there was discrepancy among these studies.,,,,,,,,, Therefore, we applied systematic evaluation and meta-analysis of the limited data together to provide a more precise and comprehensive estimation on the advantages and disadvantages of LESSV over conventional laparoscopic approaches while focusing on its surgical effect and patient experience postoperatively.
| Materials and Methods|| |
The preferred reporting items for systematic reviews and meta-analysis (PRISMA) were used to conduct this present meta-analysis.
We conducted electronic searches in the database Cochrane Library, PubMed, EMBASE, and MEDLINE up to August 1, 2015, using the MeSH terms "varicocele," "varicocelectomy," "Laparoendoscopic single-site," "single incision," and "laparoscopic" (alone or in combination). All retrieved articles were screened for potential inclusion according to the predefined inclusion and exclusion criteria by two independent reviewers (Zheng Zhang, Shu-Juan Zheng).
Randomized controlled trials (RCT) and nonrandomized controlled trials, prospective or retrospective cohort, and case-control studies (non-RCT) comparing laparoendoscopic single-site approach and conventional laparoscopic approach for varicocele repair were included in our meta-analysis with quantitative data available on related outcome measures.
Type of participants
Patients (adults or adolescents) who underwent varicocelectomy (laparoendoscopic single-site or conventional laparoscopic approach) were included in the present study.
Type of interventions
Laparoendoscopic single-site versus conventional laparoscopic approach for the treatment of varicocele.
Type of outcome measures
Operative time, postoperative pain score, hospital stay and time to return to normal activity after the surgery, patients who had scrotal pain relief or improved semen quality postoperatively, postoperative complications: hydrocele formation and varicocele recurrence, and patient satisfaction rate of wound cosmetic appearance were measured in the meta-analyses.
(1) Incomplete data; (2) reviews, animal experiments, case reports, comments, editorials, letters, and congress; (3) data not available; and (4) non-English published articles.
The bias assessment of each included study was analyzed using the Cochrane Collaboration bias appraisal tool, which including the following items: (1) adequate sequence generation, (2) allocation concealment, (3) blinding, (4) incomplete outcome data addressed, (5) free of selective addressed, and (6) free of other bias. Each item was answered with "yes," "no," or "unclear" by two investigators (Zheng Zhang, Shu-Juan Zheng). Any disagreement was dissolved by open discussion.
Evidence quality assessment
Two reviewers (Zheng Zhang, Shu-Juan Zheng) independently used the Newcastle-Ottawa Scale (NOS) (nonrandomized studies) and Jadad scale (randomized controlled studies) to assess the quality of the included studies. Studies with overall quality scores of more than 5 in NOS 9-scale system or more than 3 in Jadad system were considered high-quality.
Study enrollment and data extraction
Two investigators (Zheng Zhang, Shu-Juan Zheng) independently assessed articles for possible enrollment according to the inclusion and exclusion criteria and extracted related information, which includes study characteristics, the first author's name, year of publication, and related data in the two approaches on outcome measures. Any discrepancy was consulted by discussion between the two investigators.
This systematic review and meta-analysis was performed using STATA software (version 12.0; Stata Corporation, College Station, TX, USA). Heterogeneity among the articles was measured using Q-test or I value. The heterogeneity was considered significant if P < 0.1 or I >40%. The random effect model was adopted if there was heterogeneity among the studies. Otherwise, we selected the fixed-effects model. Odds Ratio (OR) or standardized mean difference (SMD) and their corresponding 95% confidence intervals (95% CIs) were calculated for outcomes. Subgroup analysis was performed by study design. Publication bias was estimated using Begg's funnel plots and Egger's test. A value of "Pr > |z|'' above 0.05 for Begg's funnel plots or a value of ''P > |t|'' above 0.05 for Egger's test was considered negative publication bias. Sensitivity analyses were conducted to determine the effect of each study on the summary meta-analysis estimate.
| Results|| |
Characteristics of the included studies and evidence quality assessment We obtained 145 articles based on the search strategy. However, after the screening process, 124 articles were excluded. Of the remaining 21 articles, 14 were excluded and seven studies,,,,,, including three RCTs,, and four non-RCTs,,, were indentified for our meta-analysis. According to the established evidence quality assessment criteria, three studies were of moderate quality,, while the other four were high-quality evidence.,,, The flowchart of the process for the identification of the studies is shown in [Figure 1]. The characteristics of the selected studies and quality assessment results are summarized in [Table 1] .
|Figure 1: The flowgram of the identification and selection of the studies|
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The risk of bias assessment is indicated in [Table 2]. Of the seven studies included, three studies showed the method of allocation concealment and randomization methods.,, All seven studies addressed incomplete outcome data while only one study was free of selective reporting.
The results of meta-analysis
Operation time and postoperative patient experience
All seven studies reporting operation time were included in the meta-analysis.,,,,,, The pooled SMD demonstrated that there was no significant difference between the LESSV and conventional laparoscopic varicocelectomy (laparoendoscopic vs conventional, SMD = −0.065, 95% CI: −0.533-0.402, P = 0.784). Subgroup analysis by study design showed a similar trend with the overall analysis (non-RCT: SMD = −0.436, 95% CI: −1.443-0.72, P = 0.397; RCT: SMD = 0.201, 95% CI: −0.073-0.475, P = 0.151) [Figure 2]a and [Table 3].
|Figure 2: Forest plots for the comparison of operation time and postoperative patient experience. (a) operation time; (b) postoperative pain score at 3 h or 6 h; (c) postoperative pain score at day 1; (d) postoperative pain score at day 2; (e) hospital stay; (f) time to return to work; and (g) patient satisfaction rate of cosmetic appearance.|
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Several studies included made a comparison of the patient pain experience evaluated by the visual analog scale postoperatively of the two approaches. In the analysis of the included three articles,,, with the assessment of pain score at 3 h or 6 h postoperatively, the overall and subgroup SMD indicated that patients underwent LESSV had lower pain scores than that of conventional laparoscopic approaches (overall: SMD = −0.467, 95% CI: −0.728-−0.205, P = 0.000; RCT: SMD = −0.447, 95% CI: −0.754-−0.139, P = 0.004; and non-RCT: SMD = −0.519, 95% CI: −1.017-−0.20, P = 0.042) [Figure 2] and [Table 3], with no heterogeneity existed (I = 0%). Pooled analyses were also performed in the enrolled articles with an evaluation of postoperative pain score at day 1 and day 2. Five studies compared the pain score at day 1,,,, while four at day 2,,, after the surgery were included. The results indicated that patient who had undergone LESSV had less pain experience over those in conventional laparoscopic procedures in RCT studies (day 1: SMD = −0.477, 95% CI: −0.905-−0.05, P = 0.029 [Figure 2]c and [Table 3]; day 2: SMD = −0.612, 95% CI: −1.099-−0.125, P = 0.014 [Figure 2]d and [Table 3], yet it was not confirmed in the overall and non-RCT studies.
In addition, there was no significant difference between LESSV and conventional laparoscopic varicocelectomy in terms of hospital stay (overall: SMD = −0.766, 95% CI: −1.732-0.200, P = 0.120; non-RCT: SMD = −0.586, 95% CI: (1.183-0.011, P = 0.054; and RCT: SMD = −0.834, 95% CI: −2.418-0.75, P = 0.302),,,, [Figure 2]e and [Table 3]. However, the time to return to work was significantly shorter after the LESSV than that of conventional laparoscopic varicocelectomy (overall: SMD = −1.454, 95% CI: −2.502-−0.405, P = 0.007; non-RCT: SMD = −2.906, 95% CI: −3.796-−2.017, P = 0.000; and RCT: SMD = −0.841, 95% CI: −1.393-−0.289, P = 0.003),, [Figure 2] f and [Table 3].
Furthermore, pooled analyses concerning the patient satisfaction rate of wound cosmetic appearance were also conducted.,,, The satisfaction rate was comparable of the two varicocelectomy approaches in the overall and subgroup analyses (overall: OR = 1.129, 95% CI: 0.788-1.617, P = 0.508; non-RCT: OR = 1.269, 95% CI: 0.680-2.369, P = 0.454; and RCT: OR = 1.066, 95% CI: 0.687-1.654, P = 0.777) [Figure 2]g and [Table 3].
Surgical effect: improvement of semen parameters and resolution of testicular pain
Patients would like to perform varicocelectomy for different indications: subfertility or testicular pain. In the present meta-analyses, pooled analyses were conducted in terms of the proportions of patients having improvement of semen parameters or resolution of scrotal pain. Concerning patients having improvement of sperm quality, the results did not favor LESSV over conventional procedures (overall: OR = 1.004, 95% CI: 0.570-1.769, P = 0.989; non-RCT: OR = 0.962, 95% CI: 0.377-2.450, P = 0.935; and RCT: OR = 1.029, 95% CI: 0.505-2.099, P = 0.937),, [Figure 3]a and [Table 3] . Similar results were obtained in terms of the percentage of patients having resolution of testicular pain (overall: OR = 1.015, 95% CI: 0.591-1.741, P = 0.958; non-RCT: OR = 1.056, 95% CI: 0.435-2.566, P = 0.904; and RCT: OR = 0.991, 95% CI: 0.501-1.958, P = 0.979),,,, [Figure 3] and [Table 3].
|Figure 3: Forest plots for the comparison of surgical effect. (a) improvement of semen parameters; (b) resolution of testicular pain|
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Complications: hydrocele formation and recurrence
The main complications postoperatively with respect to hydrocele formation and varicocele occurrence were also analyzed. There was no significant difference between the two varicocelectomy approaches in incidence of hydrocele formation (overall: OR = 0.977, 95% CI: 0.345-2.764, P = 0.965; non-RCT: OR = 1.265, 95% CI: 0.278-5.766, P = 0.761; and RCT: OR = 0.784, 95% CI: 0.188-3.258, P = 0.737) [Figure 4]a and [Table 3] and recurrence (overall: OR = 0.877, 95% CI: 0.216-3.569, P = 0.855; non-RCT: OR = 0.568, 95% CI: 0.034-9.484, P = 0.694; and RCT: OR = 1.008, 95% CI: 0.200-5.092, P = 0.992) [Figure 4]b and [Table 3].
|Figure 4: Forest plots for the comparison of postoperative complications. (a) hydrocele formation; (b) recurrence|
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Assessment of publication bias and sensitivity analyses
Sensitivity analyses were also conducted to determine the effect of each study on the summary meta-analysis and no substantial changes occurred for the corresponding ORs or SMDs. To assess the publication bias between the studies, Begg's funnel plots and Egger's test were conducted. The main results of the tests are shown in [Table 3]. In the analysis of "operation time" items, Begg's test indicated no publication bias (Pr > |z| = 0.548), but Egger's test found publication bias (P > |t| = 0.015). Publication bias was not found in the remaining results of the meta-analysis.
| Discussion|| |
LESS surgery is introduced to comply with the minimally invasive principle in surgical procedures. It has been performed in a variety of surgeries, including nephrectomies, cholecystectomies, and appendectomies.,, LESS surgery has been proven to be applicable in the clinical field, being feasible and effective, with high patients' satisfaction rates of the cosmetic appearance., Several systematic reviews and meta-analyses have confirmed that LESS surgery offers comparable surgical outcome and feasible alternative to its conventional laparoscopic counterpart.,,,,,,, Its significant advantage over conventional laparoscopic surgery is also noted in terms of postoperative patient experience, evaluated with postoperative pain score or analgesic requirement in several evidence-based studies,,,, yet not confirmed in some other studies., Patients who had undergone LESS nephrectomy also benefit from shorter hospital stay and shorter recovery time while LESS cholecystectomy patients show a lesser physical quality of life. These results were consistent with the present meta-analyses that LESSV patients had a shorter duration of back to work.
LESS surgery is introduced over conventional laparoscopy surgery for an effort to improve the wound cosmetic outcome. Some patients would otherwise prefer the open surgery with only one wound. Although Fan et al. concluded in a systematic review with 25 studies and 1094 cases identified that patient who had undergone LESS nephrectomy had better cosmetic outcome over conventional laparoscopic nephrectomy, it was not confirmed in some other, and the current meta-analyses. The possible explanation for this could be the limited source of studies and data included or varied criteria established to self-define "cosmetic satisfaction." Therefore, further larger studies with scientific definition assessing "patient satisfaction" are needed to strengthen the evidence.
In the current meta-analysis, the operation time of two surgical methods of varicocelectomy was similar, which was consistent with some previous studies.,, Some evidence studies even reported a longer operation time in LESS procedures.,, Notably, in spite of these controversy findings, there were no studies reporting a less operation time in LESS surgeries. This may represent a challenge against its acceptance by surgeons.
Blood loss in surgeries is a pivotal parameter to evaluate advantages and disadvantages of surgical methods. In the enrolled seven articles for the meta-analysis, a total of three studies reported the blood loss outcome.,, Although pooled analysis was not conducted because of the limited data, these studies described an "insignificant" estimated blood loss and it was comparable between the two varicocelectomy methods. However, future studies with more important outcome measures involved are needed for a better and more comprehensive estimation.
Notably, whether the surgical effect of a specific varicocelectomy procedure, mostly regarding semen quality improvement and scrotal pain relief, was associated with the laterality of varicocelectomy has been controversial. Libman et al. and Baazeem et al. reported that males underwent bilateral microsurgical varicocelectomy had greater increase in sperm percent motility than that of unilateral varicocelectomy while it was not confirmed in Fujisawa's study. On the other hand, Maghraby reported that 46 of 51 patients underwent left laparoscopic varicocelectomy while three of seven patients in bilateral laparoscopic varicocelectomy procedures had scrotal pain relief, which indicated statistical significance. However, Kachrilas et al. failed to identify this result in another observation. In the current experiment, three studies analyzed semen quality improvement,,, of which one study included patients of unilateral varicocele, one bilateral, and one unilateral and bilateral. The rate of patients with unilateral varicocelectomy having improved semen quality was similar between LESS and conventional laparoscopic approaches (single-site vs conventional, 5/6 vs 16/16, Friedersdorff et al. 2013). Similar results were obtained in Micali's study based on bilateral varicocelectomy (single-site versus conventional, 7/10 versus 9/14) and Youssef's study with left and bilateral varicocelectomy included (single-site vs conventional, 28/37 vs 25/34). Single-site and conventional laparoscopic varicocelectomy resulted in comparable incidence of patients having scrotal pain relief in the current study. Accordingly, we further analyzed that this surgical effect of these two varicocelectomy methods could possibly be varicocele side-related using meta-analytical method. In the current study, two studies were based on unilateral varicocelectomy, while the other three unilateral and bilateral.,, Both "unilateral" varicocelectomy subgroup and "unilateral and bilateral" varicocelectomy subgroup yielded similar rate of patients having scrotal pain relief between single-site and conventional laparoscopic procedures (unilateral: OR = 1.007, 95% CI: 0.688-1.517, P = 0.914; unilateral and bilateral: OR = 0.994, 95% CI: 0.682-1.451, P = 0.977) and indicated that the side of variococelectomy was not associated with the surgical outcome of these two surgical choices. However, due to the limited data and some other possible factors may affect surgical effect, such as grade of varicocele, definite conclusion cannot be reached and more high-quality studies are needed to better illustrate the possible relationship between laterality of varicocelectomy and surgical effect of specific varicocelectomy choices.
Several limitations should pay attention to our meta-analysis. First, the number of studies and subjects included in the present meta-analysis is relatively small, which resulted in limited statistical power. We enrolled seven studies with only three RCTs, and the subject number varied from 11 to 79. Second, some heterogeneity existed in the present meta-analysis and 5/7 of the included studies cannot exclude existence of other bias, which lowered the value of the interpretation of results of the present meta-analysis. These findings remind us that the results of this meta-analysis should be interpreted with caution and better designed studies and high-quality studies, like RCTs, with larger sample size involved are warranted for a more precise estimation. Third, because of the limited data, the current meta-analysis was conducted to describe a favorable surgical method between LESSV and conventional laparoscopic varicocelectomy. However, since there were various surgical varicocelectomy techniques, more high-quality studies concerning the comparison of LESS approaches and other varicocelectomy surgical methods or systematic reviews and meta-analyses, like network meta-analyses, are needed for an overall estimation to determine the best method for varicocele treatment, which should provide qualified surgical outcomes and low incidence of complications, while offering favorable patient experience at the same time.
Despite these limitations, there are some advantages of our meta-analysis that should be taken consideration. First, this was the first systematic review and meta-analysis to assess the surgical outcomes and patient experience of LESSV in comparison with conventional laparoscopic varicocelectomy. Second, we performed stratified analyses by study design (RCT and non-RCT). This partially explains the source of this heterogeneity existed among the studies. Third, we further performed Begg's funnel plots and Egger's test to assess the publication bias, which offers a better understanding of the present status of studies in this field. Thus, we consider the results of the present meta-analyses reliable.
In summary, the present meta-analysis suggests that when compared to conventional laparoscopic varicocelectomy, LESS procedure was associated with less pain experience and shorter duration of back to work. Its advantages regarding operation time, clinical effect concerning semen quality improvement and scrotal pain relief, postoperative hydrocele, varicocele recurrence rate, and postoperative satisfaction rate of wound appearance were not confirmed in the present meta-analysis. However, more studies concerning this topic are needed to further illustrate the issue.
| Author Contributions|| |
ZZ and SJZ carried out the literature search and data extraction, participated in the data analysis and drafted the manuscript. WY and YFH participated in the study design and performed the statistical analysis. HC and YC participated in the data extraction and statistical analysis. YTD conceived of the study and participated in its design and coordination and helped draft the manuscript. All authors read and approved the final manuscript.
| Competing Interests|| |
All authors declared no competing financial interests.
| Acknowledgments|| |
The study was supported by the National Natural Science Foundation of China (No. 81170563 and 81270694 and 81571430).
| References|| |
Hopps CV, Lemer ML, Schlegel PN, Goldstein M. Intraoperative varicocele anatomy: a microscopic study of the inguinal versus subinguinal approach. J Urol
2003; 170: 2366-70.
Greenberg SH. Varicocele and male fertility. Fertil Steril
1977; 28: 699-706.
Mostafa T, Rashed L, Taymour M. Seminal cyclooxygenase relationship with oxidative stress in infertile oligoasthenoteratozoospermic men with varicocele. Andrologia
2016; 48: 137-42.
Sohrabipour S, Jafari A, Kamalinejad M, Sarrafnejd A, Shahrestany T, et al.
The role of flaxseed and Vitamin E on oxidative stress in prepubertal rats with experimental varicocele: an experimental study. Iran J Reprod Med
2013; 11: 459-66.
Wang J, Xia SJ, Liu ZH, Tao L, Ge JF, et al.
Inguinal and subinguinal micro-varicocelectomy, the optimal surgical management of varicocele: a meta-analysis. Asian J Androl
2015; 17: 74-80.
Ding H, Tian J, Du W, Zhang L, Wang H, et al.
Open non-microsurgical, laparoscopic or open microsurgical varicocelectomy for male infertility: a meta-analysis of randomized controlled trials. BJU Int
2012; 110: 1536-42.
Al-Kandari AM, Shabaan H, Ibrahim HM, Elshebiny YH, Shokeir AA. Comparison of outcomes of different varicocelectomy techniques: open inguinal, laparoscopic, and subinguinal microscopic varicocelectomy: a randomized clinical trial. Urology
2007; 69: 417-20.
Riccabona M, Oswald J, Koen M, Lusuardi L, Radmayr C, et al.
Optimizing the operative treatment of boys with varicocele: sequential comparison of 4 techniques. J Urol
2003; 169: 666-8.
McManus MC, Barqawi A, Meacham RB, Furness PD 3 rd
, Koyle MA. Laparoscopic varicocele ligation: are there advantages compared with the microscopic subinguinal approach? Urology
2004; 64: 357-60.
White WM, Haber GP, Goel RK, Crouzet S, Stein RJ, et al.
Single-port urological surgery: single-center experience with the first 100 cases. Urology
2009; 74: 801-4.
Rais-Bahrami S, Montag S, Atalla MA, Andonian S, Kavoussi LR, et al.
Laparoendoscopic single-site surgery of the kidney with no accessory trocars: an initial experience. J Endourol
2009; 23: 1319-24.
Piskun G, Rajpal S. Transumbilical laparoscopic cholecystectomy utilizes no incisions outside the umbilicus. J Laparoendosc Adv Surg Tech A
1999; 9: 361-4.
Kala Z, Hanke I, Neumann C. A modified technic in laparoscopy-assisted appendectomy - A transumbilical approach through a single port. Rozhl Chir
1996; 75: 15-8. [Article in Czech].
Kaouk JH, Palmer JS. Single-port laparoscopic surgery: initial experience in children for varicocelectomy. BJU Int
2008; 102: 97-9.
Youssef T, Abdalla E. Single incision transumbilical laparoscopic varicocelectomy versus the conventional laparoscopic technique: a randomized clinical study. Int J Surg
2015; 18: 178-83.
Wang J, Xue B, Shan YX, Cui Y, Tao W, et al.
Laparoendoscopic single-site surgery with a single channel versus conventional laparoscopic varicocele ligation: a prospective randomized study. J Endourol
2014; 28: 159-64.
Micali S, Ghaith A, Martorana E, Zordani A, Territo A, et al.
Bilateral spermatic cord en bloc ligation by laparoendoscopic single-site surgery: preliminary experience compared to conventional laparoscopy. BMC Urol
2014; 14: 83.
Marte A, Pintozzi L, Cavaiuolo S, Parmeggiani P. Single-incision laparoscopic surgery and conventional laparoscopic treatment of varicocele in adolescents: comparison between two techniques. Afr J Paediatr Surg
2014; 11: 201-5.
Lee SW, Lee JY, Kim KH, Ha US. Laparoendoscopic single-site surgery versus conventional laparoscopic varicocele ligation in men with palpable varicocele: a randomized, clinical study. Surg Endosc
2012; 26: 1056-62.
Kawauchi A, Kamoi K, Soh J, Naitoh Y, Okihara K, et al.
Laparoendoscopic single-site urological surgery: initial experience in Japan. Int J Urol
2010; 17: 289-92.
Kang DH, Lee JY, Chung JH, Jo JK, Lee SH, et al.
Laparoendoscopic single site varicocele ligation: comparison of testicular artery and lymphatic preservation versus complete testicular vessel ligation. J Urol
2013; 189: 243-9.
Friedersdorff F, Aghdassi SJ, Werthemann P, Cash H, Goranova I, et al.
Laparoendoscopic single-site (LESS) varicocelectomy with reusable components: comparison with the conventional laparoscopic technique. Surg Endosc
2013; 27: 3646-52.
Barone JG, Johnson K, Sterling M, Ankem MK. Laparoendoscopic single-site varicocele repair in adolescents-initial experience at a single institution. J Endourol
2011; 25: 1605-8.
Bansal D, Riachy E, Defoor WR Jr., Reddy PP, Minevich EA, et al.
Pediatric varicocelectomy: a comparative study of conventional laparoscopic and laparoendoscopic single-site approaches. J Endourol
2014; 28: 513-6.
Moher D, Liberati A, Tetzlaff J, Altman DG. Preferred reporting items for systematic reviews and meta-analyses: the PRISMA statement. Int J Surg
2010; 8: 336-41.
Stang A. Critical evaluation of the Newcastle-Ottawa scale for the assessment of the quality of nonrandomized studies in meta-analyses. Eur J Epidemiol
2010; 25: 603-5.
Kaouk JH, Autorino R, Kim FJ, Han DH, Lee SW, et al.
Laparoendoscopic single-site surgery in urology: worldwide multi-institutional analysis of 1076 cases. Eur Urol
2011; 60: 998-1005.
Autorino R, Cadeddu JA, Desai MM, Gettman M, Gill IS, et al.
Laparoendoscopic single-site and natural orifice transluminal endoscopic surgery in urology: a critical analysis of the literature. Eur Urol
2011; 59: 26-45.
Zhong X, Rui YY, Zhou ZG. Laparoendoscopic single-site versus traditional laparoscopic surgery in patients with cholecystectomy: a meta-analysis. J Laparoendosc Adv Surg Tech A
2012; 22: 449-55.
Wang L, Wu Z, Li M, Cai C, Liu B, et al.
Laparoendoscopic single-site adrenalectomy versus conventional laparoscopic surgery: a systematic review and meta-analysis of observational studies. J Endourol
2013; 27: 743-50.
Song T, Kim ML, Jung YW, Yoon BS, Joo WD, et al.
Laparoendoscopic single-site versus conventional laparoscopic gynecologic surgery: a metaanalysis of randomized controlled trials. Am J Obstet Gynecol
2013; 209: 317.e1-9.
Siddiqui MR, Kovzel M, Brennan SJ, Priest OH, Preston SR, et al.
The role of the laparoendoscopic single site totally extraperitoneal approach to inguinal hernia repairs: a review and meta-analysis of the literature. Can J Surg
2014; 57: 116-26.
Hu Q, Gou Y, Sun C, Xu K, Xia G, et al
. A systematic review and meta-analysis of current evidence comparing laparoendoscopic single-site adrenalectomy and conventional laparoscopic adrenalectomy. J Endourol
2013; 27: 676-83.
Fan X, Lin T, Xu K, Yin Z, Huang H, et al.
Laparoendoscopic single-site nephrectomy compared with conventional laparoscopic nephrectomy: a systematic review and meta-analysis of comparative studies. Eur Urol
2012; 62: 601-12.
Brandao LF, Laydner H, Zargar H, Torricelli F, Andreoni C, et al.
Laparoendoscopic single site surgery versus conventional laparoscopy for transperitoneal pyeloplasty: a systematic review and meta-analysis. Urol Ann
2015; 7: 289-96.
Autorino R, Brandao LF, Sankari B, Zargar H, Laydner H, et al.
Laparoendoscopic single-site (LESS) vs laparoscopic living-donor nephrectomy: a systematic review and meta-analysis. BJU Int
2015; 115: 206-15.
Libman J, Jarvi K, Lo K, Zini A. Beneficial effect of microsurgical varicocelectomy is superior for men with bilateral versus unilateral repair. J Urol
2006; 176: 2602-5.
Baazeem A, Boman JM, Libman J, Jarvi K, Zini A. Microsurgical varicocelectomy for infertile men with oligospermia: differential effect of bilateral and unilateral varicocele on pregnancy outcomes. BJU Int
2009; 104: 524-8.
Fujisawa M, Ishikawa T, Takenaka A. The efficacy of bilateral varicocelectomy in patients with palpable bilateral varicoceles: comparative study with unilateral varicocele. Urol Res
2003; 31: 407-9.
Maghraby HA. Laparoscopic varicocelectomy for painful varicoceles: merits and outcomes. J Endourol
2002; 16: 107-10.
Kachrilas S, Popov E, Bourdoumis A, Akhter W, El Howairis M, et al.
Laparoscopic varicocelectomy in the management of chronic scrotal pain. JSLS
2014; 18: e2014.00302.
[Figure 1], [Figure 2], [Figure 3], [Figure 4]
[Table 1], [Table 2], [Table 3]