KSKobi Stav

Kobi Stav

*This is an algorithmically generated author record based on publicly available information.

Kobi Stav has a total of 54 co-authors. Here are the top co-authors by number of shared publications:


Latest Publications

  • Open Access

    Use of Validated Questionnaires to Predict Cosmetic Outcomes of Hypospadias Repair

    by Amos Neheman, Omri Schwarztuch Gildor, Andrew Shumaker, Ilia Beberashvili, Yuval Bar-Yosef, Shmuel Arnon, Amnon Zisman, Kobi Stav

    Introduction: Hypospadias is a syndrome of penile maldevelopment. The primary goal of hypospadias surgery is to create a penis with normal appearance and function. Historically, the outcome of hypospadias repair has been assessed based on the need for reoperation due to urethroplasty complications (UC), including fistula formation, dehiscence, meatal stenosis, or development of a urethral stricture. The Glans–Urethral Meatus–Shaft (GMS) score is a standardized tool to predict UC. Analysis of the cosmetic outcomes of hypospadias repair based on the appearance of the reconstructed penis has been validated, and standardized scores have been published. The Hypospadias Objective Penile Evaluation (HOPE) score is a validated questionnaire used to assess postoperative cosmetic outcomes. Although predictors of surgical outcomes and UC have been well documented, predictors of optimal cosmetic outcomes are lacking in the literature. Furthermore, reoperation due to cosmetic considerations has been poorly reported. Objective: To identify predictors of cosmetic outcomes after hypospadias repair and to assess the reoperation rate according to cosmetic considerations. Materials and Methods: This prospective cohort study included 126 boys who underwent primary hypospadias repair. The severity of hypospadias, degree of penile curvature, glans width, preoperative HOPE, and GMS scores were documented. The standard technique for single-stage repairs, the tubularized incised plate urethroplasty, was performed. The primary endpoint was cosmetic outcomes evaluated by the HOPE score questionnaire six months postoperatively. Optimal cosmetic results were defined by HOPE scores ≥ 57. Results: The study population consisted of the following cases: 87 (69%) subcoronal, 32 (25%) shaft, and 7 (6%) proximal hypospadias. Among the study participants, 102 boys (81%) had optimal cosmetic results (HOPE ≥ 57), and 24 boys (19%) had surgeries with suboptimal cosmetic outcomes (HOPE < 57). Ancillary procedures were performed in 21 boys (16%), of which 14 (11%) were solely for cosmetic considerations, and 7 were secondary to UC. Using the Receiver Operating Characteristic analysis of potential predictors of optimal cosmetic outcomes, the preoperative HOPE score had the highest area under the curve (AUC = 0.79; 95% CI 0.69–0.89, p < 0.001). After multivariable analysis, the degree of penile chordee (p = 0.013), glans width (p = 0.003), GMS score (p = 0.007), and preoperative HOPE score (p = 0.002) were significant predictors of cosmetic outcomes. Although meatal location predicted suboptimal cosmetic results in univariate analysis, it was not a factor in multivariable analysis. Conclusions: Over 80% of boys undergoing hypospadias repair achieved optimal cosmetic outcomes. More than 10% of cases underwent ancillary procedures, secondary solely to cosmetic considerations. Predictors of optimal cosmetic outcomes after hypospadias surgery included degree of chordee, glans width, and preoperative HOPE and GMS scores, which were the best predictors of satisfactory cosmetic results. Although meatal location is the main predictor of UC, it was not a predictor for cosmetic outcomes. Factors affecting cosmetic outcomes should be clearly explained to parents during the preoperative consultation.


  • Open Access

    Bladder Oversensitivity Is Associated with Bladder Outlet Obstruction in Men

    by Guy Verhovsky, Ilia Baberashvili, Yishai H. Rappaport, Dorit E. Zilberman, Amos Neheman, Jonathan Gal, Amnon Zisman, Kobi Stav

    Objective: The aim of this study was to assess whether there is an objective association between bladder outlet obstruction (BOO) and abnormal sensation parameters during filling cystometry in men. Methods: This was a prospective study. Consecutive patients referred for urodynamic examination were assessed for eligibility. Patients with permanent catheters, BPH related surgery, neurologic disease, or inability to complete the urodynamic study were excluded. All patients underwent full physical examination, as well as renal and bladder ultrasound including prostate size estimation, post void residual volume, and PSA, and they completed the International Prostate Symptoms Score (IPSS) questionnaire. The cohort was divided into obstructed and un-obstructed groups according to the Bladder Outlet Obstruction Index. Results: Ninety of the 115 patients recruited were obstructed (78%). Obstructed patients had significantly higher PSA, larger prostate volume, and higher IPSS. Detrusor overactivity did not differ between the two groups (45.6% vs. 48.1%, p = 0.83). First, normal, strong, and urgent desires to void were significantly lower in obstructed men: median (IQR) 118 (57–128) vs. 180 (80–200), 171 (85–257) vs. 227 (125–350), 221 (150–383) vs. 307 (180–477), and 276 (197–480) vs. 344 (280–535), respectively. First desire to void (FDV) had the highest area under the curve (AUC = 0.83, 95% CI = 0.76–0.90, p < 0.001) for predicting BOO with a Youden index of 0.78 at 140 mL. Conclusions: Our results suggest that there is a strong association between bladder oversensitivity and BOO in men. Men with FDV <140 mL had a significantly increased probability of being obstructed. These findings may shed a light on the pathophysiological connection between obstruction and enhanced afferent signaling from the bladder.


  • Robotic versus laparoscopic ipsilateral uretero-ureterostomy for upper urinary tract duplications in the pediatric population: A multi-institutional review of outcomes and complications

    by Leon Chertin, Binyamin B. Neeman, Kobi Stav, Paul H. Noh, Stanislav Koucherov, Jaudat Gaber, Amnon Zisman, Boris Chertin, Vitaly Dubrov, Sergey Bondarenko, et al.


  • Obestatin levels in response to a meal and association with subsequent appetite sensations in maintenance hemodialysis patients

    by Ilia Beberashvili, Ekaterina Ptashkin, Ada Azar, Ramzia Abu Hamad, Shlomit Koren, Kobi Stav, Shai Efrati


  • Open Access

    Interaction between acyl-ghrelin and BMI predicts clinical outcomes in hemodialysis patients

    by Ilia Beberashvili, Inna Sinuani, Ada Azar, Gregory Shapiro, Leonid Feldman, Keren Doenyas-Barak, Kobi Stav, Shai Efrati

    Ghrelin, a gastric orexigenic peptide, and body mass index (BMI) are known as inversely associated to each other and are both linked to cardiovascular (CV) risk and mortality in maintenance hemodialysis (MHD) patients. However, it is unclear whether the interaction between ghrelin and BMI is associated with a risk of all-cause and CV death in this population. A prospective observational study was performed on 261 MHD outpatients (39% women, mean age 68.6 ± 13.6 years) recruited from October 2010 through April 2012, and were followed until November 2014 (median follow-up-28 months, interquartile range-19–34 months). We measured acyl-ghrelin (AG) levels, appetite, nutritional and inflammatory markers, prospective all-cause and cardiovascular (CV) mortality. During follow-up, 109 patients died, 51 due to CV causes. A significant interaction effect of high BMI and high AG (defined as levels higher than median) on all-cause mortality was found. Crude Cox HR for the product termed BMI x AG was 0.52, with a 95% confidence interval (CI): 0.29 to 0.95 (P = 0.03). Evaluating the interaction on an additive scale revealed that the combined predictive value of BMI and AG is larger than the sum of their individual predictive values (synergy index was 1.1). Across the four BMI-AG categories, the group with high BMI and high AG exhibited better all-cause and cardiovascular mortality irrespective of appetite and nutritional status (multivariable adjusted hazard ratios were 0.31, 95% CI 0.16 to 0.62, P = 0.001, and 0.35, 95% CI 0.13 to 0.91, P = 0.03, respectively). Data analyses made by dividing patients according to fat mass-AG, but not to lean body mass-AG categories, provided similar results. Higher AG levels enhance the favourable association between high BMI and survival in MHD patients irrespective of appetite, nutritional status and inflammation.


  • Provision of information leaflet before urodynamic study reduces the pre-examination anxiety level

    by Kobi Stav, Yoram I. Siegel, Ilia Beberashvili, Hadas Z. Sella, Amnon Zisman

    Aims To find out if information leaflets reduce anxiety levels before urodynamic studies (UDS). Methods One hundred and four patients (age 60 ± 15 years) who were referred for multichannel UDS were prospectively recruited and randomized into 2 groups: (1) received a leaflet containing detailed information regarding the examination; (2) did not receive a leaflet. Patients who were unable to complete the questionnaire due to mental disorders and patients who had previously undergone UDS were excluded. The leaflets were mailed to the patients in group 1 one month before the examination. This leaflet included information on how the examination would be performed, its purpose, recommended preparation, potential complications, and common events that might occur in association with the examination, such as incontinence. Emotional distress was measured by the State Anxiety Inventory (SAI)—a validated questionnaire composed of 20 items measuring anxiety. These measures are divided into two psychological domains: (1) positive well being; (2) psychological distress. Patients filled out the SAI immediately before entering the examination room. Results Demographics and clinical and psychological co‐morbidities were similar between the groups. The “psychological distress“ score was significantly lower in group 1 (13.1 ± 2.9 vs. 24.8 ± 5.8, P < 0.001), whereas there was no difference in the “positive well being“ score. Conclusions We recommend providing patients with an information leaflet on UDS since it significantly reduces anxiety levels. Neurourol. Urodynam.


  • Liquid paraffin is superior to 2% lidocaine gel in reducing urethral pain during urodynamic study in men: A pilot study

    by Kobi Stav, Eyal Taleb, Itay M. Sabler, Yoram I. Siegel, Ilia Beberashvili, Amnon Zisman

    Aims To compare the pain perception between intraurethral instillation of 2% lidocaine gel and liquid paraffin during Urodynamic study in men. Methods A randomized, single‐blind comparison trial was conducted. Forty men scheduled to undergo multichannel Urodynamic study were randomized to receive either 10 ml of 2% lidocaine gel (group 1, n = 20) or 10 ml of liquid paraffin (group 2, n = 20). Patients recorded their pain on a 0–10 visual analog scale prior to lubricant instillation, immediately after lubricant instillation, after the introduction of the Urodynamic catheter, 5 and 30 min after the catheter was taken out. Results pain scores were significantly higher in group 1 compared to group 2 immediately after the instillation of the lubricants (4.2 ± 1.5 vs. 2.6 ± 0.9, P < 0.001) and after catheterization (4.8 ± 1.5 vs. 3.5 ± 1.1, P < 0.01). There were no differences in the pain scores between the two groups in the other time points that were evaluated. Conclusions Liquid paraffin is more efficient than 2% lidocaine gel in reducing urethral pain during Urodynamic study in men. Pain scores were specifically better during the instillation of the lubricant and during the delivery of the urethral catheter. Neurourol. Urodynam.