Randomised, quadruple blinded, placebo controlled, multicentre trial investigating prophylactic tamsulosin in prevention of postoperative urinary retention in men after endoscopic total extraperitoneal inguinal hernia repair (STOP-POUR trial): a study protocol

IntroductionPostoperative urinary retention (POUR) is a common complication after inguinal hernia repair with a reported incidence up to 34%. It can be described as the inability to initiate urination or insufficient bladder emptying following surgery. It usually requires the use of catheterisation to empty the bladder in order to prevent further injury to the bladder or kidneys and to relief from pain. Tamsulosin is a medication that is commonly used in men with urinary symptoms related to an enlarged prostate. There is some evidence to suggest that it may also potentially be beneficial for preventing POUR.Methods and analysisThis is a multicentre, blinded, prospective, phase IV randomised controlled trial with parallel allocation. Six hundred and thirty-four patients scheduled for elective endoscopic inguinal hernia repair surgery will be recruited. There will be effective (concealed) randomisation of the subjects to the intervention/control groups. Group assignment will be performed using a covariate-adaptive allocation procedure to provide a balance for selected covariates. The interventional group receives 0.4 mg tamsulosin hydrochloride and the control-group receives one placebo capsule matching the active study drug, both daily, starting from 5 days prior to the day of surgery, at the day of surgery and for 1 day following surgery. The primary outcome is any need for urinary catheterisation postoperatively as a binary outcome. Secondary outcome measures include postoperative pain, change in International Prostate Symptom Score from baseline prior to surgery to after surgery and hospital stay.Ethics and disseminationThe study has been approved by the Northwestern and Central Switzerland Ethics Committee (2020–00569) and it is being conducted in accordance with the Declaration of Helsinki and Good Clinical Practice. Study results will be disseminated through peer-reviewed journals and national and international scientific conferences.Trial registration numbersSNCTP000003904. NCT04491526.

Rate of Postoperative Urinary Retention After Anterior Compartment Prolapse Surgery: a Randomized Controlled Trial Comparing Early Versus Conventional Transurethral Catheter Removal

Purpose To compare the rate of postoperative urinary retention (POUR) after anterior prolapse surgery between early transurethral catheter removal (24 hours postoperatively) and our standard practice (on postoperative day 3)Methods We conducted a randomized controlled trial among patients undergoing anterior compartment prolapse surgery between 2020 and 2021 at a university hospital. Women were randomized into two groups. After removal, if the second void residual urine volume exceeded 150 mL, POUR was diagnosed and intermittent catheterization was performed. The primary outcome was the POUR rate. The secondary outcomes included urinary tract infection, asymptomatic bacteriuria (AB), time to ambulation, time to spontaneous voiding, length of hospitalization, and patient satisfaction.Results Sixty-eight women were enrolled. There were no significant differences in baseline characteristics, intraoperative blood loss, operative time, anesthetic modalities, opioid use, and complications. The overall POUR rate was 29.4%. The POUR rate in the conventional group was 18.2% higher than that in the early-removal group; however, this was not statistically significant. (32.4% vs. 26.5%, RR 0.82; 95% CI: 0.39–1.72). There was no significant difference between groups for postoperative AB rate (14.7 vs. 0%, p=0.053). The early-removal group had shorter lengths of hospital stay (1 day vs. 3 days, p<0.001) and 3.8 hours earlier time to ambulation (p=0.2), without significant differences in postoperative patient satisfaction. Conclusion Among patients undergoing anterior compartment prolapse surgery, early catheter removal was comparable in POUR rate to conventional treatment, with shorter hospitalization. Therefore, early transurethral catheter removal is preferable following anterior compartment prolapse surgery. Clinical trial registration number thaiclinicaltrials.org, TCTR20210309003, 09 March 2021, retrospectively registered.

Predictors of postoperative urinary retention after posterior spinal fusion for adolescent idiopathic scoliosis

Purpose To determine predictors for postoperative urinary retention in adolescents undergoing posterior spinal fusion for idiopathic scoliosis. Postoperative urinary retention affects almost every third adolescent after spinal fusion for idiopathic scoliosis. There are limited data regarding the risk factors of postoperative urinary retention in this patient group. Methods A retrospective study with prospectively collected urinary retention data from paediatric spine register with 159 consecutive patients (114 females, mean age 15.6 years, range 10–21 years) undergoing pedicle screw instrumentation for adolescent idiopathic scoliosis at a university hospital between May 2010 and April 2020. Postoperative urinary retention was defined as an inability to void after catheter removal and documented residual over 300 mL as confirmed using an ultrasound or by catheterization. Results Postoperative urinary retention was diagnosed in 33% (53 of 159) of the patients during hospital stay. Opioid amount on the day of catheter removal (OR 6.74 [95% CI: 2.47, 18.36], p < 0.001), male gender (OR 2.26 [95% CI: 1.01, 5.05], p = 0.048), and increasing weight (OR 1.04 [95% CI: 1.01, 1.07], p = 0.014) were associated with postoperative urinary retention. Mean opioid consumption on the day of catheter removal was 0.81 mg/kg (95% CI: 0.66, 0.96) in the retention group vs 0.57 mg/kg (95% CI: 0.51, 0.64) in the non-retention group, p < 0.001. Conclusions Higher total opioid consumption, opioid amount on the day of catheter removal, higher weight, and male gender increases the risk of postoperative urinary retention in adolescents with idiopathic scoliosis undergoing posterior spinal fusion.

Postoperative urinary retention D-r E. Rotthaus (Arch. F. Klin. Chir. Bd. 161. H. 2)

Dr. E. Rotthaus (Arch. F. Klin. Chir. Bd. 161. H. 2) recommends for postoperative urinary retention intravenous injection 1 eg. Piiocarpin'a + 0.3 mg Atropin'a. In the hands of the author, this method is safe and over 80% successful.

On the issue of subcutaneous use of pilocarpine in postoperative urinary retention

Postoperative, as well as postpartum ischuria is a very unpleasant complication, since all commonly used means are heat to the bladder, instillation of 10% boric glycerin into the bladder (Corbineau method), liq. kalii acetici per os, injections of 1.0-2.0 25% magnesiae sulfur, under the skin (Voytashevsky method), intravenous injections of 5.0-10.0 40% urotropin (according to V o g t'y) - often give refusal or induce urination after many hours and thus force the use of a catheter. As for catheterization, this method is recognized as fraught with complications and should be used, according to Dieterichs, only as an ultimum refugium.

Pilocarpine for postoperative urinary retention Lampert (Zentr. F. Chir., 1926, no. 8)

Pilocarpine in postoperative urinary retention, as shown by the clinical observations of Lampert a (Zentr. F. Chir., 1926, No. 8), provides excellent services: already a single injection into a vein of a 1.01% solution of pilocarpine (maximum single dose 0.02 , pro die 0.05 pure pilocarpine), even after a 24-hour delay, gives spontaneous urination in 5-15 minutes.