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Aim: The present study was undertaken with the aim to standardize ultrasound measured urinary bladder wall thickness (UMUBWT) as an additional routine noninvasive test to assess the bladder outflow obstruction (BOO) and to monitor the therapeutic effects of BOO in follow-up after surgical correction of obstruction. Methods: This is an interventional study (pretest-posttest type of clinical trial) conducted between December 2012 to May 2015 where sample size was 55 and sampling technique was purposive. In BOO patient transabdominal sonography was performed using a 7.5 MHz. probe. The thickness of the anterior bladder wall at the midline was measured in both preoperative and postoperative period ( three months after operation) at 3 points approximately 1 cm apart and the average value was recorded. Results: In this study age range was 21-73 years with mean±SD of age was 48.76±15.08 years. In BOO patient preoperative UMUBWT was 0.51 ± 0.16 cm and which reduced to 0.26 ± 0.05 cm three months after surgical correction of obstruction. Conclusion: UMUBWT is a noninvasive, cheap and easily available additional diagnostic tool for detecting BOO as well as it can measure the therapeutic effects in postoperative period. Bangladesh J. Urol. 2019; 22(2): 188-193 1. Assistant Professor, Shaheed Tajuddin Ahmed Medical College, Gazipur. 2. Assistant Professor, Shaheed Tajuddin Ahmed Medical College, Gazipur. 3. Assistant Professor, Colonel Abdul Malek medical college, Manikgonj. 4. Assistant Professor, Sheikh Hasina Medical College, Jamalpur. 5. Assistant Professor, Shaheed Tajuddin Ahmed Medical College, Gazipur. 6. Assistant Professor, Shaheed Tajuddin Ahmed Medical College, Gazipur. Correspondences: Mohammad Khairuzzaman, Assistant Professor, Shaheed Tajuddin Ahmed Medical College, Gazipur. Received: 05 February 2019 Accepted: 10 May 2019 Introduction: It is a well known fact that infravesical obstruction is followed by compensatory hypertrophy of bladder detrusor in men[1,2] and experimental animals, such as rats[3,4], rabbits[5,6] and dogs[7]. Bladder wall thickness increases due to smooth muscle hypertrophy and deposition of connective tissue[8]. Sonographic measurements of the bladder wall have shown a low intraand inter-observer variability, which makes this technique suitable for the routine use in patient[9]. Urodynamic studies still remain the ‘gold standard’ for diagnosis of infravesical obstruction9. Assessment of the urinary bladder wall thickness by ultrasound has been shown to be sensitive and non-invasive tool for assessing the infravesical obstruction[10]. Though now a days pressure flow studies are recognized as the gold standard for the diagnosis of bladder outflow obstruction, their clinical use is limited due to invasive nature of the procedure[11] and limited availability, and ultrasound estimated bladder wall thickness can predict bladder outflow obstruction in a non-invasive way[12]. So in view of an simple auxiliary technique in association with other noninvasive investigations of 188 Bangladesh J. Urol. 2019; 22(1): 188-193

Effectiveness of Ultrasound Measured Urinary Bladder Wall Thickness as a = Diagnostic and Follow up Tool in Men With Bladder Outlet Obstruction