ESPU Congress 2018 - Abstract Book

163 11–14 APRIL, 2018, HELSINKI, FINLAND 08:49–08:52 S21-9 (PP) ★ INITIAL EXPERIENCE OF BLADDER COMPLIANCE MEASUREMENT USING ULTRASOUND ELASTOGRAPHY IN NEUROGENIC BLADDER Young Jae IM and Kwanjin PARK Seoul National University Children's Hospital, Department of Pediatric Urology, Seoul, REPUBLIC OF KOREA PURPOSE Bladder compliance is most important factor for treatment and prognosis of neurogenic bladder. However, we could evaluate bladder compliance using only urodynamic study. We investigate the value of ultrasound elastography to measure bladder compliance. MATERIAL AND METHODS We prospectively enrolled 8 patients in this study from November 2016 to June 2017. Underlying disease are meningomyelocele (2), lipomeningomyelocele (4), spinal tumor (1) and cord regression syndrome (1). We measured bladder compliance using urodynamic study andultrasound elastog- raphy simulatenously. RESULTS 4 patients were male, mean age at urodynamic study was 8.9(5–15) years. We divided into low compliance group (4 patients, less than 10 ml/cmH 2 O in urodynamic study) and normal compliance group (4 patients, more than 20 ml/cmH 2 O). Mean compliance of low compli- ance group was 5.1(1.7–8.9) ml/cmH 2 O We compared Young’s modulus measured byultrasound elastography between two groups accord- ing to % of bladder filling of expected capacity for age (0 %, 25 %, 50 %, 75 %, 100 %). In initial and 25 %, there were no significant differene between low compliance group (9.05 kPa, 13.12 kPa) and normal group (9.4 kPa, 7.74 kPa) (P=0.941, 0.211). Young’ modulus gradually increased until full filling status in low compliance group (50 % 13.34 kPa, 75 % 15.46 kPa, 100 % 22.03 pKa), but maintained in normal group (50 % 4.85 kPa, 75 % 5.53 kPa, 100 % 8.51 kPa). There were significant differences between two groups (50 % P=0.006, 75 % P=0.003, 100 % P=0.015). CONCLUSIONS Young’s modulus measured by ultrasound elastography is closely related to bladder compliance. When bladder compliance is higher than 10 kPa, we should consider that bladder compliance is significantly decreased. We expect that ultrasound elastography would substitute the major role of urodynamic study because of noninvasiveness and usability.