Ultrasonic Estimation of Bladder Weight in Men with Infravesical Obstruction

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The aim of the present study was to develop a noninvasise method sensitive to detect infravesical obstruction. A new method for the measurement of bladder weight was originally developed as a measure of bladder hypertrophy. Using a 7.5MHz transabdominal probe, ultrasonically estimated bladder Weight (UEBW) was calculated from the thickness of the bladder wall, assuming a spheric bladder. In the experimental study there was a statistically significant correlation between the actual bladder weight of 10 cadaver bladders and the UEBW calculated. In the clinical study UEBW was calculated in 104 men (50 to 89 years old, average age 69). The UEBW was signinificantly greater in men with infravesical obstruction than that in men without it. Additionally, the high UEBW in 5 patients with BPH decreased to a nomal control level after operation. In this study, UEBW and pressure flow studies were performed in 65 men (45 to 89 years old, average age 71) with urinary symptoms and the ability of UEBW to predict infravesical obstruction was tested. As a result, a cutoff value of 35gm. for UBEW revealed a diagnostic accuracy of 86.2% for infravesical obstruction and the UEBW correlated significantly with the Abrams-Griffiths number, urethral resistance factor and the schafer grade of obstruction. It was presumed that UEBW is promising as a reliable predictor of infravesical obstruction and is particularly useful for monitoring therapeutic effects in men with urinary symptoms caused by infavesical obstruction.