Estimation of Bladder Volume Using Portable Ultrasound in Clam Enterocystoplasty Patients

Abstract

Purpose We evaluated portable ultrasound for the measurement of residual volume following clam enterocystoplasty. Materials and Methods Bladder volumes were measured in 25 clam enterocystoplasty patients using a portable ultrasound machine and compared with urethral catheter volumes. A similar study was performed on a control group of 50 patients with normal bladder architecture. Results There was a close correlation (r = 0.978) between ultrasound and catheter volumes in the control group with a regression line slope of 0.88. There was an equally close correlation (r = 0.960) in the clam enterocystoplasty group but the regression line slope was lower at 0.65, which suggests an underestimation of the true bladder volume. There was a significant difference (p less than 0.0001) between the ultrasound-to-catheter volume ratio in the 2 groups. Conclusions Portable ultrasound is inaccurate for the measurement of residual bladder volume in clam enterocystoplasty patients.