Bis K G, Slovis T L
Department of Radiology, Children's Hospital of Michigan.
Pediatr Radiol. 1990;20(6):457-60. doi: 10.1007/BF02075208.
The accuracy of ultrasonography in assessing the bladder volume in 13 children with normal bladder contours was determined using the formula D x H x W (depth x height x width) with a mean error of 15.7%. This formula tends to overestimate the bladder volume in these patients. Multiplication by a correction factor of 0.9 yields a mean error of 11.5%. The accuracy of this evaluation is not dependent upon the bladder volume as the mean error was the same in those children whose bladder volume was either less than or greater than 150 cc. In addition, the accuracy of ultrasonography in assessing bladder volume was evaluated in 7 patients with an abnormal bladder contour (trabeculation, diverticula, etc.); mean error was 14.7%. In these 7 patients there was no predictable under or overestimation of bladder volume. In the children with abnormal bladder contours on ultrasound, the correction factor of 0.9 should not be used, as it does not add to the accuracy of the procedure in any individual patient. This technique is still valuable, however, in children with an abnormal bladder for it allows estimation of the extent of emptying without invasive catheterization.
通过使用公式D×H×W（深度×高度×宽度）测定了13例膀胱轮廓正常儿童超声检查评估膀胱容量的准确性，平均误差为15.7%。该公式往往会高估这些患者的膀胱容量。乘以0.9的校正因子后平均误差为11.5%。这种评估的准确性不依赖于膀胱容量，因为膀胱容量小于或大于150 cc的儿童的平均误差相同。此外，对7例膀胱轮廓异常（小梁形成、憩室等）的患者进行了超声检查评估膀胱容量的准确性评估；平均误差为14.7%。在这7例患者中，膀胱容量没有可预测的低估或高估情况。对于超声检查显示膀胱轮廓异常的儿童，不应使用0.9的校正因子，因为它不会提高任何个体患者检查的准确性。然而，这项技术对于膀胱异常的儿童仍然有价值，因为它无需侵入性插管就能估计排空程度。
