Zerin J M, Chen E, Ritchey M L, Bloom D A
Department of Radiology, C. S. Mott Children's Hospital, Ann Arbor, MI 48109-0252.
Radiology. 1993 Jun;187(3):803-6. doi: 10.1148/radiology.187.3.8497634.
To assess the reliability of a frequently used formula for calculating bladder capacity in children, bladder capacity was measured prospectively at voiding cystourethrography in 274 consecutive healthy infants and children. Bladder volume index (BVI) was then calculated by dividing the measured capacity by the predicted capacity. Bladder capacity increased dramatically after 18 months and reached a plateau between 3 and 4 months of age, after which there was no further significant increase in capacity until approximately 9 years. BVI abruptly increased from 1.03 in children aged less than 18 months to 1.50-1.60 in children aged between 18 months and 4 years (P < or = .0001). Because bladder capacity increases sharply during infancy and early childhood and levels off once toilet training is complete, linear models used to predict bladder capacity on the basis of age alone significantly underestimate bladder capacity in infants and younger children.
为评估一种常用的儿童膀胱容量计算公式的可靠性，对274例连续的健康婴幼儿及儿童在排尿性膀胱尿道造影时前瞻性测量膀胱容量。然后用测量的容量除以预测容量来计算膀胱容量指数（BVI）。膀胱容量在18个月后急剧增加，并在3至4岁时达到平台期，此后直到约9岁容量没有进一步显著增加。BVI在18个月以下儿童中为1.03，在18个月至4岁儿童中突然增加到1.50 - 1.60（P≤0.0001）。由于婴儿期和幼儿期膀胱容量急剧增加，且一旦完成如厕训练就趋于平稳，仅基于年龄预测膀胱容量的线性模型会显著低估婴幼儿的膀胱容量。
