Department of Urology at China Rehabilitation Research Centre, Rehabilitation School of Capital Medical University, Beijing, China.
Beijing Key Laboratory of Neural Injury and Rehabilitation, Beijing Institute for Brain Disorders, Beijing, China.
Neurourol Urodyn. 2019 Feb;38(2):653-659. doi: 10.1002/nau.23883. Epub 2019 Jan 8.
To compare the accuracy of using a bladder scanner to measure bladder volume through intermittent catheterization (IC) in patients and to introduce the Bladder Deformation Index (BDI) to develop a correction method.
Bladder volume was assessed by a nurse with the scanner. A second nurse catheterized the patient's bladder. A third nurse measured the urine volume in a 500-mL or 1000-mL graduated cylinder.
Sixty one patients were included and 590 pairs of data were obtained. The mean bladder volume measured using a scanner and IC was (332.3 ± 156.1) mL and (339.1 ± 158.8) mL. The mean absolute difference was 30.8 mL. The correlation coefficient was 0.929. Patients were classified into 2 groups depending on whether they had undergone augmentation cystoplasty. The mean absolute difference was 109.2 and 20.4 mL. The correlation coefficient was 0.712 and 0.981. According to the BDI, bladders can be classified into 3 groups. The mean absolute difference was 21.9, 60.4, and 109.4 mL. The correlation coefficient was 0.970, 0.839, and 0.783. The linear regression equations of Grade I and Grade II were Y = 1.11X + 3.1 and Y = 0.76X + 161.5.
The results showed that bladder shape plays a critical role in accuracy which is inversely associated with BDI. This degree of accuracy is sufficient; especially measurement adjusted using the linear regression equation in patients with high BDI. However, although the preliminary results of the study are promising, a large-scale prospective study should be needed to address the validation of the data in the future.
比较使用膀胱扫描仪通过间歇性导尿（IC）测量膀胱容量的准确性，并引入膀胱变形指数（BDI）以开发一种校正方法。
由一名护士使用扫描仪评估膀胱容量。第二位护士对患者的膀胱进行导尿。第三位护士使用 500 毫升或 1000 毫升刻度量筒测量尿液量。
共纳入 61 例患者，获得 590 对数据。使用扫描仪和 IC 测量的平均膀胱容量分别为（332.3±156.1）mL 和（339.1±158.8）mL。平均绝对差值为 30.8mL。相关系数为 0.929。根据患者是否接受过膀胱扩大术，将患者分为 2 组。平均绝对差值为 109.2 和 20.4mL。相关系数为 0.712 和 0.981。根据 BDI，可将膀胱分为 3 组。平均绝对差值分别为 21.9、60.4 和 109.4mL。相关系数分别为 0.970、0.839 和 0.783。I 级和 II 级的线性回归方程分别为 Y=1.11X+3.1 和 Y=0.76X+161.5。
结果表明，膀胱形状在准确性方面起着关键作用，而准确性与 BDI 呈反比。这种准确度足以满足需求；尤其是在 BDI 较高的患者中，使用线性回归方程进行测量调整。然而，尽管研究的初步结果很有希望，但未来仍需要进行大规模的前瞻性研究来验证数据的有效性。
