尿动力学参数多元分析对良性前列腺增生所致膀胱出口梗阻的诊断价值

目的:探索用于诊断良性前列腺增生患者合并膀胱出口梗阻(BOO)的函数模型,绘制能用于判断不同的逼尿肌收缩力状况下尤其是逼尿肌收缩力减弱时BOO情况的曲线。方法:回顾性分析131例患者尿动力学的检查结果和临床资料,通过多因素Logistic回归分析的方法,建立函数模型,根据此模型绘制BOO情况判断的曲线。采用ROC曲线分析的方法,确定我们的函数模型和相应曲线诊断BOO的界值。结果:建立的函数模型为BOO指数(BOO I)=5.03×剩余分数+0.04×最大尿流率时的逼尿肌压力-0.20×最大尿流率-0.91+α(当压力流率曲线为低压低流型时α=0;为高压低流型时α=1.42;为高压高流型时α=-7.30)。确定的BOO I诊断BOO的界值为0.36。验证该界值时灵敏度、特异度、阳性预测价值、阴性预测价值分别为85.7%、91.7%、96%、73.3%。结论:我们建立的函数模型BOO I计算公式较为简单,可推测出患者出现BOO概率的大小。诊断标准具有良好的灵敏度和特异度。我们绘制的诊断曲线能够把表现为低压低流型患者中有BOO的患者鉴别出来使之从解除梗阻的手术中获得益处。

Diagnostic Value of Urodynamic Parameters Multianalysis in the Evaluation of Bladder Outlet Obstruction Resulting from Benign Prostatic Hyperplasia

OBJECTIVE: To construct a function model that can be used in the diagnosis bladder outlet obstruction (BOO) resulting from benign prostatic hyperplasia, and to develop a diagram allowing the judgement of bladder outlet for patients with different detrusor contractility, especially with impaired one. METHODS: Urodynamic and clinical data of 131 men were analyzed retrospectively. By Logistic analysis, a function model was constructed. Based on the model, a diagram allowing the evaluation of bladder outlet was drawn. The cutoff point for diagnosing BOO with the function model and the curve was confirmed by ROC curve analysis. RESULTS: The function model (BOOI) was obtained by the formula 5.03 x residual fraction + 0.04 x PdetatQmax - 0.20 x Qmax - 0.91 + alpha (alpha = 0 for those with low pressure-low flow on P-FS, alpha = 1.42 for high pressure-low flow, alpha = -7.30 for high pressure-high flow). The cutoff point for BOOI diagnosing BOO was 0.36. When validated, the sensitivity, specificity, positive predictive value, and negative predictive value were 85.7%, 91.7%, 96.0% and 73.3% respectively. CONCLUSION: The BOOI, with an easy calculation mode, could predict the probability of BOO. The sensitivity and specificity of the criterion for the diagnosis of BOO were satisfactory. The curve we drew could help to differentiate the obstructed men with low pressure-low flow and thus benefit them by surgical relief of their obstruction.