To clarify the causes of lower urinary tract symptoms afterprostatectomy， 38 cases with lower urinary tract symptoms after prostatectomy were studied retrospectively.The results showed of the 38 patients，detrusor dysfunction was observed in 55.2％（21／38），28.9％ being detrusor hyporeflexia，15.8％ being a combination of detrusor hyporeflexia and bladder outlet obstruction，and 10.5％ being detrusor over-activity.Bladder outlet obstruction was diagnosed in the remaining 44.8％，36.4％ diagnosed as bladder neck obstruction and 8.4％ as stricture of urethra.These suggested that the causes of lower urinary tract symptoms after prostatectomy were mainly detrusor dysfunction and bladder neck obstruction.It is therefore necessary to evaluate these patients with Urodynamics before reoperation.%对前列腺切除术后出现下尿路症状者38例进行尿动力学检查并分析。结果显示:38例中有逼尿肌功能障碍者21例，其中单纯逼尿肌反射低下11例，逼尿肌反射低下伴下尿路梗阻6例，逼尿肌过度活动4例；下尿路梗阻者17例，其中膀胱颈梗阻14例，尿道狭窄3例。认为逼尿肌功能障碍、膀胱颈梗阻是前列腺术后下尿路症状的主要原因，尿动力学检查可明确诊断，并为二次治疗的方法提供依据。
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