We studied 33 patients with acute urinary retention due to benign prostatic hyperplasia for evaluating the recovery of the detrusor muscle function and its affecting factors through the serial urodynamic studies prospectively. And ninety nine
patients
were studied for risk factors of acute urinary retention retrospectively. Among the 33 patients studied prospectively, detrusor contraction at immediate decompression was observed in 20 cases(60.7%) and was not observed in 13 cases (39.3%), and
there
was statistically significant difference in the retained volume and duration of retention between two groups. In 10 cases of non-contraction group at immediate decompression, serial urodynamic studies showed that detrusor contraction recovered
within 2
days in 4 cases, but in 6 cases no detrusor contraction was found upto 5 days. Overall, detrusor function recovered in 80% of patients within 2 days. Among the patients studied for risk factors, hesitancy and interruption were the most common
symptoms
whereas urgency and urge incontinence were the least common. In conclusion, it is thought that acute urinary retention due to benign prostatic hyperplasia is resulted from temporary or permanent loss of detrusor muscle function due to
overdistension,
and the degree of retention duration and retained volume expressly affect the severity of loss of detrusor muscle function. The risk of acute urinary retention is higher in benign prostatic hyperplasia patients with obstructive symtoms rather
than
irritative symptoms.
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