This study included 87 cases of BPH with OAB , with a disease course > or = 3 months , daily urination > or = 8 times , nocturnal urination > or = 2 times , urine volume < 200 ml per time , International Prostate Symptom Score ( IPSS ) > or = 8 , OAB symptom score ( OABS ) > or = 3 , quality of life score ( QOL ) > or = 3 , post-void residual ( PVR ) < or = 100 ml , maximum urinary flow ( Qmax ) > or = 5 ml/s , prostate weight 25-50 g , and PSA < 4 microg/L .