Abstract: Objective To explore and analysis the correlation between changes in posterior urethral ultrasound morphology and the occurrence of lower urinary tract symptoms caused by benign prostatic hyperplasia. Methods From August 2020 to May 2023, 92 cases of male patients with benign prostatic hyperplasia who were diagnosed and treated at General Surgery Department of Shangzhou District People's Hospital were selected as the case group, while the other 92 cases of healthy male patients who underwent physical examination at General Surgery Department of Shangzhou District People's Hospital were selected as the control group during the same period. The morphological changes of posterior urethra in the case group and the control group were detected, and the symptoms of lower urinary tract were recorded, and the correlation factors of lower urinary tract symptoms caused by benign prostatic hyperplasia were analyzed by Spearman. Results The abnormal rates of posterior urethral ultrasound morphology in the case group were 53.26%, while in the control group it were 5.43%.The abnormal rate of posterior urethral ultrasound morphology in the case group were significantly higher than that in the control group (P<0.05).The bladder outlet obstruction index and residual urine volume in the case group were significantly higher than those in the control group (P<0.05),and the maximum urine flow rate were also significantly lower than that in the control group (P<0.05). In the case group, Spearman analysis showed there were correlation between abnormal ultrasound morphology of the posterior urethra and bladder outlet obstruction index,residual urine volume, maximum urine flow rate(P<0.05).Multivariate logistic regression analysis showed that the abnormal ultrasonic morphology of posterior urethra in BPH patients affected the bladder outlet obstruction index,residual urine volume and maximum urine flow rate(P<0.05). Conclusion Patients with benign prostatic hyperplasia often exhibit abnormal posterior urethral ultrasound morphology, accompanied by abnormal bladder outlet obstruction index, residual urine volume, and maximum urine flow rate. There are correlation between changes in posterior urethral ultrasound morphology and the occurrence of lower urinary tract symptoms caused by benign prostatic hyperplasia.

Key words: benign prostatic hyperplasia, ultrasound morphology of the posterior urethra, bladder outlet obstruction index, residual urine volume, lower urinary tract symptoms, relativity