[Clinical significance of parameters of prostate volume measured by transabdominal ultrasonography in evaluating bladder outlet obstruction].

Objective: To explore the correlation between the parameters of prostate volume (PV) measured by transabdominal ultrasonography and urodynamic results in diagnosing bladder outlet obstruction (BOO).

Methods: 112 BPH patients aged 45-85 underwent transabdominal ultrasonography to measure the superior-inferior diameter (R1) anterior-posterior diameter (R2), and left-right diameter (R3). Urodynamic examination was conducted to record the maximum flow rate (Qmax), detrusor pressure at maximum urinary flow rate (Pdet. Qmax), and detrusor pressure at minimum urinary flow rate (Pdet. Qmin), Schafer grading and international prostate symptom score (IPSS) scores were calculated. Correlation analysis was performed.

Results: The PV, R1, R2, and R3 were (48 +/- 29) ml, (4.3 +/- 1.0) cm, (3.7 +/- 0.9) cm, and (5.2 +/- 0.8) cm respectively. The Qmax, Pdet. Qmax, Schafer score, and IPSS score were (6.2 +/- 3.2) ml/s, (56 +/- 41) cm H2O, 3.1 +/- 1.8 (0-6) and 23 +/- 2 (15-31) respectively. Logistic regression analysis showed that R1 (OR = 22.662, P = 0.000), PV (OR = 0.946, P = 0.008) , and Qmax (OR = 0.760, P = 0.013) were positively correlated with Schafer grading value.

Conclusion: The parameters of PV measured by transabdominal ultrasonography are reliable to diagnose BOO due to BPH.