Diagnosing bladder outlet obstruction among benign prostate hyperplasia patients by combination of noninvasive methods

Objective To diagnosing bladder outlet obstruction( BOO) among benign prostate hyperplasia ( BPH) patients by combination of noninvasive methods. Methods The study involved 70 patients who visited our department with lower urinary tract symptom ( LUTS ) suggestive BPH. All the patients were evaluated with the International Prostate Symptom Score ( IPSS ) ,serum prostate specific antigen ( PSA ) level,total prostate volume ( TPV) ,transitional zone volume( TZV) ,transitional zone index( TZI) ,intravesical prostatic protrusion( IPP) and urodynamic studies. The urodynamic results were used to divide patients into 2 groups with and without BOO. Results Qmax in the group with BOO was significantly lower than it in the group without BOO. TPV,TZV,TZI, IPP,Qmax were all significantly associated with BOOI,BOO diagnosing index was calculated by logistics regression: BDI = 0. 025 × TPV - 0. 457 × Qmax + 3. 611. AUC of BDI was 0. 876. Conclusion BDI could diagnose BOO with considerable accuracy,which could help doctors select treatment of BPH patients.