Objective: The aim of this work is to study the resistive index (RI) of prostatic
blood fl ow by transrectal power Doppler sonography in benign prostatic hyperplasia
(BPH) to determine its correlation with other parameters of BPH.
Materials and Methods: Eighty-two male patients aged 52-86 years with lower
urinary tract symptoms (LUTS) due to BPH were included in the study. Patients
with prostate cancer, neurogenic bladder, or with other pathology (e.g. prostatitis,
bladder stone) were excluded from the study. All patients were evaluated by full
history including Internatinoal Prostate Symptoms Score (IPSS), general and local
examination (DRE), neurologic examination, urofl owmetry, laboratory investigations
including urine analysis, routine laboratory tests and serum prostate specifi c
antigen (PSA). Transrectal ultrasonography was used to calculate the total prostatic
volume. Transrectal Power Doppler Ultrasound (PUD) was used to identify the capsular
and urethral arteries of the prostate and to measures the RI value.
Results: The mean prostate volume was 75.1 ± 44.7 g. The mean RI of the right and
left capsular arteries were 0.76 ± 0.06 and 0.76 ± 0.07, respectively. The mean RI
of the urethral arteries was 0.76 ± 0.08. There was a high signifi cative correlation
between the increase of the RI of the right and left capsular and urethral arteries and
the degree of obstruction (P value < 0.001), severity of symptoms (P value < 0.001)
and also the prostatic volume (P value < 0.001).
Conclusion: Resistive index of the prostatic blood fl ow can be applied as an easy
and non-invasive tool to evaluate the lower urinary tract obstruction due to BPH.