Transrectal doppler ultrasound during prostate biopsy: clinical utility and limitations.

OBJECTIVE To determine the clinical utility and limitations of guided prostate biopsy Power Doppler in patients with elevated serum PSA levels. MATERIALS AND METHOD Prospective study. From April 2012 to May 2013, 111 men over 45 years of age with serum PSA level greater than 4.0ng/dl who underwent a transrectal prostate biopsy were included. The hypoechoic nodules in the peripheral region were considered positive on the gray scale. Subsequently, the study was conducted with the Power Doppler, where the vascularization of suspicious images was analyzed for sampling. In addition, samples were taken from the suspected areas when performing the digital rectal examination. We calculated sensitivity, specificity, positive predictive value and negative predictive value of the three tests (digital rectal examination, standard gray scale ultrasound and power Doppler). RESULTS Prostate cancer was diagnosed in 48 of the 111 patients (43%). Fifty-nine cases (53%) were defined as positive with the Power Doppler. Of these, 39 (66%) corresponded to a diagnosis of prostate adenocarcinoma. The Power Doppler was positive in 39 cases of the 48 patients diagnosed with cancer and the gray scale ultrasound was positive in 31 cases. Overall sensitivity of the power Doppler was 81%, specificity 68%, PPV 66% and NPV 82%, which was higher compared to the other methods (P<.05). CONCLUSION Currently, prostate biopsy using Power Doppler does not seem to identify prostate cancer with sufficient accuracy to omit the guided systematic biopsy gray scale, the combined use of these methods being preferable.