100 End Diastolic Velocity versus Resistive Indices in Predicting Better Clinical Response Using Penile Doppler Ultrasound for Patients with Erectile Dysfunction

Introduction: Erectile dysfunction (ED) is a common disorder affecting millions of men worldwide. Penile Doppler (PD) is a useful modality to assess the functional underlying cause of the ED. PD can be used for evaluating different parameters of an erection including peak systolic velocity (PSV), End diastolic velocity (EDV), Resistive Indices (RI) and cavernosal artery diameter (CAD). These measurements can aid the physician in diagnoses and treatment. The objective of this study was to determine whether RI or EDV better predicts clinical response on PD for erectile dysfunction evaluation. Between July 2008 and February 2013, 472 consecutive patients were evaluated for ED with a PD ultrasound of which 465 patients had complete data. This cohort was then divided into three groups based on clinical response: 1) Clinical response 0 degrees (n=112, 24%), 2) Clinical response 0-45 degrees (n=226, 49%), 3) Clinical response greater than 45 degrees (n=127, 27%). Interquartile Range (IQR), Mean, median and Standard Deviation (SD) were then calculated for certain demographic data and PD parameters including EDV and RI (calculated (PSV-EDV)/PSV). Both parameters were calculated by best response regardless of cavernosal side. Demographic and PD ultrasound parameters between the groups were compared using descriptive statistics.