Comparison of Color Doppler Ultrasound and Ankle-Brachial Pressure Index Measurement in Peripheral Vascular Diseases

Peripheral vascular diseases (PVD) are a group of common degenerative (organic) and vasospastic (functional) disease processes that result in significant morbidity and are strong predictors of subsequent mortality. It is diagnosed by definitive history of intermittent claudication or if one or more of peripheral pulses are absent in one or both lower limbs. A variety of non-invasive techniques, viz., ankle-brachial pressure index (ABPI) test and color Doppler imaging, are available to diagnose the presence of PVD as well as to localize areas of stenosis, assess severity of disease, and follow patients for disease progression or response to therapy. Therefore, the focus of this study is to compare color Doppler ultrasound and ABPI individually and in combination in diagnosing cases of peripheral vascular diseases, considering CT angiography the gold standard investigation. Patients were assessed on the basis of history; clinical examination and relevant investigations done were noted in the data sheet according to the proforma including the Edinburgh Claudication Questionnaire. Comparison of color Doppler ultrasound and ankle-brachial pressure index measurement in peripheral vascular diseases was determined using relevant statistical tests. The sensitivity, specificity, positive predictive value, and negative predictive value were calculated for comparison of ABPI and color Doppler imaging with CT angiography. Color Doppler ultrasound proved to be a better modality as compared to the ankle-brachial pressure index for diagnosis of peripheral vascular disease, considering CT angiography the gold standard investigation.