INDICATION, TECHNIQUE AND INTERPRETATION OF ARTERIAL DOPPLER ULTRASONOGRAPHY

Doppler sonography is one of the most important diagnostic tools for a ngiologists and vascular surgeons, and also for general practitioners with an interest in vascular disease. It can be carried out easily and at low cost and at the same time provides reproducible, quantitative data on with further diagnostic and therapeutic decisions can be based . First, systolic arterial pressure in the anterior and posterior tibi al and in the peroneal arteries are measured, with the Doppler probe p laced at ankle level. A cuff is wrapped around the lower leg and infla ted until the Doppler signal disappears and then deflated. The highest value measured in each leg is termed ''ankle pressure''. Division of the latter by systolic brachial pressure results in the so-called ''an kle-brachial-index'' or ''ABI''. Ankle pressure and ABI correlate well with clinical findings. In normal individuals, the ABI is greater tha n 1. In claudicators, it ranges between 0.3 and 0.9, in patients with resting pain between 0.1 and 0. 5 and with ischemic tissue loss betwee n 0.0 and 0.2. After angioplastic or surgical revascularisation proced ures, a fall of the ABI by 0.15 or more is an indication of relevant h emodynamic deterioration and therefore calls for further investigation by arteriography or colour duplex sonography.