[Doppler ultrasound evaluation of blood flow direction in distal occlusion of arteries of the lower leg].

It is necessary to observe the direction of the blood flow for measurement of the ankle pressure by the Dopplermethod. Obliteration of the ankle pressure by the Dopplermethod. Obliteration of the anterior tibial artery can be compensated by collaterals from the posterior tibial artery. Through this the blood flow is reversed in the dorsalis pedis artery. If this possibility is disregarded, the pressure of the anterior tibial artery will yield false data. The situation of the blood flow can be clarified by a compression test of the posterior tibial artery. This also applies to obliterations of the other arteries of the ankle.