Abstract
The flow velocity in 77 surgically created, patent arteriovenous fistulas in patients was measured with a 5 MHz continuous wave directional Doppler (Parks 906). Ultrasound measurement of the diameter of the brachial artery feeding 56 of the fistulas were at the same time making possible measurements of the flow volume. Comparison between 5 and 10 MHz Doppler demonstrated .apprx. 10% lower flow values with the latter equipment. A normal range of flow velocity values (30-70 cm/s) in patent arteriovenous fistulas is suggested.