With the help of the Doppler Ultrasound we have measured the radial artery blood flow of 20 healthy volunteers and the fistula flow of 40 uraemic patients. The measurements were made at rest and repeated one, three and five minutes after initiation of hand exercise, and one minute after the exercise had finished.
Radial artery mean flow increased significantly with the exercise (p < 0.001); radial arteries with greater baseline flow had less flow increase (p < 0.002). However, we were not able to demonstrate any fistula flow increase with the hand exercise.
Therefore, we conclude that there is no benefit in advising uraemic patients to squeeze a rubber ball which, otherwise, supposes an unnecessary preoccupation for these patients.
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