Arterial, Atrial and Venous Pressure Changes in the Presence of an Arteriovenous Fistula

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Abstract
Observations on the pressures in the right atrium, venous bed and femoral artery of dogs with femoral a-v fistulas demonstrate that upon opening the fistula (1) the atrial pulse pressure rises minimally, if at all; (2) the pressure in the artery proximal to the fistula falls and (3) the venous pressure rises markedly at the level of the fistula. The rise in venous pressure becomes less as the measurements are made further up the venous bed toward the atrium. Evidence for a greater emptying of the heart when the ejection is against a decreased arterial pressure suggests the sequence of events which provide the increase of cardiac output upon opening the a-v fistula.

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