Which condition is characterized by a high diastolic flow in a proximal artery during AVF?

A high diastolic flow in a proximal artery during the presence of an arteriovenous fistula (AVF) is indicative of the increased blood flow resulting from the connection between the high-pressure arterial system and the low-pressure venous system. When an AVF is established, it leads to a significant shunting of blood flow. This shunting causes alterations in the normal hemodynamic patterns, particularly observed in arterial flow—the flow may become more continuous with elevated diastolic flow due to the sustained pressure and volume from the arterial system.

The increased blood flow is primarily a response to the volume overload in the distal arterial branch as blood is diverted from the artery to the vein. Such changes are not typically seen with conditions like chronic venous insufficiency, which would not specifically cause an increase in proximal arterial diastolic flow; rather, it leads to other pathological changes in the venous system.

In normal arterial flow, diastolic flow is expected to be lower compared to systolic flow, and would not exhibit the elevated diastolic values that are characteristic when an AVF is present. Similarly, arterial occlusion would generally result in reduced flow or changes in waveform patterns, but not an elevation in diastolic flow. Therefore