Which location is likely to exhibit an abnormally high resistance waveform?

An abnormally high resistance waveform is typically observed in areas proximal to an occlusion. This occurs due to the compensatory mechanisms that the body employs in response to reduced blood flow. When a vessel is narrowed or obstructed, the flow dynamics change upstream of the occlusion. The increased resistance upstream leads to a higher peak and more pulsatile waveform, reflecting the decreased volume of blood that can pass through the narrowed segment.

In normal physiological conditions, resistance is lower in areas where there is unrestricted blood flow, such as at healthy vessel segments or near the heart, where blood flow is higher and more continuous. In contrast, distal to an occlusion, the waveform might exhibit lower resistance characteristics because of the effects of the occlusion itself, which typically leads to reduced flow velocity and altered hemodynamics.

Thus, the location proximal to an occlusion demonstrates an abnormally high resistance waveform due to the interplay of hemodynamic changes linked with vascular occlusions.