How does VENDYS measure vascular reactivity?
A5. VENDYS monitors, records, and analyzes fingertip temperature, which serves as a surrogate marker of blood flow changes that result from vascular reactivity. The VENDYS test begins with an automated blood pressure measurement in the left arm, followed by a period of suprasystolic cuff occlusion of the right arm (usually 5 minutes). During the cuff occlusion, fingertip temperature in the right hand falls because of the absence of warm circulating blood. The occlusion of blood flow elicits a vasodilatory response in the ischemic area. Once the cuff is released, blood flow rushes into the forearm and hand, causing a temperature rebound (TR) in the fingertip which is directly proportional to the reactive hyperemia response. The higher the temperature rebound, the better the vascular reactivity.
