flow-mediated vasodilation
Non-invasive ultrasound technique measuring endothelial function by assessing arterial dilation response to increased blood flow.
Full Definition
Flow-mediated vasodilation (FMD) is a non-invasive method for evaluating endothelial function using high-resolution ultrasound. The technique involves measuring the change in arterial diameter following a period of induced ischemia, typically achieved through blood pressure cuff occlusion. The magnitude of vasodilation reflects the endothelium's ability to produce nitric oxide in response to shear stress. This test serves as a surrogate marker for cardiovascular risk and endothelial health, with impaired FMD associated with increased cardiovascular events.
Usage
Usage note: Primarily used in research settings and specialized vascular laboratories.
In Context
- "Flow-mediated vasodilation testing revealed impaired endothelial function in the diabetic cohort." — Research study report
- "The patient's flow-mediated vasodilation was 8%, indicating normal endothelial function." — Vascular laboratory report