Vasodilation Assay
Vasodilation Assay - Related Videos
07:46
Assessing Endothelial Vasodilator Function with the Endo-PAT 2000
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Cited by 165 •
2010
A noninvasive procedure to assess endothelial function is demonstrated using the Endo-PAT 2000.
08:09
Vasodilation of Isolated Vessels and the Isolation of the Extracellular Matrix of Tight-skin Mice
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Cited by 1 •
2017
We describe the isolation of cardiac extracellular matrix from C57Bl/6J control mice, tight-skin mice, and tight-skin mice treated with the IRF5 inhibitory peptide. We also describe the vasodilation studies on the isolated vessels from C57Bl/6J, tight-skin mice and tight-skin mice treated with the IRF5 inhibitory peptide.
01:23
Antihypertensive Drugs: Vasodilators
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2024
Vasodilators, primarily affecting the smooth muscles within arterial and venous walls, are commonly used for hypertension treatment. Medications such as minoxidil and hydralazine primarily target arteries and arterioles, while sodium nitroprusside acts on arterioles and venules. Minoxidil, functioning as a prodrug, is metabolized by hepatic sulfotransferase into its active form, minoxidil sulfate, after oral administration. This metabolite binds to the sulfonylurea receptor (SUR) component of...
08:42
Ultrasound Assessment of Endothelial-Dependent Flow-Mediated Vasodilation of the Brachial Artery in Clinical Research
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Cited by 42 •
2014
Endothelial dysfunction is associated with numerous disease states and is predictive of adverse cardiovascular events in humans. Flow-mediated vasodilation (FMD) is a non-invasive ultrasound method of evaluating endothelial function. Methodological choices and operator experience may affect results. A systematic approach to FMD in human studies is discussed here.
08:22
Combined Intravital Microscopy and Contrast-enhanced Ultrasonography of the Mouse Hindlimb to Study Insulin-induced Vasodilation and Muscle Perfusion
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Cited by 4 •
2017
Insulin-induced vasodilation regulates muscle perfusion and increases the microvascular surface area (microvascular recruitment) available for solute exchange between blood and tissue interstitium. Combined intravital microscopy and contrast-enhanced ultrasonography is presented to simultaneously assess insulin's action at the larger vessels and the microcirculation in vivo.
FAQs
The assay links exposure to a test compound or physiological signal with the vessel’s relaxation response. A stronger widening response indicates that the vascular tissue can respond effectively under the tested conditions, whereas a limited response may signal impaired endothelial performance. This makes the method useful for examining functional changes associated with cardiovascular health and vascular disease.
Vasodilation assays can quantify relaxation either as a change in vessel diameter or as a change in contractile tension. Diameter directly reflects widening of the vessel, while tension reflects the reduction of force generated by the vascular tissue. Using either measurement allows investigators to match the readout to the isolated vessel or tissue preparation and compare relaxation with an established baseline.
Baseline and control values provide the reference needed to interpret relaxation caused by the tested stimulus. Without that comparison, a measured change cannot be separated clearly from the vessel’s starting state or from effects unrelated to the test compound. Relative analysis therefore helps determine whether the observed response reflects genuine vasoactive activity under the experimental conditions.
The magnitude of relaxation helps characterize how effectively a candidate treatment produces vasodilation, providing evidence about its potency. The same experimental framework can also reveal whether the treatment produces an undesirable vascular response or fails to behave predictably compared with controls. Together, these observations support early assessment of both therapeutic activity and safety during preclinical drug screening.
A typical workflow begins with an isolated blood vessel or vascular tissue, followed by exposure to a selected test compound or physiological signal. Investigators then quantify relaxation by recording vessel diameter or contractile tension and compare the result with baseline and control measurements. This sequence produces a functional response that can be used to evaluate vascular activity under defined experimental conditions.
Researchers use the assay to evaluate endothelial performance, study vasoactive drugs, and investigate mechanisms associated with hypertension and other vascular disorders. It is also valuable during preclinical screening, when candidate treatments must be compared for their ability to promote vascular relaxation and for possible safety concerns. The resulting measurements connect tissue-level responses with broader questions of cardiovascular function.