Vascular reactivity

Vascular reactivity represents the physiological capacity of blood vessels to constrict or dilate in response to various stimuli, such as shear stress, hormonal signals, or pharmacological agents (PubMed: 22197669). It is a critical component of cardiovascular homeostasis, allowing the body to regulate blood pressure and distribute blood flow according to metabolic demand (StatPearls: NBK532954). This reactivity is primarily mediated by the complex interplay between the vascular endothelium, which synthesizes vasodilators like nitric oxide, and the underlying smooth muscle cells (Circulation Research: 01.RES.87.10.840). Dysfunctional vascular reactivity is a hallmark of endothelial dysfunction and is a major pathological feature of conditions like hypertension, atherosclerosis, and heart failure (PubMed: 11060918). While it is a measurable clinical phenotype or physiological parameter rather than a single molecular target, it serves as the functional outcome for numerous therapeutic interventions. Drugs such as calcium channel blockers, ACE inhibitors, and nitric oxide donors are frequently used to modulate this response in clinical settings. In research, vascular reactivity is often assessed using flow-mediated dilation or isolated vessel assays to evaluate the overall health of the vasculature.

Other names

Vasomotor reactivityVascular responsivenessVasomotor functionVascular tone regulation

Vascular reactivity is not a drug target itself but a physiological response modulated by drugs that act on the renin-angiotensin-aldosterone system, calcium channels, and the nitric oxide-cGMP pathway to alter smooth muscle contraction or endothelial factor release (StatPearls: NBK532954).