Cerebral vasodilation

Cerebral vasodilation is a complex physiological process characterized by the widening of blood vessels within the brain to increase cerebral blood flow (CBF). It is a key component of cerebral autoregulation, which ensures that the brain receives a steady supply of oxygen and glucose despite fluctuations in systemic blood pressure (StatPearls, 'Physiology, Cerebral Blood Flow'). This process is mediated by various factors, including metabolic demands (hypercapnia and hypoxia), myogenic responses, and neurogenic signals involving neurotransmitters like nitric oxide and peptides like CGRP (PubMed, 'Mechanisms of Cerebral Vasodilation'). In clinical practice, cerebral vasodilation is not a single molecular target but rather a therapeutic objective or a side effect of various drugs. For instance, calcium channel blockers like nimodipine are used to prevent vasospasm following subarachnoid hemorrhage, while triptans aim to reverse excessive vasodilation to treat migraine (NIH, 'Nimodipine and the Brain'). Conversely, unintended cerebral vasodilation can lead to increased intracranial pressure, which is a significant safety concern in patients with head injuries or brain tumors. Understanding the pathways governing this process is essential for managing neurovascular diseases and maintaining neurological homeostasis.

Other names

Cerebrovascular dilationBrain vasodilationDilation of cerebral arteriesCerebral blood flow augmentation

Modulation of cerebral blood vessel diameter through pathways including Nitric Oxide (NO) signaling, Calcium channel blockade, Calcitonin Gene-Related Peptide (CGRP) receptor activation, and Potassium channel opening.