Abnormal cardiovascular response to nitroglycerin in migraine

Area of Science:

• Cardiovascular Physiology
• Neurology
• Autonomic Function

Background:

• Migraine and vasovagal syncope share potential pathophysiological links via autonomic control.
• Nitroglycerin can trigger both conditions, suggesting heightened sensitivity in migraineurs.

Purpose of the Study:

• To investigate the cardiovascular responses to nitroglycerin in individuals with migraine.
• To explore potential differences in autonomic compensatory mechanisms between migraineurs and controls.

Main Methods:

• Intravenous nitroglycerin administration in 16 women with migraine and 10 controls.
• Continuous monitoring of cardiovascular parameters including blood pressure, heart rate, cardiac output, stroke volume, and total peripheral resistance using finger photoplethysmography.

Main Results:

• Nitroglycerin provoked migraine-like attacks in 81.2% of migraineurs, but not in controls.
• Migraineurs showed significantly different cardiovascular responses compared to controls, including more pronounced and prolonged decreases in cardiac output and stroke volume, increased heart rate, and altered blood pressure and peripheral resistance patterns.

Conclusions:

• Migraineurs exhibit exaggerated systemic cardiovascular responses to nitroglycerin, supporting the hypothesis of increased systemic sensitivity to vasodilators.
• These findings suggest possible insufficient autonomic compensatory mechanisms in migraine, contributing to the observed hypersensitivity.