Autonomic Function Tests, Heart Rate Variability, and Electrophysiological Evaluation in Patients With a Primary...

Area of Science:

• Neurology
• Autonomic Neuroscience
• Electrophysiology

Background:

• Cranial autonomic symptoms are characteristic of trigeminal autonomic cephalalgias and migraine.
• Autonomic nervous system (ANS) dysfunction is implicated in the pathophysiology of various headache disorders.
• Previous research suggests ANS dysfunctions may precipitate or exacerbate headache attacks.

Purpose of the Study:

• To evaluate parasympathetic and sympathetic autonomic functions in patients with episodic primary headaches.
• To investigate electrophysiological abnormalities using blink reflex and sympathetic skin response tests in these patients.
• To explore the association between autonomic function and specific headache types, namely migraine and tension-type headache.

Main Methods:

• A cross-sectional study involving 100 patients (50 migraine, 50 tension-type headache) diagnosed via established criteria.
• Autonomic function tests included blood pressure response to sustained handgrip (sympathetic) and heart rate response to Valsalva maneuver (parasympathetic).
• Electrophysiological assessments comprised blink reflex and sympathetic skin response tests; Ewing battery was used for autonomic functional disability assessment.

Main Results:

• Significant alterations in sympathetic (handgrip) and parasympathetic (Valsalva) activities were found in migraine patients (P < 0.05).
• Migraine patients exhibited prolonged sympathetic skin response latency compared to controls.
• Tension-type headache patients showed significant differences in blood pressure response to handgrip and heart rate variability (P < 0.05).
• Blink reflex tests were normal in all headache patients; migraineurs showed significant autonomic disability.

Conclusions:

• Autonomic functional abnormalities, involving both sympathetic and parasympathetic systems, are evident in patients with primary episodic headaches.
• These findings suggest a role for dysautonomia in the pathogenesis of migraine and tension-type headache.
• Further research into autonomic dysfunction may offer novel therapeutic targets for headache management.