Autonomic dysfunction in patients with episodic cluster headache during remission period

Area of Science:

• Neurology
• Autonomic Neuroscience
• Cardiovascular Physiology

Background:

• The hypothalamus plays a role in cluster headache (CH) pathophysiology and autonomic control.
• Cranial autonomic symptoms are characteristic during CH attacks, but other autonomic manifestations may occur.
• This study investigates the autonomic nervous system (ANS) in CH patients during remission.

Purpose of the Study:

• To explore autonomic nervous system function in patients with cluster headache during their remission period.
• To identify potential autonomic imbalances in CH patients outside of active attacks.

Main Methods:

• A cross-sectional study involving 30 CH patients and 30 age- and sex-matched controls.
• Analysis of time- and frequency-domain heart rate variability (HRV) parameters.
• Assessment of sympathetic nervous system activity via plasma norepinephrine (NE) levels and active orthostatic tests.

Main Results:

• CH patients exhibited significantly lower HRV parameters, including pNN50 and SDNN, compared to controls.
• Mean heart rate (HR) was significantly higher in CH patients.
• Plasma norepinephrine (NE) levels were significantly elevated in both supine and standing positions in CH patients.

Conclusions:

• A significant decrease in HRV and elevated plasma NE levels suggest an autonomic nervous system imbalance in CH patients during remission.
• These findings indicate persistent autonomic dysfunction in CH, even between symptomatic attacks.