Sympathetic dysfunction of central origin in patients with ALS.

Area of Science:

• Neurology
• Autonomic Nervous System Research
• Vascular Physiology

Background:

• Amyotrophic lateral sclerosis (ALS) is a progressive motor neuron disease.
• Evidence suggests ALS may also affect the autonomic nervous system.
• Autonomic dysfunction can impact vascular regulation.

Purpose of the Study:

• To evaluate centrally and peripherally mediated autonomic vascular reflexes in ALS patients.
• To correlate autonomic function with clinical disease severity.
• To investigate the location of sympathetic dysfunction in ALS.

Main Methods:

• Utilized the local 133-Xenon washout technique to assess sympathetic vasoconstrictor responses.
• Employed the head-up tilt table test to evaluate autonomic cardiovascular regulation.
• Examined nine ALS patients and 15 age-matched healthy controls.

Main Results:

• 133-Xenon washout revealed a significantly reduced centrally mediated sympathetic vasoconstrictor response in ALS patients.
• A preserved locally mediated vascular response was observed in ALS patients.
• Head-up tilt table testing showed a significantly higher mean arterial blood pressure in ALS patients, likely due to increased vascular resistance.
• No correlation was found between ALS Severity Scores and measured blood flow or blood pressure parameters.

Conclusions:

• The findings support a central sympathetic dysfunction in ALS.
• Autonomic abnormalities in ALS appear localized to the central nervous system.
• This central sympathetic dysfunction is present regardless of the ALS disease stage.