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Sleep-disordered breathing in amyotrophic lateral sclerosis

K A Ferguson1, M J Strong, D Ahmad

  • 1Department of Medicine, University of Western Ontario, London, Canada.

Chest
|September 1, 1996
PubMed
Summary

Patients with amyotrophic lateral sclerosis (ALS) experience sleep-disordered breathing, similar to those with respiratory muscle weakness. This study found no obstructive sleep apnea in ALS patients, suggesting unique respiratory challenges.

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Area of Science:

  • Neurology
  • Sleep Medicine
  • Respiratory Medicine

Background:

  • Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease affecting motor neurons.
  • Bulbar muscle involvement in ALS can lead to respiratory compromise and sleep disturbances.

Purpose of the Study:

  • To evaluate sleep patterns and breathing abnormalities in ALS patients with bulbar muscle involvement.
  • To compare sleep and respiratory parameters between ALS patients and healthy controls.

Main Methods:

  • A prospective, controlled polysomnography study was conducted.
  • Eighteen ALS patients and 10 age-matched controls underwent sleep monitoring.
  • ALS patients with bulbar involvement were assessed for sleep-disordered breathing.

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Main Results:

  • ALS patients exhibited increased arousals, more stage 1 sleep, and reduced total sleep time compared to controls.
  • Mild sleep-disordered breathing, characterized by a higher apnea/hypopnea index, was observed in ALS patients.
  • Second-night polysomnography showed improvements in total sleep time and REM sleep, with less stage 1 sleep.

Conclusions:

  • Sleep-disordered breathing is prevalent in ALS patients with bulbar involvement, resembling patterns seen in other conditions with respiratory muscle weakness.
  • Obstructive sleep apnea was not observed, potentially due to impaired inspiratory pressure generation in patients with respiratory muscle weakness.