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Chronic obstructive pulmonary disease and sleep.

Peter C Gay1

  • 1Department of Pulmonary, Critical Care and Sleep Medicine, Mayo Clinic and Foundation, 200 First Street SW, Rochester MN 55905-0001, USA. pgay@mayo.edu

Respiratory Care
|January 22, 2004
PubMed
Summary

Breathing control in chronic obstructive pulmonary disease (COPD) worsens during sleep, leading to hypoventilation, hypercapnia, and hypoxemia. This significantly impacts sleep quality and increases mortality risk in severe COPD patients.

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Area of Science:

  • Pulmonary Medicine
  • Sleep Medicine
  • Respiratory Physiology

Background:

  • Breathing control in COPD patients shares basic principles with healthy subjects but exhibits reduced feedback during sleep.
  • Severe COPD exacerbates nocturnal gas exchange and sleep quality issues due to multiple contributing factors.
  • Hypoventilation is a primary concern, causing hypercapnia and hypoxemia, particularly during REM sleep due to respiratory muscle atonia.

Purpose of the Study:

  • To elucidate the mechanisms and consequences of altered breathing control during sleep in COPD patients.
  • To highlight the diagnostic utility of polysomnography over pulse oximetry for identifying co-existing sleep disorders.
  • To discuss current therapeutic guidelines and remaining challenges in managing sleep-related breathing disorders in COPD.

Main Methods:

  • Review of physiological mechanisms affecting breathing control in COPD during wakefulness and sleep.
  • Analysis of gas exchange alterations, including hypercapnia and hypoxemia, especially during REM sleep.
  • Consideration of diagnostic tools like polysomnography for complex sleep-related breathing disorders.

Main Results:

  • Sleep-related hypoventilation in COPD leads to significant nocturnal gas exchange impairment.
  • Hypoxia during sleep increases arousals, disrupts sleep, and contributes to pulmonary hypertension and mortality.
  • Key mechanisms include decreased ventilatory response to hypercapnia, reduced respiratory muscle output, and increased upper airway resistance.

Conclusions:

  • Polysomnography is recommended for COPD patients with significant daytime hypercapnia to exclude overlap syndromes like obstructive sleep apnea.
  • Current guidelines offer direction for oxygen, CPAP, and NIPPV use, but clinical application faces practical and reimbursement hurdles.
  • Optimizing therapy requires clinicians to navigate implementation challenges and adhere to evolving treatment and coverage criteria.

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