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Nocturnal hypoxaemia in chronic obstructive pulmonary disease
Clinical Science (London, England : 1979)
|February 1, 1983
Summary
Patients with chronic obstructive pulmonary disease (COPD) experience greater nocturnal oxygen dips with lower daytime arterial oxygen saturation (Sao2). Reduced ventilation during sleep appears to be the primary cause of these hypoxemic events.
Area of Science:
- Pulmonary Medicine
- Sleep Medicine
- Respiratory Physiology
Background:
- Chronic obstructive pulmonary disease (COPD) is often associated with impaired gas exchange.
- Nocturnal hypoxemia is a common complication in COPD patients, but its underlying mechanisms require further elucidation.
Purpose of the Study:
- To investigate the relationship between daytime arterial oxygen saturation (Sao2) and nocturnal oxygen desaturation in COPD patients.
- To explore the potential causes of nocturnal hypoxemic dips, including changes in ventilation.
Main Methods:
- Arterial oxygen saturation (Sao2) was monitored day and night in 41 COPD patients.
- Ventilation was measured using respiratory inductance plethysmography in a subset of hypoxemic patients.
Main Results:
- Greater nocturnal Sao2 falls were observed in patients with lower daytime Sao2.
- Nocturnal hypoxemic dips correlated with diminished ventilation, not always detected by nasal thermistors.
- Erythrocyte mass showed a strong correlation with daytime Sao2, unaffected by nocturnal hypoxemia.
Conclusions:
- Lower daytime Sao2 in COPD patients predicts more significant nocturnal oxygen desaturation.
- Reduced ventilation during sleep is a likely contributor to nocturnal hypoxemic events in COPD.
- Nasal thermistors may not reliably detect ventilation changes associated with hypoxemia.