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Updated: Jul 25, 2026
09:54
A Model to Simulate Clinically Relevant Hypoxia in Humans
Published on: December 22, 2016
Transient hypoxaemia during sleep in chronic bronchitis and emphysema
Lancet (London, England)
|January 6, 1979
Summary
Patients with chronic bronchitis and emphysema experience transient hypoxemia during sleep. These episodes, particularly during REM sleep, may contribute to pulmonary hypertension and polycythemia in "blue and bloated" individuals.
Area of Science:
- Pulmonary Medicine
- Sleep Medicine
- Respiratory Physiology
Background:
- Chronic bronchitis and emphysema are major causes of respiratory disease.
- Patients with these conditions often exhibit distinct clinical phenotypes, such as "blue and bloated" or "pink and puffing".
Purpose of the Study:
- To investigate arterial oxygenation and breathing patterns during sleep in patients with chronic bronchitis and emphysema.
- To compare sleep-related respiratory parameters between "blue and bloated" patients, "pink and puffing" patients, and healthy subjects.
Main Methods:
- Polysomnography was used to monitor electroencephalogram, breathing patterns, and arterial oxygen saturation during sleep.
- Continuous monitoring of arterial oxygen saturation was performed in patients with chronic bronchitis and emphysema and healthy controls.
Main Results:
- All 10 "blue and bloated" patients experienced episodes of transient hypoxemia (oxygen saturation drop >10%) during sleep, lasting 1-100 minutes.
- No such desaturation events were observed in the 2 "pink and puffing" patients or the 4 healthy subjects.
- Hypoxemic episodes predominantly occurred during the rapid-eye-movement (REM) stage of sleep.
Conclusions:
- Transient hypoxemia during sleep is a significant finding in "blue and bloated" patients with chronic bronchitis and emphysema.
- These hypoxemic episodes are likely caused by a combination of hypoventilation and ventilation/perfusion (V/Q) mismatch.
- Sleep-related hypoxemia may be a contributing factor to the development of pulmonary hypertension and secondary polycythemia characteristic of the "blue and bloated" phenotype.
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