This issue of Sleep and Breathing presents a section on sleep in COPD, a widespread disease consuming many health resources which is often diagnosed so late that little chance of reversibility remains. The early detection of the warning clinical signs can include sleep studies, mainly in the presence of arterial carbon dioxide levels higher than expected from pulmonary function tests. Two of the articles deal with hypercapnia and nocturnal hypoventilation in COPD; the third underlines the impact of tobacco smoking on snoring and on oxygen availability to tissues, showing a poor reliability of pulse oximetry in subjects with heavy smoking habits.
- Sleep apnea
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