Polysomnography in stable COPD under non-invasive ventilation to reduce patient-ventilator asynchrony and morning breathlessness.

This may have precluded the demonstration of significant improvements in objective sleep quality which is suggested by nearly significant increases in sleep efficiency (69 ± 18% vs. 76 ± 13%, n.s.) and slow wave and REM sleep (% N3 + REM 29 ± 12% vs. 38 ± 14%, n.s.).

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