Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Different patterns of oxygen desaturation during sleep in patients with a) COPD, b) obstructive sleep apnoea and c) overlap syndrome. SaO2: arterial oxygen saturation; SpO2: arterial oxygen saturation measured by pulse oximetry; PtcCO2: transcutaneous carbon dioxide tension; REM: rapid eye movement.
