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) overlap syndrome and (C) OSA. COPD, chronic obstructive pulmonary disease; OSA, obstructive sleep apnoea; SaO2/SpO2, oxygen saturation; PtcCO2, transcutaneous carbon dioxide tension [adapted from (38)].
