,LABORATORIES: , An arterial blood gas on room air showed a pH of 7.38, PCO2 of 52, and PO2 of 57.,CPAP compliance monitoring over the past two to three weeks showed average use of 3 hours 26 minutes on nights used. 
,LABORATORIES : , An arterial blood gas on room air showed a pH of 7.38 , PCO2 of 52 , and PO2 of 57.,CPAP compliance monitoring over the past two to three weeks showed average use of 3 hours 26 minutes on nights used .