10. EVALUATE THE EFFECTIVENESS OF IMPROVING RESPIRATORY FUNCTION AND BLOOD OXYGENATION OF CPAP METHOD ON JPAP DEVICE IN ELDERLY PATIENTS AFTER ABDOMINAL SURGERY. YHCĐ. 2024;65(CĐ 9 - Hội Gây mê Hồi sức). doi:10.52163/yhc.v65iCD9.1517