CPAP on Oxygenation and Pulmonary Function in Elderly Patients After Major Open Abdominal Surgery

Auto Continuous Positive Airway Pressure via nasal mask using the JPAP system (Metran, Saitama, Japan) which can provide CPAP with a range of 2-10 cmH2O, the initial CPAP 2 cmH2O, then reach 7.5 cmH2O after a ramping time. CPAP values may vary with each breath until the obstruction is resolved

Patients connected to the O2-Max Trio CPAP system (Pulmodyne, Indianapolis, USA) with a facial mask that was adjusted to maintain a CPAP at 7.5 cm H2O and FiO2 30% continuously for the following 1 hour