Optimal PEEP with lowest (least injurious) transpulmonary driving pressure can be determined by a rapid two-PEEP-step procedure without esophageal pressure.
Optimal PEEP with lowest (least injurious) transpulmonary driving pressure can be determined by a rapid two-PEEP-step procedure without esophageal pressure.
Project description:Interventions: experimential group:Optimal positive end expiratory pressure guided by driving pressure;control group:Positive end expiratory pressure in 5cmH2O
Primary outcome(s): Incidence of PPCs within 7 days after operation
Study Design: Parallel