Effect of Different Ventilation Modes on POCD in Elderly Patients with Abdominal Wall Hernia

Following induction, Group I patients received mechanical ventilation using the PC mode. The anesthetic machine (MAQUET Flow-I, Italy) parameters were set as follows: The inspiratory pressure (Pins) was adjusted to maintain an end-tidal carbon dioxide concentration (ETCO2) of 4.0-5.0 kPa. Pure oxygen and air were utilized at 0.3 L/min each, with an oxygen content of 41%. The positive end-expiratory pressure (PEEP) was set at 10 cmH2O, with an inspiration-to-expiration ratio of 1:2, a respiratory rate of 16 breaths per minute, and an oxygen content of 41%.

Following induction, Group II patients received mechanical ventilation using the VC mode. The anesthetic machine (MAQUET Flow-I, Italy) parameters were set as follows: The inspiratory pressure (Pins) was adjusted to maintain an end-tidal carbon dioxide concentration (ETCO2) of 4.0-5.0 kPa. Pure oxygen and air were utilized at 0.3 L/min each, with an oxygen content of 41%. The positive end-expiratory pressure (PEEP) was set at 10 cmH2O, with an inspiration-to-expiration ratio of 1:2, a respiratory rate of 16 breaths per minute, and an oxygen content of 41%.

Following induction, Group III patients received mechanical ventilation using the PRVC mode. The anesthetic machine (MAQUET Flow-I, Italy) parameters were set as follows: The inspiratory pressure (Pins) was adjusted to maintain an end-tidal carbon dioxide concentration (ETCO2) of 4.0-5.0 kPa. Pure oxygen and air were utilized at 0.3 L/min each, with an oxygen content of 41%. The positive end-expiratory pressure (PEEP) was set at 10 cmH2O, with an inspiration-to-expiration ratio of 1:2, a respiratory rate of 16 breaths per minute, and an oxygen content of 41%.