Mean peak inspiratory pressure was significantly lower during APRV ( 25 . 4 ± 1 . 26 vs . 29 . 8 ± 0 . 60 , p < 0 . 001 ) compared to CMV prior to APRV but mean airway pressure ( P aw ) was significantly higher during APRV ( 19 . 1 ± 0 . 9 vs . 15 . 3 ± 1 . 3 , p < 0