[A study of mechanical ventilation pattern in different recovery stages of muscle relaxant after general anesthesia]

OBJECTIVE: To observe the effects of intermittent positive pressure ventilation (IPPV), synchronized intermittent mandatory ventilation (SIMV), and biphasic intermittent positive airway pressure (BiPAP) on the recovery time of automatic breathing in patients in different stages of recovery of general anesthesia with muscle relaxant. METHODS: Thirty patients were randomly divided into three groups. The initial ventilation pattern was IPPV for all patients. After the last dose of muscle relaxant, the pattern of ventilation of group II and group III was adjusted to SIMV and BiPAP, respectively. The airway peak pressure(Ppeak), minute ventilation(MV), expiration carbon dioxide(P(Et)CO(2)), blood gases, and the interval between the last dose of muscle relaxant and automatic breathing(LR-S) was observed. RESULTS: (1) When T(1) appeared, Ppeak of the BiPAP group was lower than that of the IPPV group and SIMV (all P0.05). When T(4) appeared, T(R)=0.25, T(R)=0.75, MV of SIMV group and BiPAP group was higher than that of IPPV group (all P

Duke Scholars

Author John Chichang Li Surgery