Objective To study the effects of positive ent -expiratory pressure (PEEP) in airway pressure with a lung model .

目的探讨外源性呼气末正压（PEEP）对气过压力影响的规律。

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NPPV was delivered to the patient by a face mask connected to a ventilator set in pressure support ventilation (PSV) and positive end-expiratory pressure (PEEP).

在进行标准治疗同时加用NPPV。 面罩连接呼吸机，通气模式采用压力支持通气（PSV）加呼气末正压（PEEP）。

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Objective: Utilizing the noninvasive heart function monitor to choose the best positive end expiratory pressure (PEEP) for the respiratory failure patients with unstable haemodynamics.

目的：研究利用无创心功能监测仪辅助对血流动力学不稳定呼吸衰竭病人选择最佳呼气末正压（PEEP）。

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