131 PEAK INSPIRATORY PRESSURE (PIP) OVERSHOOTS ON SOME INFANT VENTILATORS DURING ACTIVE EXPIRATION

We examined the performance of 4 infant ventilators (Bourns BP 200, Healthdyne 105, Sechrist IV-100B, Infrasonic Infant Star) during a simulated expiration. A test lung was connected via a conventional circuit to the ventilator which was set to deliver a PIP of 20 cm H2O. A Statham pressure transducer was placed proximal to the test lung. During the inspiratory phase of the ventilator, an expiratory flow was introduced. This varied from +4 to …