[abstract] FUNCTION OF DIFFERENT ICU VENTILATORS UNDER HYPERBARIC CONDITIONS.

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[abstract] FUNCTION OF DIFFERENT ICU VENTILATORS UNDER HYPERBARIC CONDITIONS.

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Title: [abstract] FUNCTION OF DIFFERENT ICU VENTILATORS UNDER HYPERBARIC CONDITIONS.
Author: Stahl, W; Calzia, E; Radermacher, P
Abstract: BACKGROUND: This study was to investigate the function of 4 different ICU-ventilators EVITA-4, Microvent, Oxylog 2000 HBO (Dragerwerk AG, Germany) and Servo ventilator 900 C (Siemens-Elema, Sweden)) under 5 (normobaric, 1.3, 1.6, 1.9 and 2.8 ATA, EVITA-4 and Oxylog 2000 HBO) or 6 (additionally 6 ATA, Servo ventilator 900 C and Microvent) different atmostpheric pressure conditions, regarding the difference of present and effectively applied volume and pressure from those set at the control panel. METHODS: We test the ventilator modes: volume (VCV) and pressure controlled ventilation (PCV, EVITA-4 and Servo ventilator 900 C only), the electromechanical lung simulator LS 1500 (Dragerwerk AG, Germany). During VCV tidal volume was set at (VT) = 750 ml, respiratory rate (f) = 15/min, I:E ration = 1:2, positive endexpiratory pressure (PEEP) = 0cm H2O. During PCV (f) = 10/min inspiratory pressure Pinsp) was set in order to achieve a Vt was 750ml keeping all others ventilator parameters constant. The VT applied by the ventilator was measured as the linear displacement of the bellos at each ambient pressure. Airway pressure was measured inside the bellows. RESULTS: During VCV applied Vt of the ventilator decreases significantly with increasing ambient pressure. In contrast Vt was stable at each depth during PCV with constant Pinsp and PEEP. See pg. 15 to view graphs. CONCLUSIONS: Under hyperbaric conditions PCV should be preferred due to the stability of VT applied. If PCV is not available, VT needs to be adjusted during VCV depending on the actual ambient pressure. ACKNOWLEDGEMENT: We thank Dragerwerk AG, Germany for kinly providing us the lung simulator LS 1500.
Description: Undersea and Hyperbaric Medical Society, Inc. (http://www.uhms.org )
URI: http://archive.rubicon-foundation.org/605
Date: 1998

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  • UHMS Meeting Abstracts
    This is a collection of the published abstracts from the Undersea and Hyperbaric Medical Society (UHMS) annual meetings.

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