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| Title: | FUNCTIONING OF THE SIEMENS SERVO 900C VENTILATOR UNDER HYPERBARIC CONDITIONS - ASSESSMENT OF PRESSURE SUPPORT MODE |
| Authors: | Ingram, M
Risdall, JE |
| Keywords: | decompression
equipment
HBO
hyperbaric
chamber
Chamber Equipment
ventilator |
| Issue Date: | 2002 |
| Abstract: | INTRODUCTION: This report details assessment of a previously modified Siemen's Servo 900C ventilator in Pressure Support mode, for use in a hyperbaric environment. BACKGROUND: Critically ill patients receiving hyperbaric oxygen therapy (HBOT) may require ventilatory support. The Servo 900C is a proven, reliable ventilator for use at increased ambient pressure. Previous work has recommended Pressure Control as the ventilatory strategy of choice in the hyperbaric environment. Pressure Control ventilation frequently requires the patient to be sedated and paralyzed which is not conducive to weaning. Conversely Pressure Support ventilation is often used to facilitate weaning. Using Pressure Support in a hyperbaric environment may allow patients to receive HBOT whilst continuing to be weaned from ventilatory support. MATERIALS AND METHODS: The Siemen's Servo 900C was assessed in Pressure Support mode throughout a typical treatment profile (Royal Navy Treatment Table 66). A device for generating negative pressure, simulating patient effort (T-tube connector and hand suction unit), triggered the ventilator which was connected to a compression-spring compliant test lung. Readings of expired tidal volume were taken from both the ventilator and a Wright's respirometer sited in the expiratory limb of the breathing circuit. Peak pressures were recorded from both ventilator and test lung. RESULTS: With increasing ambient pressure a small fall in delivered tidal volume was seen in parallel with that seen in Pressure Control ventilation. On decompression an increase in the 'work of breathing', as indicated by an increase in the amount of suction required to trigger the ventilator was seen; this was overcome by decreasing the trigger sensitivity level below PEEP during ascent by 0.5 - 1.0cm H2O. CONCLUSION: Pressure Support is a potentially useful mode of ventilation in the hyperbaric environment, however clinicians should be aware of the probability of changes in respiratory effort required by the patient and adjust settings accordingly. 2. Chamber Equipment3. Authorizations a) Y b) Y 4. Financial Disclosure: a) Y, N b) N |
| Description: | Undersea and Hyperbaric Medical Society, Inc. (http://www.uhms.org ) |
| URI: | http://archive.rubicon-foundation.org/1096 |
| Appears in Collections: | UHMS Meeting Abstracts
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