|
|
Rubicon Research Repository >
Rubicon Foundation Archive >
UHMS Meeting Abstracts >
Please use this identifier to cite or link to this item:
http://archive.rubicon-foundation.org/1475
|
| Title: | ASSESSMENT OF THE SERVO 900C VENTILATOR FOR USE WITH MIXED GAS (HELIOX) ON ROYAL NAVY TREATMENT TABLE 67 |
| Authors: | Risdall, JE
Hasan, SK |
| Keywords: | helium
heliox
decompression
equipment
embolism
AGE
DCI
ventilator |
| Issue Date: | 2004 |
| Abstract: | INTRODUCTION: Current algorithms for managing gas embolism or severe decompression illness may require ventilated patients to be treated at depths greater than 18msw, if there is continued clinical deterioration at that depth. A previously modified Servo 900C ventilator (Siemanns Corp., Denmark)1, was assessed for use with mixed gas (50:50 heliox) following the profile of Royal Navy Treatment Table 67 (RNTT67). METHODS: The Servo 900C was set to ventilate a compression-spring compliant test lung (Datex-Ohmeda, UK) with 50:50 heliox during a series of dives to 24 and 30msw, representative of the pressure profiles of the heliox phase of the table. The ventilator was tested in both pressure (PC) and volume (VC) control modes, with and without PEEP. The delivered tidal volume (TV) was recorded from the ventilator and a separate Wright's respirometer, whilst peak inspiratory (Pi) pressure was recorded from the ventilator and end-expiratory (Pexp) pressures were recorded from the ventilator and test lung. 10 readings were taken on the surface, ventilating air, before and after each dive. 20 readings were taken at depth and one every two minutes during the 30 minute ascents from 30 to 24msw and 24 to18msw. RESULTS: In PC mode, the TV recorded by the respirometer and Pi remained constant throughout, but the TV recorded by the ventilator under-read by 10percent on the surface and over-read by a similar amount at depth. In VC mode, the respirometer-recorded TV and the Pi fell by up to 20percent at depth, whilst the TV recorded by the ventilator remained constant. PEEP, when present and Pexp remained constant throughout. CONCLUSION: The Servo 900C functions adequately and predictably during the heliox phases of RNTT67. PC is the preferred mode of ventilation because of the greater stability at depth2, however, provided separate spirometry is available, appropriate corrections are possible to allow the safe use of VC. 1 Ingram M, Risdall JE. UHM 2002; 29: 156, 2 Stahl W, Radermacher P, Calzia E. Intensive Care Med 2000; 26: 442-448 |
| Description: | Undersea and Hyperbaric Medical Society, Inc. (http://www.uhms.org ) |
| URI: | http://archive.rubicon-foundation.org/1475 |
| Appears in Collections: | UHMS Meeting Abstracts
|
All items in DSpace are protected by copyright, with all rights reserved.
|
