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Medishield AGS system and servo 900 ventilators |
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| Authors: | W M GRAY R C HALL K B CARTER A SHAW W J THOMSON |
| Institution: | W.M. Gray, BSc. PhD, Senior Physicist, R.C. Hall, BSc, Basic Grade Physicist, K.B. Carter, BSc, MSc, CEng, A. Shaw, BSc, CEng, Principal Physicists, West of Scotland Health Boards, Department of Clinical Physics and Bio-Engineering, 11 West Graham Street, Glasgow G4 9LF, W.J. Thomson, MB, ChB, FFARCS. Consultant Anasthetist, Falkirk and District Royal Infirmary, Major's Loan, Falkirk, Stirlingshire FKI 5QE. |
| Abstract: | The use of the new Medishield anaesthetic gas scavenging system with ventilators in the Siemens-Elema Servo 900 series was investigated. It was discovered that this combination of equipment creates the hazard that a disconnexion in the patient breathing system may not be detected by the ventilator alarm. This happens because the suction generated by the scavenging system draws a considerable flow of room air through the expiratory system of the ventilator when a disconnexion occurs. Possible solutions to the problem were investigated, and it was discovered that the problem can be overcome by applying a small amount of positive end-expiratory pressure to counteract the suction from the scavenging system. |
| Keywords: | Equipment exhaust systems ventilators Anasthetics gases trace concentrations |
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