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Is Your Vaporizer Off?

THOMAS L. COOK, MD^*, EDMOND I. EGER, II, MD, and ROBERT S. BEHL, MS

*Research Trainee. Professor. Product Marketing Manager, Anesthesia Equipment, Ohio Medical Products, Madison, Wisconsin. From the Department of Anesthesia, University of California, San Francisco, California 94143.

Abstract

We found that both variable bypass (Tec-type) and measured flow (Kettle type) vaporizers that nominally are turned off may permit anesthetic to leak into the bypass or the diluent stream. The contamination ranges from 1 to 3,300 parts per million of halothane (0.0001 to 0.33 percent). It appears to result either from diffusion of agent from the liquid reservoir into the bypass or diluent stream or from a reservoir in the piping connecting vaporizer to the diluent stream.

Key Words: EQUIPMENT, vaporizers • ANESTHETICS, gases, trace concentrations

Anesthesia & Analgesia® is published for the International Anesthesia Research Society® by Lippincott Williams & Wilkins with the assistance of Stanford University Libraries' HighWire Press®. Copyright 2006 by the International Anesthesia Research Society. Online ISSN: 1526-7598   Print ISSN: 0003-2999