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Anesth Analg 1977; 56:822-825
© 1977 International Anesthesia Research Society
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Rebreathing Characteristics of the Bain Anesthesia Circuit

SIVAM RAMANATHAN, MD*, JACK CHALON, MD{dagger}, LEVON CAPAN, MD*, CHANDRAKANT PATEL, MD{ddagger}, and HERMAN TURNDORF, MD§

*Assistant Professor of Anesthesiology. {dagger}Associate Professor of Anesthesiology. {ddagger}Instructor in Anesthesiology. §Professor and Chairman, Department of Anesthesiology. Department of Anesthesiology, New York University Medical Center, New York, New York 10016.

Abstract

The humidity output and CO3 elimination of the Bain circuit were tested on a simulated adult patient. The moisture content of inspired gases was found to be adequate when the circuit was used with a minute volume of 8.4 L/min and a fresh gas inflow of 4.9 L/min (65 percent relative humidity at room temperature at the onset of experimentation, rising to 100 percent after 80 minutes). However, the mean inspired CO2 concentration increased from 0.8 percent to 5.5 percent when the fresh gas inflow was decreased from 8 L/min to 3.5 L/min. It is recommended, therefore, that the circuit should not be used for long periods of time without measuring arterial CO. tension or in situations where intentional hypocarbia is desired.

Key Words: EQUIPMENT, circuits, nonre-breathing • ANESTHETIC TECHNICS, nonre-breathing






Lippincott, Williams & Wilkins 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 HighWire Press
Copyright © 1977 by the International Anesthesia Research Society.