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Anesth Analg 2005;100:1713-1717
© 2005 International Anesthesia Research Society
doi: 10.1213/01.ANE.0000149897.87025.A8

TECHNOLOGY, COMPUTING, AND SIMULATION

Oxygen Consumption with Mechanical Ventilation in a Field Anesthesia Machine

Dale F. Szpisjak, MD*,, Charles L. Lamb, MD{dagger}, and Kenneth D. Klions, MD{dagger}

*Department of Anesthesiology, Uniformed Services University of the Health Sciences, Bethesda, Maryland, and the {dagger}Anesthesia Department, Fleet Hospital, Bremerton, Washington

Address correspondence and reprint requests to Dale F. Szpisjak, MD, Department of Anesthesiology, Uniformed Services University of the Health Sciences, 4301 Jones Bridge Road, Bethesda, MD 20814. Address e-mail to dszpisjak{at}usuhs.mil.

Field anesthesia machines (FAM) with gas-powered ventilators have been developed for remote locations that may not have a central supply of oxygen. These ventilators may rapidly deplete oxygen cylinders, especially in patients with decreased pulmonary compliance. Our goal in this study was to determine oxygen consumption rates with a contemporary FAM in models of high (HC) and low (LC) pulmonary compliance. Oxygen consumption rates were tested using D cylinders (initial pressure 1700 psig) and the Narkomed® M FAM, which uses an air injector to decrease compressed gas consumption by entraining room air as part of the drive gas. Three different tidal volumes (Vt) were tested (500, 750, and 1000 mL) with HC and LC lung models, and the fresh gas flow rate was 1 L/min. Respiratory rate was constant at 10 breaths/min. Oxygen consumption varied directly with Vt and inversely with compliance, increasing from 4.8 ± 0.07 L/min with the HC-500 mL Vt model to 6.2 ± 0.05 L/min with the LC-1000 mL Vt model. D cylinder duration ranged from 56.8 ± 0.4 to 73.6 ± 1.0 minutes. Assuming oxygen fresh gas flow of 1 L/min, calculating tank duration with the fastest consumption rate underestimated the tank duration for more compliant and smaller Vt models but provided a greater margin of patient safety.




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D. F. Szpisjak, E. N. Javernick, R. R. Kyle, and P. N. Austin
Oxygen Consumption of a Pneumatically Controlled Ventilator in a Field Anesthesia Machine
Anesth. Analg., December 1, 2008; 107(6): 1907 - 1911.
[Abstract] [Full Text] [PDF]


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 © 2005 by the International Anesthesia Research Society.