• Lori A Fritz, John K Kay, and Normalynn Garrett.
• U.S. Army Graduate Program in Anesthesia Nursing, Phase II Site, William Beaumont Army Medical Center, 5005 North Piedras Street, Stop 58, El Paso, TX 79920, USA.
• Mil Med. 2003 Apr 1;168(4):304-11.

AbstractThe Ohmeda Universal Portable Anesthesia Complete system is used in austere conditions where oxygen resources are limited and must be conserved. The purpose of this study was to describe the concentration of oxygen delivered with different combinations of seven oxygen reservoir volumes and four oxygen flow rates. The Medical Education Technologies Incorporated Human Patient Simulator reproduced human physiological tidal volumes of four simulated patients of different weights based upon a typical soldier's weight. Using least squares multiple nonlinear regression, a formula for the curves of the oxygen concentrations was developed. The analysis, across the different patient weights, showed no appreciable increase in oxygen concentration beyond a reservoir volume of 260 mL. Our findings suggest the current standard universal portable anesthesia complete reservoir may not provide optimal oxygen delivery, therefore, we recommend the current reservoir volume be increased from 130 to 260 mL.

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