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Canadian Journal of Anesthesia 51:616-620 (2004)
© Canadian Anesthesiologists' Society, 2004
Cardiothoracic Anesthesia, Respiration and Airway

Contemporary anesthesia ventilators incur a significant "oxygen cost"

[Les ventilateurs d’anesthésie actuels exposent à une importante «dépense d’oxygène»]

Gudmundur K. Klemenzson, MD* and Misha Perouansky, MD{dagger}

* From the Department of Anesthesia and Critical Care, Landspitalinn University Hospital of Iceland, Reykjavik, Iceland; and
{dagger} the Department of Anesthesiology, University of Wisconsin Medical School, Clinical Science Center, Madison, Wisconsin, USA.

Address correspondence to: Dr. Misha Perouansky, Department of Anesthesiology, University of Wisconsin Medical School B6/319 Clinical Science Center, 600 Highland Avenue, Madison, WI 53792-3272, USA. Phone: 608-263-4429; Fax: 608-262-5558; E-mail: mperouansky{at}wisc.edu

Purpose: Anesthesia ventilators use oxygen or oxygen/air mixtures to drive the bellows during controlled ventilation. As a practitioner may find himself in a situation that the only available oxygen source is a compressed oxygen cylinder, it is important to know the oxygen consumption of anesthesia ventilators during controlled ventilation.

Methods: We tested the Datex-Ohmeda 7900 ventilator mounted on an Excel 210 anesthesia machine under a variety of conditions. For comparison, we also tested the Ohmeda 7800 and the Dräger AV-2 ventilator under control conditions. All experiments were performed using a test lung.

Results: The oxygen consumption of the AV-2 and the Datex-Ohmeda ventilators averaged 302 ± 17 L·hr–1 and 564 ± 68 to 599 ± 56 L·hr–1, respectively (P < 0.01 AV-2 vs 7800 and 7900). When using an E-type cylinder, this would result in a mean time to alarm of 93 min and 54 to 57 min, respectively. Decreased lung compliance increased the oxygen consumption to 848 ± 16 L·hr–1.

Conclusions: Machine-driven mechanical ventilation incurs a significant "oxygen cost." We show that the amount of oxygen consumed by mechanical ventilation with contemporary anesthesia ventilators is influenced by patient-dependent factors and may greatly exceed the amount of oxygen delivered to the patient.




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