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* From the Departments of Anesthesia, McMaster University, Hamilton, Southmedic Inc.,
Barrie, Dinesen Research Group,
Toronto, and the Royal Victoria Hospital,
Barrie, Ontario, Canada.
Dr. Elizabeth Ling, Assistant Clinical Professor, McMaster University, Department of Anesthesia, Hamilton Health Sciences, Hamilton General Site, 237 Barton Street East, Hamilton, Ontario L8L 2X2, Canada. Phone: 905-527-0271, ext. 46698; Fax: 905-577-8023; E-mail: linge{at}mcmaster.ca
Purpose: To describe the development and performance of a new minimal contact oxygen (O2) delivery system for both nasal and oral breathing, with capnographic capabilities.
Methods: The development and design challenges of the OxyArmTM (OA) prototype are described. The innovative design utilizes a headset with a semi-rigid boom and an O2 diffuser. The OA was compared to the Venturi mask in eight healthy adults after informed consent. Inspired O2 fractions were measured in the hypopharynx using continuous gas sampling at low to high O2 flow rates. Mean data were compared using two-tailed paired t tests with significance set at 0.05.
Results: The measured inspired O2 concentration was higher in the OA at 2 (26.3 ± 2.5 vs 23.3 ± 0.5, P <0.01) and 6 L•min–1 (33.5 ± 3.3 vs 28.8 ± 1.2, P <0.01) flow rates. At 12 L•min–1, the O2 concentration was less in the OA (39.2 ± 6.3 vs 46.0 ± 2.7, P <0.02). All subjects found both systems comfortable for the short duration of the study.
Conclusions: The OA delivered predictable concentrations of O2 over low to medium flow rates. This system is comfortable, easy to use, non-obtrusive, odorless, and latex-free. The ability to monitor capnography makes this device ideal for monitored anesthesia care or in other settings (intensive care) where monitoring of respiration is warranted. This device does not contact the face and thus may be ideal for pediatric patients and those on long-term home O2 therapy. Further clinical trials in these areas are warranted.
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