Effect of Head and Face Insulation on Cooling Rate During Snow Burial

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Presentation transcript:

Effect of Head and Face Insulation on Cooling Rate During Snow Burial Scott E. McIntosh, MD, MPH, Andre K. Crouch, MD, Andrew Dorais, MD, Marion McDevitt, DO, MPH, Courtney Wilson, MD, Chris H. Harmston, MSE, Marty I. Radwin, MD, Colin K. Grissom, MD Wilderness & Environmental Medicine Volume 26, Issue 1, Pages 21-28 (March 2015) DOI: 10.1016/j.wem.2014.07.003 Copyright © 2015 Wilderness Medical Society Terms and Conditions

Figure 1 a. AvaPack (Black Diamond Equipment, Salt Lake City, UT) mechanism of operation. Open arrows show flow of inspiratory air, and shaded arrows show flow of expiratory air. b. Experimental lines used during study. The subject breathes in and out through the mouthpiece (A). An emergency oxygen backup line (B) is attached directly into the mouthpiece apparatus and is used only if the subject becomes hypoxemic or requests to end the study. Monitoring lines (C and D) are connected to a capnometer and record inspiratory Pco2, end-tidal Pco2, and minute ventilation (V̇E). Inhaled air enters from the snowpack through the 1-way inspiratory valve on the left chest strap (E). Expired air leaves the lungs through the mouthpiece and travels down the respiratory tubing to the housing and then passes through an expiratory 1-way valve located at the bottom of the housing (E) and travels via respiratory tubing inside the pack around to the opposite side of the pack (F). Wilderness & Environmental Medicine 2015 26, 21-28DOI: (10.1016/j.wem.2014.07.003) Copyright © 2015 Wilderness Medical Society Terms and Conditions

Figure 2 Ingestible telemetric body core temperature sensor. Wilderness & Environmental Medicine 2015 26, 21-28DOI: (10.1016/j.wem.2014.07.003) Copyright © 2015 Wilderness Medical Society Terms and Conditions

Figure 3 Participant enrollment, exclusion, and analysis. Wilderness & Environmental Medicine 2015 26, 21-28DOI: (10.1016/j.wem.2014.07.003) Copyright © 2015 Wilderness Medical Society Terms and Conditions

Figure 4 Comparison of the mean temperatures of all participants between the control (blue symbols) and intervention (green symbols) periods for each method of temperature measurement: esophageal (A), rectal (B), and capsule (C). Bars indicate the magnitude of difference between mean temperatures for control vs intervention at a specific time point. Wilderness & Environmental Medicine 2015 26, 21-28DOI: (10.1016/j.wem.2014.07.003) Copyright © 2015 Wilderness Medical Society Terms and Conditions