PMID: 18717110Aug 23, 2008Paper

Hypercapnia effect on core cooling and shivering threshold during snow burial

Aviation, Space, and Environmental Medicine
Colin K GrissomJ Scott Morgan

Abstract

Hypercapnia during avalanche burial may increase core temperature cooling rate by decreasing the temperature threshold for shivering or by increasing respiratory heat loss. We studied the effect of hypercapnia on rectal core temperature (T(re)) cooling rate, respiratory heat loss, heat production, and the T(re) shivering threshold during snow burial (mean snow temperature -3.2 + 2.7 degrees C) in 11 subjects. In a 60-min hypercapnic burial subjects breathed a 5% carbon dioxide and 21% oxygen inhaled gas mixture and in a separate 60-min normocapnic burial subjects breathed ambient air. After extrication from snow burial subjects were passively rewarmed in a 15 degrees C shelter and T(re) afterdrop was measured. The deltaT(re) over 1 h of burial in the hypercapnic study was 1.28 +/- 0.4 degrees C and in the normocapnic study was 0.97 +/- 0.4 degrees C (P = 0.045). Minute ventilation, respiratory heat loss, total metabolic rate, and metabolic rate of the respiratory muscles were greater during the hypercapnic burial. There was no difference in shivering threshold between the hypercapnic and normocapnic conditions. Afterdrop in the hypercapnic study (0.69 +/- 0.4 degrees C at 21 +/- 8.1 min after extrication) was not different than...Continue Reading

Citations

Oct 4, 2011·High Altitude Medicine & Biology·Hermann BruggerJeff Boyd
Sep 14, 2010·Wilderness & Environmental Medicine·Colin K GrissomAndre Crouch
Apr 8, 2010·Resuscitation·Jeff BoydMichael Shuster
Jun 19, 2009·Resuscitation·Martin I RadwinGordon Giesbrecht
Mar 18, 2016·Tidsskrift for den Norske lægeforening : tidsskrift for praktisk medicin, ny række·Sven Christjar Skaiaa, Øyvind Thomassen
Oct 5, 2014·Wilderness & Environmental Medicine·Scott E McIntoshColin K Grissom
Jun 21, 2015·Journal of the Royal Army Medical Corps·Daniel K Kornhall, Julie Martens-Nielsen
Mar 5, 2017·Wilderness & Environmental Medicine·Christopher Van TilburgHermann Brugger
Sep 12, 2018·Scandinavian Journal of Medicine & Science in Sports·Emily ProcterMartin Burtscher
Sep 2, 2020·International Journal of Biometeorology·Paweł PodsiadłoHermann Brugger
Sep 13, 2014·World Journal of Emergency Medicine·Douglas G Sward, Brad L Bennett
Mar 25, 2021·High Altitude Medicine & Biology·Christof MittermairPeter Paal

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