Passive Warming Products

“Depending on which reference you read, hypothermia is variously defined as a core temperature of less than 35-36ºC. Non-shivering thermogenesis begins at 36ºC, and shivering at 35-35.5ºC. Shivering generates heat, but increases glucose and energy consumption. Substrates for this heat generation rely heavily on metabolism of glucose at 2-5x the basal metabolic rate. Shivering also increases oxygen consumption, further worsening the condition of patients who are already hypoxemic at the cellular level which may further worsen shock.”

(The wool blanket) “was also the poorest performer, with a temperature drop similar to that of the control group. Mean core temperature was 35.9 C at 30 minutes, 35.26 C at 60 minutes, and 34.44 C at 120 minutes.”

Holcomb: Preventing Hypothermia: Comparison of Current Devices Used by the U.S. Army with an In Vitro Warmed Fluid Model