Unformatted text preview: The innermost clothing layer should not only provide insulation but also wick
moisture away from the skin to reduce evaporative heat loss — polyester or
polypropylene thermal underwear. Clothing insulation is reduced if wind penetrates the outer garments. IV. COLD INJURIES A. Hypothermia Hypothermia - a condition characterized by a body core temperature below 350 C.
Body core - refers to brain, heart ,lungs, blood, liver, kidneys. Critical areas for heat loss - head and neck, sides of chest, groin Shivering will cease when core temperature (Tc) falls below 32-340 C.
Death occurs when Tc drops to 24-280 C. Factors associated with hypothermia: . Immersion in cold water or wet clothing . Wind . Physical exhaustion . Inadequate clothing for conditions . Low percent body fat . Hypoglycemia . Alcohol consumption - causes a decrease in shivering, increased blood ﬂow to
skin, impairs judgement \lO\U1-I>UJI\J>—‘ Hypothermia causes the oxyhemoglobin dissociation curve to shift to the left 9
increased hemoglobin affinity for 02 9 less 02 is released to the tissues 9 body tissues shift to anaerobic metabolism 9 hypoxia of heart and brain plus metabolic acidosis 9 depressed brain function and cardiac output 9 ventricular fibrillation
and death ...
View Full Document
- Fall '09