NAUI Master Scuba Diver 130 Diving Physiology 2. Moderate Chilling. Core temperature 35°C/95°F to 36.1°C/97°F. Confusion, apathy or uncooperativeness, and difficulty with speech. 3. Severe Chilling - True Hypothermia. Core temperature 32.2°C/90°F to 35°C/95°F. Increasing muscular incoordination, stumbling, shivering slows or stops, weakness, apathy, drowsiness, confusion, and slurred speech. Mountain climbers like to summarize signals which indicate changes in motor coordination and consciousness as the “-Umbles.” The person stumbles, mumbles, fumbles, and grumbles. 4. Severe Hypothermia. a. Core temperature below 32.2°C/90°F. From 29.4°C/85°F to 32.2°C/90°F: Shivering stops, inability to walk or follow commands, paradoxical feeling of warmth sometimes leading to removing clothing, loss of vision, and confusion progressing to coma. b. From 29.4°C/85°F to 18.3°C/65°F. Muscle rigidity; decreased blood pressure, heart rate, and respiration; dilated pupils; appearance of death. c. Below 18.3°C/65°F. Same as above only worse. First Aid: For mild or moderate chilling, get out of the water, go to a warm place, bundle up in dry clothes, and drink warm, non-alcoholic, non-caffeinated liquids. Don’t smoke, as nicotine is a vasoconstrictor. Eat a hot meal. Chilling that progresses further is a medical emergency. The cold heart is sensitive, and a diver with hypothermia may develop heart arrhythmias and full arrest if handled roughly. You can harm or kill a hypothermic diver through careless handling and improper attempts at rewarming. The severely hypothermic diver may be unconscious or appear dead. Check carefully for breathing and pulse when determining if artificial respiration or CPR is needed. Get good training to learn how to transport and rewarm without causing cardiac arrest. There is debate whether warming should be done in the field before transport. There is some consensus that immediate transport for rewarming in a medical setting NO H.E.L.P. H.E.L.P. HUDDLING FIGURE 4-19. H.E.L.P. POSITION
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