68T First Aid for Heat Stroke

Thermoregulation
establishes a set point which may be changed up or down corresponding to hyperthermia or hypothermia

What is the center for thermoregulation control?
anterior hypothalamus

hyperthermia
increase in core body temperature above the normal

What are the four major categories of hyperthermia?
Pyrogenic
Inadequate heat dissipation
exercise hyperthermia
pathologic and pharmacologic

What are the four types of heat dissipation?
evaporation
radiation
convection
conduction

Heat Stress
temp < 106, heavy but controlled panting

heat exhaustion
Temp 106.1-108, uncontrolled panting, dyspnea,

heat cramps
Na+ depletion, muscle cramps

heat stroke
temp > 108. dark mm, vomiting, comatose or dull mentation, weakness

heat prostration
vomiting, tachycardia, hypotension

What is the clinical representation of heat injury?
105 or great rectal temp.
weakness, collapse
rapid pulse
panting
bright red mm
shock
neurological abnormalities
petechaie, ecchymoses
melena, discolored urine

When should cooling be discontinued?
when rectal temp at 103.

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