Environmental and Physical Injury

Immediate tachycardia and hyperventilation, then polycythaemia and pulmonary hypertension

A memory aid for the circulatory adaptations to high altitude.

Falling barometric pressure lowers inspired oxygen, driving hyperventilation and acclimatisation

A memory aid for the respiratory adaptations to altitude.

Pressure rises by one atmosphere for every 10 metres of seawater

A memory aid for the respiratory effects of increased ambient pressure.

Central nervous system dysfunction defines heat stroke

A memory aid for distinguishing heat exhaustion from heat stroke.

Uneven hypoxic pulmonary vasoconstriction overperfuses some capillaries

A memory aid for the mechanism of high altitude pulmonary oedema.

Graded by core temperature, rewarmed according to severity

A memory aid for grading and rewarming the hypothermic patient.

Four categories, plus unstageable and deep tissue injury

A memory aid for grading and preventing pressure ulcers.

The hypothalamus compares core temperature with a set point and drives heat loss or gain

A memory aid for the control of body temperature.