Heat stroke is hyperthermia with neurological dysfunction due to the failing thermoregulatory system; rectal temperature exceeds 40.6°C (definition varies between authors — in practice, don't be too strict especially if prehospital cooling performed)
Decompression sickness, is a form of decompression illness, where a reduction in ambient pressure ('decompression') leads to de no intravascular and extravascular bubble formation with pathological consequences