	Definition: core temp <35C
History	Underlying pathology vs environment exposure (or both)
Pathophysiology	Resp: ↑ gas solubility → ↓ paCO2; metab acidosis → pulm hypertension CVS: ↓ MAP CNS: coma, fixed dilated pupils Metab: L shift on oxygen dissociation curve, ↓ drug metab Haem: ↑ bleeding time/PT/APTT, VTE risk Renal: cold diuresis
Diagnostic investigations	ECG - bradyarrhythmias, J waves/Osborne waves, prolonged QT/QRS intervals, VF/VT/asystolic arrest
Immediate management	Careful handling: hypothermic myocardium is arrhythmogenic See Hypothermic cardiac arrest Passive vs active warming - 'afterdrop' = ↓ core temp as cold peripheral blood is released back to core, but is this really that important ECMO, RRT (???), warm inspired gases

severity grading

#environmental-emergencies #frailty (frailty???? it's the syllabus not me!!!!)

sources/links