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Hypothermia Redistribution Phase — FRCA Primary MCQ

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ModeratePhysiology - NeurophysiologyHypothermia Redistribution PhaseFRCA Primary

Regarding temperature regulation during general anaesthesia core temperature typically falls in three phases. The initial rapid drop in the first hour is due to:

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Correct answer: A — Redistribution of heat from the core to the periphery due to vasodilation

The initial rapid drop (1-1.5°C in the first hour) is primarily due to redistribution: anaesthesia-induced vasodilation allows warm blood to flow to the cooler periphery equalising core and peripheral temperatures. This is the dominant mechanism. Subsequent slower decline is due to heat loss exceeding metabolic heat production via radiation (dominant) / convection / evaporation / and conduction.

Reference: Power Kam 2018 Principles of Physiology for the Anaesthetist