Hypothermia delays but does not prevent malignant hyperthermia in mice

A mouse model carrying the RYR1 p.R2509C mutation was used to test whether hypothermia blocks malignant hyperthermia (MH) triggering during sevoflurane exposure. The study reports that all mutant mice developed MH and cardiac arrest regardless of temperature, though survival time was significantly longer at 34°C than 36°C; typical signs like tachycardia were absent at 34°C, but hypercapnia, metabolic acidosis, hyperkalemia, and mitochondrial swelling still progressed. The authors state that hypothermia decelerates clinical progression of MH without preventing triggering or lethality, and that hypercapnia and acidosis may be critical early indicators when tachycardia and temperature elevation are masked.

Most relevant for: Relevant to management of patients with malignant hyperthermia susceptibility undergoing volatile anesthesia, including scenarios involving hypothermic conditions such as cardiopulmonary bypass.

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