What is it?

Malignant hyperthermia refers to an inherited reaction triggered by anesthesia. This reaction may be severe and include high body temperature, muscle spasms, and rapid heart rate. Typically, those who develop this reaction inherit a mutated gene which causes them to be susceptible to anesthesia.

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Signs & symptoms

Symptoms include high body temperature, muscle spasms, rapid breathing, irregular heart rhythm, sweating, irregular skin color and rapid heart rate in response to anesthesia use.


Diagnosis is based upon symptoms presented after the use of anesthesia. Then, genetic testing may be performed.


Malignant hyperthermia is treated with dantrolene, oxygen, body cooling, fluids and supportive care.

☝️ This is not a substitute for professional medical advice. Please consult with your physician before making any medical decision.

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