In malignant hyperthermia, which medication is given intravenously to reverse the process?

In malignant hyperthermia, which medication is given intravenously to reverse the process?

• A. Dantrolene IV
• B. Epinephrine
• C. Atropine
• D. Naloxone

Answer: (A)

Malignant hyperthermia is driven by an uncontrolled release of calcium from the skeletal muscle stores, causing a rapid, dangerous rise in metabolism and temperature. The medication that reverses this process is given intravenously because it directly interrupts that calcium release mechanism. Dantrolene works by inhibiting the ryanodine receptor on the sarcoplasmic reticulum, which reduces calcium flux into the muscle, stops the excessive contraction, and halts the hypermetabolic cascade. This IV antidote is what makes MH treatment effective in the acute setting, often started with an initial dose around 2.5 mg/kg IV and repeated as needed up to a total of about 10 mg/kg. Epinephrine, atropine, and naloxone do not address the fundamental calcium mishandling occurring in malignant hyperthermia. Epinephrine is used for anaphylaxis or certain cardiac emergencies, atropine for bradycardia, and naloxone for opioid overdose. In MH management, you also stop triggering agents, provide 100% oxygen, correct acidosis, monitor and manage electrolytes, and implement active cooling as part of comprehensive care.

Malignant hyperthermia is driven by an uncontrolled release of calcium from the skeletal muscle stores, causing a rapid, dangerous rise in metabolism and temperature. The medication that reverses this process is given intravenously because it directly interrupts that calcium release mechanism. Dantrolene works by inhibiting the ryanodine receptor on the sarcoplasmic reticulum, which reduces calcium flux into the muscle, stops the excessive contraction, and halts the hypermetabolic cascade. This IV antidote is what makes MH treatment effective in the acute setting, often started with an initial dose around 2.5 mg/kg IV and repeated as needed up to a total of about 10 mg/kg.

Epinephrine, atropine, and naloxone do not address the fundamental calcium mishandling occurring in malignant hyperthermia. Epinephrine is used for anaphylaxis or certain cardiac emergencies, atropine for bradycardia, and naloxone for opioid overdose. In MH management, you also stop triggering agents, provide 100% oxygen, correct acidosis, monitor and manage electrolytes, and implement active cooling as part of comprehensive care.