What condition is Malignant Hyperthermia?

• A. A chronic digestive disorder in horses
• B. A life-threatening condition triggered by certain anesthesia drugs
• C. A mild fever that resolves on its own
• D. A genetic eye disease

Answer: (D)

Malignant Hyperthermia is a life-threatening reaction triggered by certain anesthesia drugs. In susceptible individuals, exposure to volatile inhaled anesthetics or the muscle relaxant succinylcholine causes a sudden, uncontrolled release of calcium inside skeletal muscle cells. This sets off a hypermetabolic crisis: rapid rise in body temperature, severe muscle stiffness, increased carbon dioxide production, acidosis, fast heart rate, and potential organ failure. It’s a genetic predisposition, often linked to mutations affecting the calcium-handling machinery in muscle (like the ryanodine receptor), and requires immediate treatment with dantrolene, stopping the triggering agents, and intense supportive care to cool and stabilize the patient.

This isn’t a chronic digestive disorder, a mild fever that resolves on its own, or a genetic eye disease, which is why the other descriptions don’t fit.