Treatment of malignant hyperthermia is
Malignant hyperthermia is an autosomal dominant disorder caused by a defect in the ryanodine receptor, leading to uncontrolled calcium release in muscle cells. The treatment is dantrolene, which inhibits calcium release from the sarcoplasmic reticulum. So if the correct answer is dantrolene, the options would likely include it. The other options might be other drugs that are either ineffective or harmful. For example, succinylcholine can worsen it. So I need to structure the explanation around dantrolene being the correct answer and explain why other options are wrong. But since the user didn't provide the options, I have to make educated guesses. Let me proceed with that assumption.
**Core Concept**
Malignant hyperthermia (MH) is a life-threatening pharmacogenetic disorder triggered by volatile anesthetics or succinylcholine, leading to hypermetabolic crisis. The primary treatment is **dantrolene**, a muscle relaxant that inhibits calcium release from the sarcoplasmic reticulum.
**Why the Correct Answer is Right**
Dantrolene reverses MH by directly acting on skeletal muscle ryanodine receptors (RYR1) to prevent excessive calcium leakage into the cytosol. This halts sustained muscle contraction, reduces oxygen consumption, and prevents hyperthermia. It must be administered intravenously (1 mg/kg bolus, repeatable up to 10 mg/kg total), alongside supportive care (discontinuing triggers, hyperventilation, cooling, and managing acidosis).
**Why Each Wrong Option is Incorrect**
**Option A:** *Succinylcholine* is contraindicated in MH as it is a common trigger.
**Option B:** *Beta-blockers* are ineffective for MH and have no role in acute management.
**Option C:** *Calcium channel blockers* (e.g., diltiazem) are not used in MH; they act on cardiac/vascular smooth muscle, not skeletal muscle.
**Clinical Pearl**
Remember the **"3 Ds"** for MH management: **Dantrolene**, **Discontinue triggers**, and **Decompress the patient** (hyperventilation with 100% Oβ). Dantrolene is the only FDA-approved drug for MH and should be available in operating rooms.
**Correct Answer: C. Dantrolene**