Desflurane-Induced Delayed Onset of Malignant Hyperthermia: A Case Report.

Malignant hyperthermia (MH) is a rare but life-threatening pharmacogenetic disorder triggered by volatile anesthetics and/or depolarizing muscle relaxants, resulting in a hypermetabolic crisis. We report a case of postoperative fulminant MH in a 26-year-old man who underwent general anesthesia with desflurane and rocuronium for mandibular fracture repair. Despite a history of multiple uneventful anesthetics, the patient developed acute hypercapnia, tachycardia, muscle rigidity, and rapid hyperthermia during emergence, following sugammadex administration. Initial treatment for presumed bronchospasm and postoperative shivering-including sevoflurane sedation, hyperventilation, and inhaled bronchodilators-proved ineffective. A clinical diagnosis of MH was made based on the progression of clinical findings, and treatment with intravenous dantrolene 100 mg, active cooling, and antipyretics was initiated. The patient responded well to intervention and recovered without sequelae. This case highlights the importance of considering MH even in the postoperative phase, particularly with the use of desflurane and potentially contributory agents such as sugammadex and ondansetron. Early clinical suspicion, rapid administration of dantrolene, and supportive measures are critical for favorable outcomes. Anesthesia providers must remain vigilant for MH at all perioperative stages and ensure that emergency protocols, appropriate drug stock, and staff readiness are in place.