Abstract
We report an unusual case of an 82-year-old female who developed acute respiratory distress, tachycardia, diaphoresis, and hypertension in the post-anesthesia care unit (PACU) following transcatheter aortic valve replacement (TAVR), which improved significantly after initiation of dantrolene. Given the patient's atypical age, delayed symptom onset, and notable improvement following dantrolene administration, we present an atypical case in which malignant hyperthermia (MH) could not be ruled out based on clinical progression. This case underscores the importance of maintaining a high index of suspicion for MH in atypical presentations and highlights the critical role of timely diagnosis and intervention.