HACE stands for which condition associated with high-altitude illness?

• A. Hyperactive Airway Cerebral Edema
• B. Hypoxic Acute Cerebral Epilepsy
• C. Hemorrhagic Arterial Cerebral Edema
• D. High-Altitude Cerebral Edema

Answer: (D)

High-altitude illness can progress to a serious brain problem when oxygen is scarce at high elevations. HACE stands for High-Altitude Cerebral Edema, which is the recognized name for the severe swelling of brain tissue due to hypoxia. This matches the acronym by using the initial letters to form the full term, and it’s the term used in EMS and medical guidance for this condition. HACE is a medical emergency, since brain swelling can rapidly lead to confusion, loss of coordination, and coma; the essential response is rapid descent to lower altitude, administer oxygen, and provide supportive care such as dexamethasone if indicated. The other phrases don’t reflect the standard medical term for this altitude-related brain edema, so they don’t fit as the correct expansion of the acronym.