hyponatremia
The patient was at a rave party, had seizures, and had physical examination findings consistent with hyperadrenergic toxidrome. Ecstasy (3,4-methylenedioxy-N-methylamphetamine) is a commonly abused "club" drug and causes hyperadrenergic toxicity. It also can cause acute hyponatremia from excess water intake and syndrome of inappropriate antidiuretic hormone.
Reference:
Ly BT, et al. Hallucinogens. In: Marx JA, et al. Rosen's Emergency Medicine. 7th ed., 2009:2010-2018.