Your patient is a 15 year old girl who is lying in the left lateral recumbent position on the living room floor. The patient's friend, the only other person in the house, reports that about 15 minutes ago the patient and her were laying on the floor watching television when her friend began to “act funny and flop around.” This lasted for about two minutes. The friend reports a second episode, also about two minutes in length, which occurred approximately 10 minutes before your arrival. Your initial assessment reveals the patient is unresponsive, has pulse rate is 98, and a respiration rate of 18. B/P is 108/74. She is breathing deeply and shows no signs of an airway obstruction. Her skin is pink, cool and moist. Based on this information, what type of medical event has most likely occurred?"