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A 61-year-old woman presented to the emergency department after experiencing palpitations, shortness of breath, and syncope while taking a shower. Her husband revived her with mouth-to-mouth resuscitation. She had had a similar episode three days earlier while making her bed and had lost consciousness for about 10 sec. She did not appear to have had a seizure. Five months earlier, while taking a walk, she had experienced dizziness, dyspnea, and chest pressure lasting about an hour. A workup at that time included cardiac catheterization, lung scanning, and esophagogastroduodenoscopy, but no abnormality was found. Lower extremity edema was noted.

A 58-year-old man presented with profuse diarrhea, abdominal distention, flatulence, weakness, and a 15-lb weight loss. The initial symptoms of nausea and vomiting had begun a week earlier, within hours of eating chicken that had not been well wrapped when purchased. Two days after symptom onset, he received intravenous rehydration therapy at another hospital. With resolution of the nausea and vomiting, he felt slightly better and went home against medical advice. He had not had fever, chills, hematochezia, melena, hematemesis, or dysuria.