A 42-year-old businessman known to have type 2 diabetes and ischemic heart disease is admitted to hospital with acute coronary syndrome. He admits to drinking 4 beers a day for the last 6 years and to binge drinking twice a year when his school buddies are in town. Your chart review reveals that he had a seizure secondary to alcohol withdrawal during his last admission. Which one of the following elements of his history puts him at highest risk of having another such seizure?
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