A divided 1st District Appellate Court has affirmed a defense verdict in a medical-malpractice case that initially yielded a $3.7 million jury verdict that was vacated on a post-trial motion. In a 21-page unpublished order written by Justice Mary Anne Mason, the majority found that the jury reasonably concluded an emergency room physician met the standard of care when he discharged a man one day before he died of an aortic dissection. In May 2001, Michael Hamilton was a worker at the Behr Process Corp. plant in …