The Danish study, in today's New England Journal of Medicine, is the latest to prompt U.S. doctors and health-care providers to rethink how they supply emergency heart attack care. Most U.S. hospitals don't provide emergency angioplasties because the procedure requires additional equipment and staff. The USA, unlike Denmark, doesn't have a national health system designed to rush patients to hospitals that perform emergency angioplasties. As a result, doctors are reluctant to risk delaying crucial treatment.