Steroids Harmful for Head Injury Patients By Ed Edelson, HealthDay Reporter    HealthDayNews -- Giving steroids to reduce brain swelling can be deadly for patients with severe head injuries, according to the largest study ever done on the subject.    The research, which included more than 10,000 patients treated at 239 hospitals in 49 countries, found that 21 percent of those who were given steroids died within two weeks, compared to 18 percent of those given a placebo...