EurekAlert! -- A study based on a contemporary registry of patients with myocardial infarction (heart attack) indicates that even though hospitals that perform a higher number of angioplasties are more likely to follow evidence-based guidelines and have shorter times to the angioplasty procedure, there appears to be no significant difference in outcomes such as length of hospital stay or risk of death, according to a study in the November 25 issue of JAMA.