Specialized, coordinated emergency networks dramatically reduce time-to-treatment for patients with ST-elevation myocardial infarction (STEMI)the most dangerous type of heart attack according to a new study published in the April 2009 issue of the
Journal of the American College of Cardiology: Cardiovascular Interventions.
STEMI involves the sudden blockage of one of the three big coronary arteries that supply blood to the heart. Rapid intervention with primary percutaneous coronary intervention (PCI) by specialists performing balloon angioplasty and stenting restores blood flow, saves heart muscle, and reduces the likelihood of death. Although primary PCI in the cardiac cath lab is the best treatment for a STEMI heart attack, it is a highly complex, multi-disciplinary and time-sensitive intervention that is only available in one out of five U.S. hospitals.
"This study shows that organized STEMI networks consistently provide the fastest treatment of acute heart attacks," said Ivan Rokos, M.D., an emergency physician in Los Angeles and lead researcher on the study. "For decades, paramedics, emergency departments and cardiology teams have co-existed, but we have only recently recognized how important it is to coordinate all three into one seamless unit that that delivers rapid primary PCI and restores blood flow in a blocked coronary."
Researchers performed a pooled analysis of 10 pioneering STEMI heart attack networks involving 72 hospitals in Oregon, California, Minnesota, Michigan, North Carolina and Georgia. Each program independently implemented common approaches including: universal access to 911; pre-hospital diagnosis of STEMI heart attacks by paramedics using special electrocardiograms (ECGs); early activation of the cath lab team at the nearest designated STEMI hospital; and rapid transport via ambulance (with planned bypass of hospitals without specialized cath lab capability).