The purpose of this study is to see whether individuals who access the "911" emergency
medical system with a heart attack or severe chest pain will receive more timely hospital
treatment and better outcomes if hospital clinicians are provided with earlier and more
complete electrocardiography (ECG) information.
This is a Phase III study. Patients will be randomized (like tossing a coin) to 1 of 2
groups: Group 1: Patients will have pre-hospital ECG intervention. Group 2: Patients will
have routine emergency heart care. Information will be collected about time symptoms
started, clinical management, and other measures. All patients will be contacted by
telephone 12 months later and interviewed as to whether they experienced any cardiac
- All individuals in Santa Cruz County in California who call 911 with symptoms of
acute coronary syndrome (chest pain, shortness of breath, anginal equivalent).
- Those who don't meet the above inclusion criteria.