This study will enroll women and men who are hospitalized following a possible heart attack. At study entry, participants will be interviewed to collect information about symptoms, functioning, quality of life, and medical care. A medical record review will also occur. At 1 month after admission from the hospital, an interview will occur via phone and a blood sample will be collected when the participant returns to the hospital or alternatively be collected at a medical clinic convenient to the participant. Another telephone interview will occur at 12 months. Participants' blood samples will be stored for future biologic and genetic studies.