Study Comparing CT Scan and Stress Test in Patients With Known Coronary Artery Disease Hospitalized for Chest Pain

Inclusion Criteria: * patient admitted for chest pain / pressure or other suggestive symptoms * patient has known coronary artery disease (with or without prior revascularization) * patient has clinical need for non-invasive cardiac evaluation Exclusion Criteria: * evidence of ongoing myocardial infarction or hemodynamic instability * ischemia on EKG (greater than 1mm ST segment deviation) * contraindications to CT scanning with iodinated intravenous contrast (including allergies, asthma and renal dysfunction) * heart rhythm precluding EKG gating * pregnancy