Control Group (conventional protocol) The patient with high or intermediate risk for coronary artery disease (CAD) as defined by Agency for HealthCare Policy and Research guidelines for Unstable Angina was admitted. The indicators for coronary artery disease are definite angina, T wave inversion> 1 mm in leads with dominant R waves and diabetes. If in doubt, patients were also admitted. Patients who were discharged from the ED will be reviewed by a cardiologist at the NHC cardiac clinic within two weeks.