IRCT201304182496N9 IRCT 2013-04-28 Research Vice chancellor of Tabriz University of Medical Sciences Comparison of prediction between TIMI (Thrombolysis in Myocardial Infarction) risk score and Modified TIMI risk score in discharged patients from emergency department with atypical chest pain Comparison of prediction between TIMI (Thrombolysis in Myocardial Infarction) risk score and Modified TIMI risk score in discharged patients from emergency department with atypical chest pain 2011-06-19 anticipated 1000 Complete https://irct.ir/trial/2226 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Prevention. N/A Atypical chest pain. Intervention 1: Group I was evaluated using TRS and its patients were discharged in case of having low risk (0-1). All criteria used in TRS method are of equal values and each score one. These criteria include: 1. increased cardiac markers: measurements of T troponin 12 hours after the primary chest pain onset 2. Ischemic ECG: ECG registration on admission 3. Age>65 4. Continuous administration of aspirin or history of consumption within previous seven days 5. three risk factors: patients should have at least three risk factors including diabetes mellitus, hypertension, hyperlipidemia, and familial history of cardiac diseases in the close relatives before the age of 65 years and smoking history within six previous weeks 6. previously-diagnosed cardiovascular stenosis 7. severe symptoms: two or more episodes of chest pain within the previous 24 hours or pain duration of more than one hour. Intervention 2: Patients in group II were evaluated regarding their risk factors using MTRS method and were discharged in case of having low risk (0-1). The criteria used in MTRS system are similar to that of TRS. The only difference is scoring is between 0-10 and a score of 5 has been considered for ECG or cardiac biomarker changes (items seven and six) in case of being positive (all together or separately).