Evaluation of Persistent Chest Pain with Normal ECG and Negative Troponin

Immediate Management Steps

The American College of Cardiology recommends performing serial troponin measurements at 6-12 hours from symptom onset and repeat ECGs, particularly if symptoms persist or recur, as dynamic ECG changes can indicate high-risk acute coronary syndrome even with initially negative troponins 1, 2
Obtain a second troponin measurement 6-12 hours after symptom onset, as this is the critical timeframe for detecting myocardial injury that may not be evident on initial testing 1, 3, 4
Perform serial ECGs if symptoms persist, change, or recur, as dynamic ECG changes indicate high-risk status even with negative troponins 1, 2
The European Heart Journal suggests initiating aspirin 75-150 mg daily, beta-blockers, and nitrates for persistent or recurrent chest pain, and considering low-molecular-weight heparin during the observation period 2, 3, 4

If any high-risk features develop during observation, such as persistent or recurrent ischemic chest pain, dynamic ECG changes, positive second troponin measurement, hemodynamic instability, or life-threatening arrhythmias, proceed to coronary angiography 3, 4
The European Heart Journal recommends that if after 6-12 hours the patient has no recurrent chest pain, normal or unchanged ECG, and twice-negative troponin measurements, then proceed with discontinuing heparin, adding clopidogrel, and performing stress testing before discharge 3, 4, 5

Never rely on a single troponin measurement if drawn less than 6 hours from symptom onset, as myocardial injury may not yet be detectable 1
Do not dismiss subtle ECG changes, particularly pseudonormalization of T-waves, which represents active myocardial ischemia and warrants high-risk classification 2
Supplemental leads V7-V9 are reasonable if posterior MI is suspected despite a nondiagnostic standard 12-lead ECG 1

Patients meeting low-risk criteria can be safely discharged with outpatient stress testing, while any high-risk feature mandates admission and invasive evaluation 2, 3, 4
The European Society of Cardiology emphasizes that dynamic ECG changes, even with negative troponins, require complete cardiac evaluation with stress testing or coronary angiography based on individual risk stratification 2