Management of Right-Sided Chest Pain with Normal ECG

Diagnostic Approach

The American Heart Association recommends immediately measuring serial cardiac troponins and performing repeat ECGs, as a single normal ECG is insufficient to exclude acute coronary syndrome (ACS), with up to 6% of patients with evolving ACS being discharged from the emergency department with a normal initial ECG 1, 2, 3
The American College of Cardiology suggests obtaining high-sensitivity cardiac troponin (cTn) immediately if not already done, as troponin is the most sensitive test for diagnosing acute myocardial injury and is necessary to implement appropriate therapy 1, 2
Repeat troponin measurement at 6-12 hours from symptom onset to detect rising or falling patterns that indicate myocardial injury 3, 4, 5

The American Heart Association recommends performing repeat ECGs immediately if symptoms recur, persist, or if the clinical condition deteriorates, as ongoing symptoms increase the likelihood of capturing evolving ischemic changes 1, 2, 3, 6
Continue serial ECGs every 15-30 minutes during the first hour if symptoms persist, even if the patient is currently pain-free 4

High-risk features requiring immediate intervention include recurrent or persistent ischemic chest pain despite medical therapy, dynamic ECG changes on serial tracings, positive second troponin measurement or rising pattern, hemodynamic instability, life-threatening arrhythmias, and new or worsening heart failure 4, 5, 7
Low-risk criteria allowing potential discharge with outpatient follow-up include no recurrent chest pain after 6-12 hours of observation, normal or unchanged ECG on serial testing, two negative troponin measurements, and no high-risk features present 4, 6, 7

The American College of Cardiology recommends admitting patients with high-risk features to the hospital with continuous cardiac monitoring and considering urgent coronary angiography 4, 5
For intermediate-risk patients, continue observation in the chest pain unit or ED with serial ECGs and troponins until the 6-12 hour mark; consider anatomic or functional testing before discharge 4, 5, 7
For low-risk patients with negative serial testing, consider an early stress test to provoke ischemia before discharge, with outpatient follow-up within 72 hours 7