Differentiating SVT Chest Pain from Acute Coronary Syndrome

Initial Assessment and Diagnosis

The American College of Cardiology recommends obtaining a 12-lead ECG within 10 minutes of presentation for any patient with chest pain, as this can help differentiate between SVT and ACS 1, 2, 3
The European Society of Cardiology suggests that a regular, narrow-complex tachycardia with a heart rate typically >150 bpm in adults is indicative of SVT, whereas ACS is characterized by ischemic ECG changes and elevated biomarkers 6

SVT is characterized by a regular, narrow-complex tachycardia (QRS <0.09 seconds) with heart rate typically >150 bpm in adults, >180 bpm in children, >220 bpm in infants, and P waves may be absent, buried in QRS, or seen at the end of QRS complex 4, 5
ACS is characterized by ST-segment elevation (STEMI) or ST-segment depression/T-wave inversions (NSTE-ACS), and may have normal or nondiagnostic ECG initially, but this does not rule out ACS 1, 2, 3, 6

The American Heart Association notes that SVT typically terminates abruptly with vagal maneuvers or adenosine, whereas ACS shows no termination of rhythm and chest pain persists despite rate control 4, 5, 6, 7

The American College of Cardiology recommends measuring cardiac troponin (preferably high-sensitivity) as soon as possible after ED presentation, as elevated troponins with a rising or falling pattern over serial measurements are indicative of ACS 1, 2, 3, 6
The European Society of Cardiology suggests that troponins are typically normal in SVT, unless the SVT has been prolonged enough to cause demand ischemia 3, 6

The American College of Cardiology states that ACS typically presents with chest pain as the primary symptom, which may radiate to the arm, jaw, or back, and may be accompanied by diaphoresis, dyspnea, or nausea 1, 2, 6
The European Society of Cardiology notes that SVT may present with sudden onset of palpitations and chest discomfort, but symptoms terminate abruptly when the rhythm converts 4, 5, 7

The American Heart Association recommends pursuing ACS evaluation if any high-risk features are present, including elevated troponin levels, persistent chest pain after rhythm conversion, hemodynamic instability, diabetes mellitus, known coronary artery disease, or ECG changes suggesting ischemia 6, 3

The American College of Cardiology suggests an algorithmic approach to differentiating SVT from ACS, including obtaining a 12-lead ECG within 10 minutes, attempting vagal maneuvers if regular narrow-complex tachycardia is present, and measuring troponin levels and pursuing ACS evaluation if high-risk features are present or if chest pain persists after rhythm conversion 1, 2, 3, 4, 5, 6, 7