HEART Score Calculation
The HEART score is calculated by assigning 0,1, or 2 points to each of five components: History, ECG, Age, Risk factors, and Troponin, with a maximum total of 10 points. 1
Score Components
History (H): 0-2 points
- 0 points: Slightly suspicious presentation
- 1 point: Moderately suspicious presentation
- 2 points: Highly suspicious for acute coronary syndrome (ACS)
ECG (E): 0-2 points
- 0 points: Normal/no abnormalities
- 1 point: Non-specific repolarization changes
- 2 points: Significant ST-segment deviation (not meeting STEMI criteria)
Age (A): 0-2 points
- 0 points: <45 years
- 1 point: 45-64 years
- 2 points: ≥65 years
Risk Factors (R): 0-2 points
- 0 points: No known risk factors
- 1 point: 1-2 risk factors (hypertension, hyperlipidemia, diabetes, smoking, family history, obesity)
- 2 points: ≥3 risk factors or history of atherosclerotic disease
Troponin (T): 0-2 points
- 0 points: Below normal limit
- 1 point: 1-3× normal limit
- 2 points: >3× normal limit
Risk Stratification
Low Risk (0-3 points): 0.4-2.5% risk of 30-day MACE - appropriate for discharge without admission 1, 2
Intermediate Risk (4-6 points): 11.6-20.3% risk of 30-day MACE - requires observation and further testing 1, 2
High Risk (7-10 points): 52.6-72.7% risk of 30-day MACE - warrants early invasive strategy 1, 2
Clinical Performance
The HEART score demonstrates excellent diagnostic accuracy with:
- 100% sensitivity for acute myocardial infarction when using conventional troponin 2
- 95% sensitivity for 30-day MACE when using high-sensitivity troponin 2
- C-statistic of 0.83-0.87 for predicting adverse outcomes 3, 4, 5
Important Caveats
Serial troponin measurement is essential - the HEART score requires troponin testing at 0 and 3 hours (or 0 and 2 hours with high-sensitivity troponin) 1, 6. A single troponin value alone is insufficient for accurate risk stratification.
Subjective components limit reproducibility - the History component relies on clinical judgment and may vary between providers 6, 7. Recent evidence suggests that with high-sensitivity troponin, ECG and troponin alone may provide comparable predictive value to the full HEART score 8.
Not validated for all populations - performance may differ in elderly patients, those with chronic kidney disease, or early presenters (<3 hours from symptom onset) 6.
The HEART score is endorsed by the 2021 AHA/ACC/ASE/CHEST/SAEM/SCCT/SCMR Chest Pain Guidelines as a validated clinical decision pathway for emergency department risk stratification 2, 9.