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| Syndrome | ICD-9 Codes | Chief complaint keywords | Prevalence (%) | Sensitivity | Specificity | PPV |
| Syndrome 1 (Cardiac) | 410–429 | Heart attack | 4.6 | 0.380 | 0.970 | 0.379 |
| 785–786 | CHF | |||||
| Heartbeat | ||||||
| Heart racing | ||||||
| Tachycardia | ||||||
| Angina | ||||||
| Chest pain | ||||||
| Syndrome 2 (Cardiovascular) | 405–441 | Blood pressure | 7.1 | 0.328 | 0.953 | 0.348 |
| 785–786 | Hypertension | |||||
| Heart attack | ||||||
| CHF | ||||||
| Heartbeat | ||||||
| Heart racing | ||||||
| Tachycardia | ||||||
| Angina | ||||||
| CVA | ||||||
| Stroke | ||||||
| Chest pain | ||||||
| Short of breath |
