| Symptom | Study Population with Symptom (%) | SCA Victims with Symptoms before Their Most Recent Physician Visit (%) | Events, n (range) | Symptom Onset before SCA (months) |
|---|---|---|---|---|
| Fatigue | 44 | 25 | NA | 21 |
| Near-syncope/lightheadedness | 30 | 22 | NA | 30 |
| Chest pain/discomfort | 28 | 20 | NA | 26 |
| Palpitations | 28 | 17 | NA | 25 |
| Heart murmur | 24 | — | NA | 89 |
| Shortness of breath | 23 | 20 | NA | 19 |
| Tire more easily than friends | 22 | — | NA | NA |
| Syncope | 18 | 14 | 2.3 (2–5) | 47 |
| Unexplained seizure activity | 13 | 11 | 2.9 (1–10) | 71 |
| Decrease in physical activity | 11 | — | NA | NA |
| Hypertension | 3 | — | NA | 25 |
| One of the above symptoms | 72 | 51 | — | — |
↵* Timing of symptoms related to most recent physician visit and SCA is provided.
NA, not applicable.