Third heart sound
The third heart sound or S3 is a rare extra heart sound that occurs soon after the normal two "lub-dub" heart sounds (S1 and S2). S3 is associated with heart failure.
| Third heart sound | |
|---|---|
| Other names | Ventricular gallop, protodiastolic gallop |
| Diagram of the heart. | |
| Specialty | Cardiology |
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