Medically reviewed by Jeffrey S. Lander, MD Key Takeaways S1 and S2 are the normal heart sounds you hear when the heart ...

A third heart sound, or S3, is a low-frequency, extra heart sound that may be heard with a stethoscope right after the normal S1 and S2 heart sounds. S1 and S2 are the "lub-dub" sounds of a heartbeat ...

Heart auscultation by primary care providers detected heart murmurs in nearly 1 in 4 individuals in a Norwegian population. While murmurs were particularly useful for detecting aortic stenosis, their ...