Learn about the S3 heart sound, listen to examples, take short lessons and compare to other heart sounds. For all medical professionals.
Our S3 and S4 heart sound lessons can be found in this course. Secondly, our reference index is designed to provide quick access to stridor sounds, with audio tracks, listening guides and waveforms. Use this link for quick reference to heart and lung sounds.
The third heart sound is a short, low frequency sound heard best with the stethoscope's bell. It occurs early in diastole and is dull in quality. As an extra heart sound, it creates a galloping rhythm with a cadence like word 'Kentucky'.
Here we offer a comparison of S3 vs S4 heart sounds.
Listen for a short, low frequency sound early in diastole. Try to match the cadence to 'Kentucky'.
Listen for a cadence like the word 'Tennessee' where the syllable 'Ten' is S4. S4 is usually short and low frequency.