S4 heart sound: Definition, uses, and heart health - Medical News Today
https://www.medicalnewstoday.com/articles/s4-heart-sound-definition-uses-and-heart-health
Web ResultOct 11, 2022 · The S4 sound, also known as the atrial sound or S4 gallop, features a low pitch. It is one of two heart sounds, S3 being the other, indicating a potential problem with the heart. S4 sounds...
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