S1

What does "S1" mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.

Explanation

"S1" in medicine refers to the first heart sound that doctors listen for when examining a patient's heart. It's the sound that the heart makes when the two upper chambers close to push blood into the lower chambers. This sound is often described as a "lub" in the "lub-dub" pattern that is commonly associated with a heartbeat.

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