No S4

What does "No S4" 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

"No S4" in medicine refers to the absence of a specific heart sound that doctors listen for when examining a patient. Normally, the heart makes four sounds as it beats, labeled S1, S2, S3, and S4. The S4 sound is not usually heard in healthy people, so "No S4" means that the doctor did not hear this sound, which is a normal finding.

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