The fourth heart sound or S4 is an extra heart sound that occurs during late diastole, immediately before the normal two "lub-dub" heart sounds (S 1 and S 2).

Sep 3, 2025 · By interpreting heart sounds, clinicians can identify normal cardiac function, valve closures, and detect early signs of heart disease. Understanding S1, S2, S3, and S4 sounds, …

Oct 11, 2022 · What is the S4 heart sound and what does it indicate? Why listen for S4 sounds? An S4 heart sound is a low-pitched sound that occurs toward the end of the diastole. In some …

Feb 1, 2024 · S4 is an abnormal heart sound. When present, it occurs just before S1 at the end of diastole. We're sharing these excerpts from our Medical Student Core Cardiology book to …

This sound is normal in children, but when heard in adults it is often associated with ventricular dilation as occurs in systolic ventricular failure. The fourth heart sound (S4), when audible, is …

Dec 13, 2025 · Learn when S4 heart sounds are normal. This guide explains causes, diagnosis, and when to seek medical attention for this extra heart sound.

Aug 18, 2025 · Healthcare professionals also describe the S4 heart sound as an “atrial gallop” or “presystolic gallop” due to its rhythmic cadence. The S4 heart sound is produced when the …

Nov 9, 2021 · Learn about S4, the fourth heart sound, listen to examples, take short lessons and compare to other heart sounds. For all medical professionals.

In a healthy adult, the heart makes two sounds, commonly described as ‘lub’ and ‘dub.’. The third and fourth sounds may be heard in some healthy people, but can indicate impairment of the …

Apr 18, 2025 · S4 is a low-pitched "lub-dub-dub" sound that can be heard best with the bell of the stethoscope at the apex of the heart while the patient lies in the left lateral position.