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S4 Heart Sound
Manage episode 313651253 series 3279691
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The fourth heart sound, also known as the “atrial gallop,” occurs just before S1 when the atria contract to force blood into the LV. If the LV is noncompliant, and atrial contraction forces blood through the atrioventricular valves, a S4 is produced by the blood striking the LV.
A S4 heart sound occurs during active LV filling when atrial contraction forces blood into a noncompliant LV. A S4 heart sound is often a sign of diastolic HF, and it is rarely a normal finding (unlike a S3).
S4 – “atrial gallop”
- Occurs in late diastole
- Occurs during active LV filling
- Almost always abnormal
- Requires a noncompliant LV
- Can be a sign of diastolic congestive HF
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