Fourth Heart Sound
Atrial Gallop

Brief Information
Description An fourth heart sound due to forceful atrial ejection.
Type and Detection Heard over apex; while patient is at at supine or left semilateral position.
Findings on

Low pitch extra heart sound at late diastole or early systole. Increases with forced inspiration, exercise, elevation of legs, and with increased venous return.

Heart Sound
Compare with
Normal Heart Sound (441K)
Third Heart Sound (441K)
Summation Gallop (383K)

Y.E. Kocabasoglu and R.H. Henning

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