|Fourth Heart Sound
|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.
|Low pitch extra heart sound at late diastole or early systole. Increases with
forced inspiration, exercise, elevation of legs, and with increased venous return.
Y.E. Kocabasoglu and R.H. Henning
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