A third heart sound (S3), producing a "lubb-dupp-up" pattern, may be produced by a sudden myocardial stretching during rapid ventricular filling.

Name: A third heart sound (S3), producing a "lubb-dupp-up" pattern, may be produced by a sudden myocardial stretching during rapid ventricular filling.
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A third heart sound (S3) is caused by rapid ventricular filling, which causes sudden myocardial stretching, creating a "lubb-dupp-up" pattern.

A Third Heart Sound (S3), Producing a "Lubb-Dupp-Up" Pattern, May