The third heart sound or S3 is a rare extra heart sound that occurs soon after the normal two "lub-dub" heart sounds (S1 and S2). The S3 is associated with heart failure.
Read more about Third Heart Sound: Physiology, Causes, Treatment
Famous quotes containing the words heart and/or sound:
“Lady Dellwyn ... for the first time began to entertain some suspicions that she had a heart to bestow. Not that she was actuated by that romantic passion which creates indifference to every other object and makes all happiness to consist in pleasing the beloved person, [but] only overstraining delicacy so much as to feel it almost a crime to charm any other.”
—Sarah Fielding (1710–1768)
“It was the unfailing and characteristic sound of those lakes.”
—Henry David Thoreau (1817–1862)