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This physiological study describes the precordial movements associated with atrial contraction, noting exaggerated backward movement in mitral stenosis and heart failure.
Precordial movements starting after P and before Q have been studied. Right atrial contraction appears to cause a forward-rightward motion and left atrial contraction a backward movement of the precordium. The latter is exaggerated in most patients with mitral stenosis and in some patients with myocardial failure.
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Harrison et al. (1958) studied this question.
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