A condition in which the cadence of the heart sounds resembles that of the fetus, the first and second sounds becoming alike and evenly spaced; a sign of serious myocardial disease. SYN: pendulum rhythm, tic-tac rhythm, tic-tac sounds. [embryo- + G. kardia, heart]
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em·bryo·car·dia .em-brē-ō-'kärd-ē-ə n a symptom of heart disease in which the heart sounds resemble those of the fetal heart
Medical dictionary. 2011.