premature atrial contraction(redirected from Premature atrial contractions)
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Related to Premature atrial contractions: Premature ventricular contractions
premature atrial contraction
n. Abbr. PAC
An ectopic heartbeat that originates in the atria and precedes a typical atrial contraction.
pre·ma·ture a·tri·al con·trac·tion(PAC) (prē'mă-chŭr'ā'trē-ăl kŏn-trak'shŭn)
A premature cardiac beat arising from an ectopic atrial focus.