premature atrial contraction


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Related to premature atrial contraction: 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.
References in periodicals archive ?
The different types of SVA are premature atrial contractions (PAC), supraventricular tachycardia (SVT), sick sinus syndrome (SSS), atrial fibrillation (A-fib) and atrial flutter (AFL).
Using 24-hr beat-to-beat electrocardiographic data obtained using a high-resolution Holter system, the researchers sumarized the total number of premature ventricular contractions (PVCs) and premature atrial contractions for each 30-min segment.
One of them had first-degree atrioventricular block with uniform, rare premature ventricular contractions; one had rare, uniform premature ventricular contractions; one had rare, premature atrial contractions; one had frequent premature ventricular contractions with couplets; and one had premature atrial contractions with short episodes of supraventricular tachycardia.