premature atrial contraction

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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.
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Researchers at the University of California, San Francisco, reported this month in Annals of Internal Medicine that people with a high rate of premature atrial contractions, which can be detected by a Holter monitor worn for 24 hours, face a significantly increased risk of developing A-fib.
any kind of atrioventricular or intraventricular conditions or blocks such as complete left or right bundle branch block, AV node block, QTc or PR prolongation, premature atrial contractions or other atrial arrhythmia, sustained ventricular arrhythmia, two premature ventricular contractions in a row, ST elevation consistent with ischemia)
A Holter monitor demonstrated evidence of increased supraventricular ectopy, with 157 [+ or -] 34 premature atrial contractions per hour during the 3 hr immediately preceding the exposure to GAPs.
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.