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 ?
Sinus tachycardias and atrial tachycardias frequently demonstrate a "warm up" in rate, for instance, while AVNRT and AVRT are often triggered by premature atrial contractions.
Her history of premature atrial contractions may also have increased her risk for atrial fibrillation (Binici et al.
Kwon notes that palpitations may be signs of ectopic heartbeats, such as premature ventricular contractions (PVC) and premature atrial contractions (PAC).
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.
Rodrigues implanted an Identity(R) ADx DR Model 5380 device in a 64-year-old female patient who presented with sick sinus syndrome and a history of premature atrial contractions.