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.

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 ?
Premature ventricular complexes were the most common abnormal finding during the study followed by premature atrial contractions. This finding was similar to previous studies and matched adult data having PVCs in most cases.9 Pallor and shortness of breath during palpitation were significantly associated with occurrence of supraventricular tachycardia or premature atrial complexes (p<0.001).
For instance, premature atrial contractions, though generally benign, can serve as a trigger for supraventricular tachyarrhythmia as well as they may cause the heart to beat inefficiently and cause symptoms if there frequency exceeds 15-20/minute.11
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)
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. A positive response to the Valsalva maneuver or to adenosine is typically characteristic of reentrant tachycardias using the AV node, such as AVNRT and AVRT.
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.
Premature supraventricular contractions or premature atrial contractions (PAC).
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.
Such symptoms usually stem from benign premature atrial contractions (PACs) or premature ventricular contractions (PVCs).