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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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The present study shows the ECG changes that attributed to the acute RV pressure loading states (Premature atrial contraction, right axis deviation, indeterminate axis, incomplete RBBB, late R in aVR, qR in V1) may be more prevalent in patients with chronic pressure loading states.
Symptomatic bradycardia caused by premature atrial contractions originating from right atrial appendage.
Similarly, more than 30 premature atrial contractions (PACs) in 1 hour were labelled as frequent PACs.11 Run of supraventricular tachycardia (SVT) was labelled if more than 20 consecutive complexes were recorded on Holter.11 Sinus pauses and heart rate (minimum, maximum and average) of all patients were also documented.
The patient's subsequent ECGs demonstrated various cardiac arrhythmias including sinus rhythm with premature atrial contractions, sinus arrhythmias, and multifocal atrial tachycardia (Figure 2) which spontaneously resolved.
The study, published in the Journal of the American Heart Association, found no significant associations between the intake of coffee, tea or chocolate (which contains varying amounts of caffeine) and the hourly rate of premature atrial contractions or premature ventricular contractions.