premature atrial contraction

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premature atrial contraction

n. Abbr. PAC
An ectopic heartbeat that originates in the atria and precedes a typical atrial contraction.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

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.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
Sinus arrest, A-V blocks (2nd and 3rd degree), T-wave depression and atrial premature complexes have been reported in bald eagle given Isoflurane anaesthesia (Aguilar et al.,1995).
Table: Electrocardiographic abnormalities in pulmonary embolism Rhythm Sinus tachycardia Atrial premature complexes Atrial flutter Atrial fibrillation Right ventricular premature complexes Ventricular fibrillation Sinus bradycardia or asystole (rarely) P waves Rightward axis ([greater than or equal to] 75[degrees]) Tall (>2.5 mm) in leads II, III, or aVF QRS complex Right axis deviation or rightward axis shift Clockwise rotation Right ventricular conduction delay Right ventricular hypertrophy Pseudoinfarction Inferior Anterior Both Left axis deviation (rarely) ST segment Elevation inferiorly and/or anteriorly Depression T wave Inversion inferiorly Inversion anteriorly QT prolongation Modified from references 2 and 7
A-V junctional premature complexes were treated with in the same manner as atrial premature complexes. Dogs with ventricular premature complex and ventricular tachycardia were attended immediately with 2% xylocaine and from 2nd day onwards propranolol with frusemide were added.

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