premature atrial contraction

(redirected from Atrial premature complexes)
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premature atrial contraction

n. Abbr. PAC
An ectopic heartbeat that originates in the atria and precedes a typical atrial contraction.
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1 mV = 5 mm, showed sinus rhythm with atrial premature complexes, biatrial enlargement, left axis deviation of the QRS complex (-35[degrees]), and left ventricular hypertrophy with repolarization abnormality, including a long QT interval (405 ms with a QTc of 473 ms).
Nonconducted atrial premature complexes after every second QRS AV indicates atrioventricular; SA, sinoatrial.
This raises the possibility of atrial bigeminy with the atrial premature complexes being conducted to the ventricles with aberration of the left-bundle-branch-block type.

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