Atriyal Couplet
Diagnostic criteria
  The presence of two consecutive atrial premature beats.
  The shape of P wave of premature beat is different from that of the sinus P wave.
  Premature atrial beats are generally conducted to ventricles in a normal fashion, resulting in narrow QRS complexes.
  If a premature beat comes very early, it may be conducted to ventricles with aberration, resulting in a wide QRS complex.
ECG 1. Atrial couplet observed during Holter recording. The QRS complexes of
the premature beats are narrow and have
P waves with shapes different than those of the sinus beats.
To the left, a ventricular premature beat (VPS) is observed with a
full compensatory pause: 632 + 648 = 546 + 734.
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ECG 2. The ECG above was recorded during acute inferior wall myocardial infarction. Atrial couplet is seen.
The
P waves of the atrial extrasystoles
have a different configuration than
sinus P waves.
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ECG 3. The ECG above belongs to a 64 years-old man with coronary artery disease and paroxysmal attacks of ectopic
atrial tachycardia.
Two consecutive P waves with different shapes
(
two consecutive atrial premature beats
) denote
atrial couplet.
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