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R-R interval is irregular
R-R interval varies continuously
P-P interval is irregular
P wave axis continously changes (sinus, atrial, junctional)
QRS complexes are related to all P waves
PR interval may vary by up to 0.04 sec
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Premature atrial contraction
Supraventricular tachycardia
Tachycardia-bradycardia ("sick sinus") syndrome
Sinus arrhythmia
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