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Basic R-R interval is regular but interrupted intermittently
Irregular R-R interval is short (premature QRS)
QRS duration of early complex is usually normal
P wave precedes each QRS complex
P axis or morpholgy is usually different from a regular P wave
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Premature ventricular contraction; premature junctional contraction
Wandering atrial pacemaker, sinus arrhythmia
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