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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 normal
QRS morphology of early complex is similar to regular QRS
Early QRS is not preceded by a P wave
If QRS morphology of the early complex is not similar to the regular QRS
and there is no preceding P wave, the diagnosis is premature ventricular
contraction
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Premature atrial contraction
Prematuure ventricular contraction
Wandering atrial pacemaker
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