How are premature junctional contractions differentiated from ventricular premature complexes (VPCs)?

Updated: Nov 26, 2016
  • Author: Jatin Dave, MD, MPH; Chief Editor: Jose M Dizon, MD  more...
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Answer

The origin of this arrhythmia is automaticity or reentry in AV junctional tissues. The P waves usually are inverted because of retrograde atrial depolarization. If the ectopic beat originates in high nodal tissue, the QRS complex can be narrow.


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