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One Quick Question: What are PJCs (Premature Junctional Contractions)? – Video
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Video at a Glance
PJCs are characterized by:
- Regularity: PJC interrupts the underlying rhythm
- Rate: Depends on the rate of the underlying rhythm
- P Wave: P wave preceding the PJC may be before or after QRS or hidden within the QRS
- PR Interval: Normal in underlying sinus rhythm, typically < 0.20 seconds if inverted P wave precedes the QRS; otherwise, no measurable PRI
- QRS Complex: Typically < 0.12 seconds and appears before the next expected beat
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