Rules for Premature Junctional Contraction
Regularity: Since this is a single ectopic beat, the underlying rhythm will be irregular
Rate: The rate depends on the rate of the underlying rhythm.
P WAVE: Usually there will not be a P wave present in front of the premature beat. If there is, it will be inverted. Otherwise it would be considered a PAC. There may or may not be P waves present in the underlying rhythm.
PRI: PRI can only be measured if there is a P wave in front of the premature beat. The PRI in the underlying rhythm will be different than that of the premature beat.
QRS: Measures less than 0.12 seconds.
NSR w/ PJC