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Cardiac Dysrythmias

Emergency Nursing

TermDefinition
AV Block (Heart Block) Problem w/ AV Synchrony: More P's than QRS'S, may have PRI > 0.20 sec or variable PRI
1 Degree Heart Block 60-100 beats or less w/ regular rythm. PRI >.20 seconds and qrs <.12 seconds. P:QRS ratio 1:1.(Looks like NSR but PRI is prolonged.
2nd Degree Heart Block Type I (Mobitz I/ Wenckebach) Atrial rate > ventricular rate. P to P wave regular, but R to R is irregular. PRI progressively increases until a QRS is dropped. Qrs <.12 seconds. * Longer, longer, longer drop-Wenckebach!
2nd Degree Heart Block Type II (Cllassical) Atrial rate > ventricular rate. P to P wave regular, but R to R may be regular or irregular. PRI.12-.20 or>,& constant. QRS <.12 seconds unless BBB exsist. P to QRS ratio may be constant at 1:1, 2:1, 3:1 etc or variable.
3rd Degree Heart Block Atrial rate > ventricular rate. P to P & R to R wave regular. PRI varies and is immeasurable. If QRS is junctionally initiated then >.12 if ventricular then <.12 seconds. P:QRS ratio 1:1. P waves burried in QRS or ST segments.
Junctional Rhythms P waves inverted & occur before, during, or after QRS complex, depending on depolarization time.
Premature Junctional Contraction (PJC) Rate depends on underlying rhythm & it interrupts the underlying rhythm. If PRI is measurable it may be .12-.20 seconds. QRS <.12 seconds & P wave will be inverted if seen.
Junctional Escape Rate = 40-60 w/ a regular rhythm & PRI <.12-.20 seconds. QRS is <.12 seconds & P wave will be inverted if seen.
Accelerated Junctional Rate = 60-100 w/ a regular rhythm & PRI <.12-.20 seconds. QRS is <.12 seconds & P wave will be inverted if seen.
Junctional Tachycardia Rate = 100-180 w/ a regular rhythm & PRI <.12-.20 seconds. QRS is <.12 seconds & P wave will be inverted if seen.
1500 Rule Only works for regular rhythms. From P to P or R to R wave (starting with one that falls on a dark line).
Normal Sinus Rhythm (NSR) Must have a P wave. 60-100 bpm
Sinus Bradycardia Must have a Pwave. <60 bpm.
Sinus Tachycardia Must have a P wave. > 100 bpm.
QRS Complex Initiated by the ventricles. 0.06-.12. (1.5-3 small boxes).
Created by: alfgirl