Ventricular Dysrhythmias

  1. Inherent rate of the ventricles
    20-40 bpm
  2. Premature Ventricular Complexes (PVCs)
    • Originate from an irritable focus in the ventricles. Occur early, before the next expected beat in the rhythm.
    • QRS is equal to or greater than (≥) 0.12 second
  3. Unifocal/UniformPVCs
    Same shape in the same lead & originate from the same site (focus)
  4. Multifocal/MultiformPVCs
    Different shapes in the same lead & usually originate from different sites (foci)
  5. Pairs or Couplets
    2 sequential PVCs (in row)
  6. Runs(bursts or salvos)
    3 or more sequential PVCs are called “ventricular tachycardia” (VT)
  7. Bigeminy
    normal beats & premature beats occur alternately in repeating pattern
  8. R-on-T PVCs
    When R wave of PVC falls on T wave of preceding beat (Vulnerable period)
  9. Ventricular Escape Beat
    • Wide, bizarre ventricular beat that occurs after a pause in rhythm if supraventricular pacemakers fail to initiate an impulse.
    • Appears late, after the next expected beat in underlying rhythm.
  10. Idioventricular Rhythm (IVR)
    Three or more sequential ventricular escape beats occurring at a rate of 20 to 40 beats/min.
  11. Accelerated Idioventricular Rhythm (AIVR)
    Rate of 40 - 100 bpm
  12. Ventricular Tachycardia (VT)
    • •VT exists when 3 or more PVCs occur in a row at >100 bpm.
    • Non-sustained VT: lasts < 30 seconds
    • Sustained VT: lasts > 30 seconds
  13. Ventricular Fibrillation (VF)
    Originates in the ventricles.  No organized depolarization of the ventricles, so ventricular muscle quivers, & no effective contraction, no CO & no pulse.
  14. Asystole (Flat Line, Cardiac Standstill)
    • Asystole is a total absence of ventricular electrical activity.  No HR or rhythm, no pulse, & no CO.
Card Set
Ventricular Dysrhythmias
Ventricular Dysrhytmias