Defibrillation

Objectives

  • Explain the physiological response to defibrillation
  • Identify the need for emergency defibrillation
  • Demonstrate the safe application of defibrillation

Underlying principle of defibrillation

A defibrillation shock produces simultaneous depolarisation of a mass of myocardial cells and may enable resumption of organised electrical activity.  ANZCOR Guideline 11.4, 2024This electrical current passing through the myocardium is able to terminate ventricular fibrillation and pulseless ventricular tachycardia, permitting the normal electrical pathway of the myocardial cells to resume.

Defibrillation does not “start” the heart, it briefly stops cardiac electrical activity (e.g.: VF/VT).  It is then hoped the normal pacemaker of the heart will resume firing and produce an effective rhythm.  However this outcome is not guaranteed.

Indications

  • Pulseless Ventricular Tachycardia
  • Ventricular Fibrillation

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