Lesson 6, Topic 1
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Heart block refers to a group of disorders characterized by variable conduction from the atria to the ventricles.

Heart block can be classified as

  • 1st degree heart block – prolonged conduction across the atrio-ventricular node
  • 2nd degree heart block – failure of SA impulse to activate the ventricular myocardium
  • 3rd degree heart block – no conduction through AV node, and ventricular activation is due to an automatic subsidiary pacemaker focus (escape focus)