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ECG

ECG. Chapter 6 Atrioventricular Blocks. First-Degree AV Block – pg. 61.

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ECG

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  1. ECG Chapter 6 Atrioventricular Blocks

  2. First-Degree AV Block – pg. 61 • Delay in the conduction from the atria to the ventricles. With first degree blocks, every PR interval is >0.20 seconds or 5 boxes in length. Every “p” wave causes a “QRS” or every atria depolarization reaches the ventricles.

  3. So what is this?

  4. Second-Degree AV Block Type I (Mobitz Type I, or Wenckebach), pg. 62-63

  5. P to QRS Ratio • The ratio may remain constant or vary. • Pg. 62-63

  6. What’s This?

  7. Second-Degree AV Block Type II (Mobitz Type II) 3:1 2:1

  8. What is this?

  9. Third-Degree AV Block

  10. Third-Degree AV Block Idioventricular rhythm pacing the ventricles • Complete dissociation between the atria and ventricles or complete heart block. • Atria are depolarizing but not conducting to ventricles so another pacemaker must take over in the ventricles. • True 3rd degree heart block will have the atria rate > the ventricular rate. Junctional escape rhythm pacing the ventricles

  11. Complete dissociation between the atria and ventricles or complete heart block. • Atria are depolarizing but not conducting to ventricles so another pacemaker must take over in the ventricles. • True 3rd degree heart block will have the atria rate > the ventricular rate.

  12. AV Dissociation: Ventricular rate is faster than the arial rate. • Transient, non – lethal condition

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