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ECG Chapter 6 Atrioventricular Blocks 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. So what is this? Second-Degree AV Block Type I (Mobitz Type I, or Wenckebach), pg. 62-63 P to QRS Ratio • The ratio may remain constant or vary. – Pg. 62-63 What’s This? Second-Degree AV Block Type II (Mobitz Type II) 3:1 2:1 What is this? Third-Degree AV Block Third-Degree AV Block Idioventricular rhythm pacing the ventricles Junctional escape 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. • 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. AV Dissociation: Ventricular rate is faster than the arial rate. • Transient, non – lethal condition
