ECG Chapter 6 Atrioventricular Blocks. First-Degree AV Block – pg. 61 Delay in the conduction from...
-
Upload
reynard-watson -
Category
Documents
-
view
213 -
download
0
Transcript of ECG Chapter 6 Atrioventricular Blocks. First-Degree AV Block – pg. 61 Delay in the conduction from...
ECGChapter 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
• 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.
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.
AV Dissociation: Ventricular rate is faster than the arial rate. • Transient, non – lethal condition