ecg chapter 6 atrioventricular blocks. first-degree av block – pg. 61 delay in the conduction from...
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![Page 1: 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,](https://reader036.vdocuments.net/reader036/viewer/2022070401/56649f1f5503460f94c37b7d/html5/thumbnails/1.jpg)
ECGChapter 6
Atrioventricular Blocks
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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.
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So what is this?
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Second-Degree AV Block Type I (Mobitz Type I, or Wenckebach), pg. 62-63
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P to QRS Ratio• The ratio may remain constant or vary. – Pg. 62-63
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What’s This?
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Second-Degree AV Block Type II (Mobitz Type II)
3:1
2:1
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What is this?
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Third-Degree AV Block
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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
![Page 13: 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,](https://reader036.vdocuments.net/reader036/viewer/2022070401/56649f1f5503460f94c37b7d/html5/thumbnails/13.jpg)
• 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.
![Page 14: 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,](https://reader036.vdocuments.net/reader036/viewer/2022070401/56649f1f5503460f94c37b7d/html5/thumbnails/14.jpg)
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AV Dissociation: Ventricular rate is faster than the arial rate. • Transient, non – lethal condition
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