ch 11 av blocks
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The ECG Course
Adam Thompson, EMT-‐P, BAS
Chapter 11 AV Blocks
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AV Blocks
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1st Degree AVB
• Rate: Iden?fy underlying rate • Rhythm: Regular • P wave: Present • P:QRS ra?o: 1 to 1 • PR-‐interval: > 200 ms (0.20 sec) • QRS Width: < 120 ms (0.12 sec)
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2nd Degree Type I AVB���Mobitz I orWenkebach
• Rate: Iden?fy underlying rate • Rhythm: Regularly-‐Irregular • P wave: Present • P:QRS ra?o: Variable • PR-‐interval: Variable (going, going, gone…) • QRS Width: < 120 ms (0.12 sec)
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2nd Degree Type II AVB���aka Mobitz II
• Rate: Iden?fy underlying rate • Rhythm: Regularly-‐Irregular • P wave: Present • P:QRS ra?o: x:x -‐ 1 • PR-‐interval: Normal *Dropped QRS • QRS Width: < 120 ms (0.12 sec)
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3rd Degree AVB���Complete Heart Block
• Rate: Atrial & Ventricular rates differ • Rhythm: Regular • P wave: Present • P:QRS ra?o: Variable • PR-‐interval: No paXern • QRS Width: Normal or WIDE
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AV Blocks
Yes2nd Degree Type II
No1st Degree
YesDropped QRS?
Yes2nd Degree Type I
No3rd Degree
NoP-wave for every QRS?
Is the PR-interval a constant length?
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AV Blocks
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AV Blocks
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AV Blocks
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AV Blocks
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AV Blocks
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AV Blocks
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AV Blocks
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AV Blocks
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AV Blocks
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AV Blocks
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AV Blocks
Yes2nd Degree Type II
No1st Degree
YesDropped QRS?
Yes2nd Degree Type I
No3rd Degree
NoP-wave for every QRS?
Is the PR-interval a constant length?