ch 11 av blocks
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The ECG Course
Adam Thompson, EMT-‐P, BAS
Chapter 11 AV Blocks
AV Blocks
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)
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)
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)
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
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?
AV Blocks
AV Blocks
AV Blocks
AV Blocks
AV Blocks
AV Blocks
AV Blocks
AV Blocks
AV Blocks
AV Blocks
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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