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heart block that is not really a block
1st degree
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What defines a 1st degree HB?
A PRI greater that .20
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Describe the following for 1st degree HB?
regularity, HR, P waves, PRI, QRS
- reg: usuall reg or irregular
- HR: varies
- P waves: upright, consistent
- PRI: >.20
- QRS: .12, regular
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What defines a type 2, 2nd degree HB?
- More Ps than QRS*
- ONLY TRUE HB with a consistent PRI***
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Describe the following for 2nd degree, type 2 HB?
regularity, HR, P waves, PRI, QRS
- reg: reg or irreg
- rate: varies, but usually low
- P waves: uniform, upright. ALWAYS more P waves than QRS's
- PRI:ONLY TRUE HB with a consistent PRI***
- QRS: <.12
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What defines a 2nd degree type 1 HB?
PRI is lengthening then resets***
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Describe the following for 3rd degree HB?
regularity, HR, P waves, PRI, QRS
- Reg: regular usually
- PRI: changing all over
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Defining characteristic of 3rd degree HB? why?
PRI is all over the place because atrium and ventricles each pace themselves separately***
more P waves than QRS**
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What 2 true HB have more Ps than QRS always
- 2nd degree type 2
- 3rd degree
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What defines a ventricular rhythm? why?
- typically wide QRS. greater than .12
- no fail safe after ventricular rhythms
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What defines PVC? What is it due to?
-ventricular irritability
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