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15 Cards in this Set
- Front
- Back
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how do you determine whether QRS is widened or not?
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- QRS cannot be any bigger than 3 small squares
- greater than 120ms |
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what happens to QRS in BBB?
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- widened QRS (>3 squares)
- aka greater than 120ms |
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what is EKG evidence of an old MI?
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- pathological Q waves
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what is a 1st degree AV block?
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- NOT A BLOCK!
- delay in conduction represented by PR interval >200ms (5 small squares) - usually at level of AV node |
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what is a Mobitz I 2nd degree AV block?
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- short P wave --> longer P wave --> fails to conduct
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what is a Mobitz II 2nd degree AV block?
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- P wave is one time, widened QRS
- can progress suddenly to AV block unlike Mobitz I |
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why is Mobitz II worse than Mobitz I?
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- Mobitz II block is too low so ventricles cannot provide autorhythmicity
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what is a 3rd degree AV block?
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- complete AV block
- no relationship b/w p waves & QRS - no conduction from atria to ventricles, narrow QRS, block occurred at level of AV node - below AV node no reliable escape |
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what is the QRS pattern of a bundle branch block?
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- QRS wide
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how do you tell the difference between a supraventricular & ventricular arrythmia?
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- supraventricular - if p wave precedes premature beat
- ventricular - QRS wide w/ no p wave |
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what are 3 supraventricular tachyarrhythmias?
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1) a fib
2) a flutter 3) paroxysmal supraventricular tachycardia |
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what is atrial flutter?
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- Regular ventricular rhythm
- “Saw tooth” patterned atrial activity - No electrical baseline |
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what is atrial fibrillation?
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- Irregularly irregular rhythm
- Irregular baseline with variable amplitude & morphology |
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what is paroxysmal supraventricular tachycardia?
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- Regular tachycardia
- Sudden onset/offset - P waves hidden in QRS |
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what are 3 ventricular tachyarrhythmias?
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1) monomorphic ventricular tachycardia
2) polymorphic ventricular tachycardia 3) ventricular fibrillation |
