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19 Cards in this Set
- Front
- Back
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define bradycardia
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<60 bpm
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Causes of sinus bradycardia
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high vagal tone
ischemia degenerative disease drugs hypothyroidism |
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Tx of sinus bradycardia
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nothing unless symptomatic (then pacemaker)
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Cause of sinus pause
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degenerative disease
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Tx of sinus pause
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pacemaker if symptomatic (syncope if >3sec)
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General results of tachy-brady syndrome
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pauses at termination of tachyarrhythmias (AF) due to overdrive suppression of Sinus node
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What is going on with junctional escape rhythm?
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AV node is the main pacemaker (lack of P wave)
slower b/c of slower phase 4 depolarization |
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General description of primary heart block
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every P makes a QRS, but with a longer PR
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General description of secondary heart block
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Regular P waves, but only some make QRS waves
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General description of tertiary heart block
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no P conducts to a QRS (complete disconnect)
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Causes of 1st degree AV block
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high vagal tone
degenerative disease drugs |
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Tx of 1st degree AV block
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nothing
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General identifiers of Mobitz I v. Mobitz II
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M-I has variable refractoriness
PR is long/prolongs block is in AV node QRS duration varies |
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Causes of Mobitz I
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AV nodal blocking drugs
inferior MI vagal tone degenerative disease |
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Causes of Mobitz II
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Na channel blocking
drugs anterior MI degenerative disease |
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Effect of carotid massage on Mobitz I?
Effect of exercise/atropine? |
Carotid massage worsens it; exercise improves it.
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Tx for Mobitz II
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pacemaker
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Tx of 3rd degree AV block
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pacemaker or reverse w/ tx of underlying cause
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Causes of 3rd degree AV block
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ischemia/infarct
degenerative disease |
