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11 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Bradyarrythmias imply slower conduction at which two locations?
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SA node (decreased firing rate)
AV node (decreased conductance) |
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How do anticholinergics treat bradyarrythmias?
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Block effect (high tone) of vagus nerve, which slows conduction
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How do sympathomimetics treat bradyarrythmias?
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Directly stimulate B receptors at the sinus node
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What two drugs (and class) treat bradyarrythmia primarily associated with increased vagal tone?
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Atropine, Glycopyrolate (anticholinergics)
NB: sympathomimetics may also treat high vagal tone secondarily |
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What three drugs (and class) treat bradyarrythmia primarily associated with SA or AV node disease?
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Isoproterenol, Terbuteline, Theophyline (sympathomimetics)
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What are the three types of tachyarrhythmias?
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-Sinus tachycardia
-Supraventricular tachycardia -Ventricular tachycardia |
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How is sinus tachycardia treated?
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It isn't. (Underlying causes must be treated.)
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How is supraventricular tachycardia treated?
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Conduction through the AV node must be slowed. Drugs of choice are B blockers, calcium channel blockers, or Digoxin.
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Treatment: Beta blockers (Atenolol), channel calcium blockers (Diltiazem), Digoxin (best choice if decreased contractility)
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Supraventricular tachycardia (fibrillation)
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Treatment: positive inotropes
-Dobutamine (IV, emergency) -Digoxin (PO, primarily an antiarrhythmic) -Pimobendan (PO, safe, also vasodilator associated with increased survival) |
Decreased contractility (e.g. DCM)
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Treatment of choice for heart failure:
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ACE inhibitor + diuretic!
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