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19 Cards in this Set
- Front
- Back
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cardiogenic beta adrenergic blockers are less likely to cause
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bronchoconstriction
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a group of pharmaceuticals that are used to suppress fast rhythms of the heart
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Antiarrhythmic agents
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The class I antiarrhythmic agents interfere with the
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sodium channel
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The diastolic membrane potential may be increased by
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adenosine and acetylcholine
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The slope of phase 4 depolarization may be decreased by
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beta receptor blockers
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The duration of the action potential may be prolonged by drugs that block cardiac
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K+ channels
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The membrane threshold potential may be altered by drugs that block
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Na+ or Ca2+ channels
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Drugs that prolong nodal refractoriness and slow conduction include:
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Ca2+ channel blockers, beta-adrenergic blockers, or digitalis glycosides
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sodium channel blockers include
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lidocaine, quinidine, and tocainide
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Sodium channel blockade results in
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an increased threshold
decreased automaticity |
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Quinidine is used to manage nearly every form of arrhythmia especially acute and chronic
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supraventricular dysrhythmias
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Approximately 20% of patients with atrial fibrillation will convert to normal sinus rhythm following ______treatment
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quinidine
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Vagotonic effects on digitalis prevents this paradoxical increase by increasing _____at AV node
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vagal tone
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Quinidine Side Effects
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hypotension
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the use of antiarrhythmic agents to suppress
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atrial arrhythmias (atrial fibrillation and atrial flutter
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Class II agents are conventional beta blockers. They act by blocking the effects of catecholamines at the β1-adrenergic receptors
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decrease conduction through the AV node
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Class II agents include
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atenolol, esmolol, propranolol, and metoprolol
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Class III agents predominantly block the ______, thereby prolonging repolarization
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potassium channels
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Class IV agents are slow
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calcium channel blockers
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