What class of antiarrhythmic drugs blocks potassium channels prolonging phase 3 of the action potential and slowing the rate and conduction of the heart?
I.
IV.
III.
II.
The Correct Answer is C
Choice A rationale
Class I antiarrhythmic drugs block sodium channels, affecting phase 0 of the action potential, not phase 3.
Choice B rationale
Class IV antiarrhythmic drugs block calcium channels, which affects phase 2 of the action potential and slows heart rate and conduction.
Choice C rationale
Class III antiarrhythmic drugs block potassium channels, prolonging phase 3 of the action potential. This results in a prolonged repolarization period, reducing the risk of arrhythmia.
Choice D rationale
Class II antiarrhythmic drugs are beta-blockers that primarily affect phase 4 of the action potential, reducing heart rate and conduction, but they do not block potassium channels.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A rationale
Monitoring the weekly pulse is not sufficient for managing ventricular arrhythmias at home. Continuous or daily monitoring of vital parameters is more effective.
Choice B rationale
Monitoring daily fluid intake is essential for overall health but not directly related to the management of ventricular arrhythmias with propranolol (Inderal).
Choice C rationale
Daily blood pressure monitoring is crucial for patients on propranolol, as this medication can significantly lower blood pressure, and tracking it helps prevent hypotension.
Choice D rationale
Weekly weight monitoring is important for patients with heart conditions, but daily monitoring of blood pressure is more directly related to the management of ventricular arrhythmias with propranolol.
Correct Answer is D
Explanation
Choice A rationale
Determining the type of pain is secondary to assessing pain severity.
Choice B rationale
Intravenous opioids are strong and should be considered only after evaluating pain severity.
Choice C rationale
Administering acetaminophen without assessing pain severity first is not appropriate.
Choice D rationale
Asking the patient to rate their pain helps gauge severity, guiding further pain management steps.
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