The nurse understands that which of the following medications is a potassium channel blocker?

Amiodarone

Digoxin

Verapamil

Carvedilol

Answer and Explanation

The Correct Answer is A

A. Amiodarone: Amiodarone is a Class III antiarrhythmic that primarily works by blocking potassium channels, thereby prolonging repolarization and the action potential duration. It is used to manage various atrial and ventricular arrhythmias, including atrial fibrillation and ventricular tachycardia.

B. Digoxin: Digoxin is a cardiac glycoside that increases myocardial contractility and slows conduction through the AV node. It does not affect potassium channels directly but rather works by inhibiting the sodium-potassium ATPase pump.

C. Verapamil: Verapamil is a calcium channel blocker (Class IV antiarrhythmic) that slows conduction through the AV node and is used to treat supraventricular tachyarrhythmias and hypertension. It has no significant effect on potassium channels.

D. Carvedilol: Carvedilol is a non-selective beta-blocker with some alpha-blocking effects. It reduces heart rate and blood pressure but does not block potassium channels or have antiarrhythmic properties in that classification.

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Correct Answer is D

Explanation

A. Presence of fine tremors: Fine tremors are not a typical sign of worsening heart failure. They may be associated with medications (like bronchodilators or lithium), metabolic issues, or neurologic disorders, but not directly with heart failure decompensation.

B. Heart rate 50 per minute: Bradycardia may be notable, especially in the context of beta-blocker therapy, but a heart rate of 50 bpm in a stable patient is not necessarily a sign of worsening heart failure unless accompanied by symptoms like dizziness or hypotension.

C. +1 peripheral edema: Mild peripheral edema is often chronic and common in older adults with heart failure. It does not reliably indicate worsening status unless there is a significant increase in edema or associated weight gain and pulmonary symptoms.

D. Increased confusion: Older adults are more susceptible to changes in cognitive function due to decreased cardiac output in worsening heart failure. New or worsening confusion in older adults is a key sign of decreased cerebral perfusion and may signal worsening heart failure. It can also indicate hypoxia or electrolyte imbalance, making it a critical finding that warrants immediate evaluation.

A. Edema of ankles B. Shortness of breath C. Fatigue after exercise D. Abdominal fullness

Correct Answer is B

Explanation

A. Edema of ankles: While peripheral edema may be associated with worsening cardiac function or side effects from other medications, it is not a hallmark adverse effect of amiodarone. It warrants evaluation but is not the most urgent symptom related to this drug.

B. Shortness of breath: Amiodarone is a potent antiarrhythmic medication with several potential serious side effects, including pulmonary toxicity. This can manifest as interstitial pneumonitis or pulmonary fibrosis, which may present as new or worsening shortness of breath cough, and chest pain. This is a potentially life-threatening complication and requires immediate medical attention.

C. Fatigue after exercise: Exercise-induced fatigue can result from many conditions, including heart disease or deconditioning, but it is a nonspecific symptom. It does not point directly to a serious adverse reaction from amiodarone.

D. Abdominal fullness: Abdominal fullness is not typically associated with amiodarone. It may relate to gastrointestinal or hepatic issues, but it is not as immediately concerning as respiratory symptoms suggestive of pulmonary toxicity.

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The nurse understands that which of the following medications is a potassium channel blocker?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

Which clinical manifestation would the nurse use to indicate that the status of an older adult patient (greater than age 75) with chronic heart failure condition is worsening?

Correct Answer is D

Explanation

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Correct Answer is B

Explanation

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