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 C

Explanation

A. Administer amiodarone 200 mg IV push: Amiodarone is used for shockable rhythms like ventricular fibrillation (VF) or pulseless ventricular tachycardia (VT) that are refractory to defibrillation. The rhythm on the monitor is asystole, which is non-shockable, and amiodarone is not indicated here.

B. Defibrillate the client using 200 joules: Defibrillation is only appropriate for shockable rhythms such as VF or pulseless VT. Asystole is not shockable, and defibrillation in this rhythm would be ineffective and inappropriate.

C. CPR until the physician stops the code: The rhythm strip shows asystole, a flatline with no electrical activity. The priority intervention is to initiate and continue high-quality cardiopulmonary resuscitation (CPR) immediately and continue until the code is terminated by the physician. This is consistent with Advanced Cardiac Life Support (ACLS) guidelines.

D. Administer adenosine 12 mg IV push: Adenosine is used to terminate supraventricular tachycardia (SVT) and is not indicated in asystole or during cardiac arrest. It would have no effect in a rhythm with no electrical activity.

A. Narrowed pulse pressure B. Sinus tachycardia C. Apical diastolic murmur D. S3 heart sound

Correct Answer is A

Explanation

A. Narrowed pulse pressure: Aortic stenosis leads to obstruction of blood flow from the left ventricle to the aorta during systole, reducing systolic pressure while diastolic pressure remains unchanged or slightly elevated. This results in a narrowed pulse pressure, a classic finding in moderate to severe aortic stenosis.

B. Sinus tachycardia: While tachycardia can occur in response to decreased cardiac output or stress, it is not a defining feature of aortic stenosis. The hallmark findings relate more directly to fixed cardiac output and valve obstruction.

C. Apical diastolic murmur: Aortic stenosis produces a systolic ejection murmur, best heard at the right second intercostal space and radiating to the carotids. An apical diastolic murmur would suggest mitral stenosis or other diastolic valve pathology.

D. S3 heart sound: An S3 is more indicative of volume overload and heart failure rather than valvular stenosis. While advanced aortic stenosis can lead to heart failure, the S3 is not a primary or early manifestation of this condition.

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WBC	8.5
Hemoglobin	17g/dL
Hematocrit	54%
BUN	28mg/dL
Creatinine	1.1 mg/dL
Potassium	4.9 mEq/L

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

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Naxlex Comprehensive Predictor Exams

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Explanation

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Correct Answer is A

Explanation

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