Which of the following has a slow depolarizing pha

ATI LPN

ATI LPN Test Bank

Which of the following has a slow depolarizing phase?

A. SA node B. Atrial muscle cell C. Bundle of His D. Purkinje fibers

Correct Answer: A

Rationale: The SA node has a slow depolarizing phase due to slow calcium influx, unlike the rapid sodium-driven depolarization elsewhere.

Which one of the following causes noninfectious myocarditis?

A. Coxsackie B B. HIV C. Vasculitis D. Corynebacterium diphtheria

Correct Answer: C

Rationale: Vasculitis causes noninfectious myocarditis, unlike the infectious agents listed.

Which of the following is considered as a cardiovascular complication due to hypertension?

A. Benign nephrosclerosis B. Hypertensive retinopathy C. Psychogenic D. Coarctation of the aorta

Correct Answer: B

Rationale: Hypertensive retinopathy is a direct cardiovascular complication of hypertension.

Which of the following drugs act by blocking Na/K ATPase thus increasing cardiac muscle contractility?

A. Dobutamine B. Milrinone C. Digoxin D. Hydralazine

Correct Answer: C

Rationale: Digoxin inhibits Na/K ATPase, increasing intracellular calcium and contractility.

Which of the following medication would be safe to use in a patient taking ranolazine?

A. Carbamazepine B. Clarithromycin C. Enalapril D. Quetiapine

Correct Answer: C

Rationale: Enalapril is safe with ranolazine, unlike the others which affect CYP3A4 metabolism.

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