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A nurse is reviewing cardiac rhythms and heart blocks for a critical care course. The nurse is aware that which of the following describes first degree heart block?

The PR interval gets longer then drops.

PR interval greater than 0.20 seconds in duration

There are absent P waves

R-R is irregular

Answer and Explanation

The Correct Answer is B

Rationale:

A. This describes a second-degree heart block, specifically Mobitz Type I (Wenckebach).

B. A PR interval greater than 0.20 seconds is characteristic of first-degree heart block.

C. This describes third-degree heart block, also known as complete heart block.

D. An irregular R-R interval is not specific to first-degree heart block.

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Correct Answer is D

Explanation

Rationale:

A. Hypertensive crisis is not a common complication of atrial fibrillation.

B. Cardiogenic shock is not a common complication of atrial fibrillation.

C. Flash pulmonary edema is not a common complication of atrial fibrillation.

D. Atrial fibrillation can lead to the formation of blood clots in the atria, which can then travel to the brain and cause a stroke or embolic cerebral vascular accident.

A. Alteplase (fibrinolytics) B. IV Nitroglycerine C. Metoprolol (beta blockers) D. IV Heparin

Correct Answer is B

Explanation

Rationale:

A. Alteplase (fibrinolytics) is used to dissolve clots in coronary arteries during an acute myocardial infarction (AMI).

B. IV Nitroglycerine is a vasodilator that dilates coronary blood vessels, increasing blood flow to the myocardium.

C. Metoprolol (beta blockers) are used to decrease heart rate, blood pressure, and myocardial oxygen demand.

D. IV Heparin is used to prevent further clot formation in coronary arteries during an acute myocardial infarction (AMI).

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A nurse is reviewing cardiac rhythms and heart blocks for a critical care course. The nurse is aware that which of the following describes first degree heart block?

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