Nursing Elites

1. Which type of medication is used to reduce the workload on the heart by slowing down the heart rate and lowering blood pressure?

• A. Beta-blocker
• B. ACE inhibitor
• C. Calcium channel blocker
• D. Diuretic

Correct answer: A

Rationale: The correct answer is A: Beta-blocker. Beta-blockers are medications that reduce the workload on the heart by slowing down the heart rate and lowering blood pressure. They are commonly used in the treatment of heart conditions such as hypertension and heart failure. ACE inhibitors (B) work by dilating blood vessels to reduce blood pressure, calcium channel blockers (C) prevent calcium from entering the heart muscle and blood vessel walls, and diuretics (D) help the body get rid of excess salt and water by increasing urine production.

2. Which valve prevents backflow of blood into the left ventricle from the aorta?

• A. Aortic valve
• B. Mitral valve
• C. Tricuspid valve
• D. Pulmonary valve

Correct answer: A

Rationale: The correct answer is Aortic valve. The aortic valve is positioned between the left ventricle and the aorta. It prevents blood from flowing back into the left ventricle after it has been pumped into the aorta. The mitral valve (Choice B) is located between the left atrium and the left ventricle, the tricuspid valve (Choice C) is between the right atrium and right ventricle, and the pulmonary valve (Choice D) is situated between the right ventricle and the pulmonary artery. Therefore, they are not responsible for preventing backflow from the aorta into the left ventricle.

3. The nurse is caring for a client on warfarin with an INR of 5.2. What is the most appropriate action?

• A. Administer vitamin K as an antidote.
• B. Hold the next dose of warfarin.
• C. Increase the dose of warfarin.
• D. Monitor the client’s INR closely.

Correct answer: A

Rationale: An INR of 5.2 is elevated, indicating an increased risk of bleeding. Administering vitamin K can help reverse the effects of warfarin, which is the most appropriate action in this situation. Holding the next dose of warfarin is not enough to address the high INR, and increasing the dose would further elevate the INR level. Monitoring the INR closely is important, but in this case, immediate action is needed to counteract the anticoagulant effects of warfarin.

4. What is this surgical procedure that restores blood flow to the heart by diverting blood around a blocked artery?

• A. Coronary artery bypass graft (CABG)
• B. Angioplasty
• C. Stent placement
• D. Valve replacement

Correct answer: A

Rationale: The correct answer is A, Coronary artery bypass graft (CABG), which is a surgical procedure to improve blood flow to the heart by redirecting blood around blocked or narrowed arteries. This procedure is specifically designed to bypass blocked coronary arteries, allowing blood to flow more freely to the heart muscle. Choices B, C, and D are incorrect because angioplasty involves opening up narrowed or blocked blood vessels, stent placement involves inserting a mesh tube to keep arteries open, and valve replacement involves replacing a damaged heart valve - none of which directly address diverting blood flow around a blocked artery.

5. What is the term for the amount of blood ejected by the left ventricle into the aorta per beat, determined by preload, contractility, and afterload?

• A. Stroke volume
• B. Cardiac output
• C. End-diastolic volume
• D. Ejection fraction

Correct answer: A

Rationale: The correct answer is A: Stroke volume. Stroke volume refers to the volume of blood ejected by the left ventricle during each heartbeat. This is determined by preload (the degree of stretch of the cardiac muscle fibers at the end of diastole), contractility (the force of myocardial contraction), and afterload (the pressure or resistance that the ventricle must overcome to eject blood). Choice B, Cardiac output, is the volume of blood pumped by the heart per minute and is calculated by multiplying the heart rate by the stroke volume. Choice C, End-diastolic volume, is the volume of blood in the ventricle at the end of diastole before contraction. Choice D, Ejection fraction, is the proportion of blood pumped out of the ventricle with each contraction, calculated by dividing the stroke volume by the end-diastolic volume.

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