(1 point). Listen.
A nurse is asked why myocardial ischemia is usually reversible within 20 minutes.
What is the nurse's best response?

The heart stores approximately 20 minutes' worth of oxygen supply in the myoglobin.

Collateral blood flow to the myocardium can maintain the myocardium for 20 minutes.

It takes 20 minutes for neutrophils and macrophages to arrive and activate inflammation.

Anaerobic metabolism maintains cellular integrity for approximately 20 minutes.

Answer and Explanation

The Correct Answer is B

Choice A rationale:

The nurse's best response is not choice A because the heart does not store 20 minutes' worth of oxygen supply in myoglobin. Myoglobin is a protein in muscles that stores oxygen, but it is not the primary source of oxygen for the heart.

Choice B rationale:

The nurse's best response is choice B. Collateral blood flow to the myocardium can maintain the myocardium for about 20 minutes during myocardial ischemia. Collateral blood vessels can provide an alternative source of blood supply to the heart muscle, which may temporarily sustain it in the absence of normal blood flow.

Choice C rationale:

Choice C is not the best response because the arrival of neutrophils and macrophages and the activation of inflammation are not the primary reasons for the reversibility of myocardial ischemia within 20 minutes.

Choice D rationale:

Anaerobic metabolism can maintain cellular integrity for a limited time, but it is not the primary reason for the reversibility of myocardial ischemia within 20 minutes. The best response is choice B, which focuses on collateral blood flow as the primary reason.

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Correct Answer is C

Explanation

Choice A rationale:

Prinzmetal angina is not caused by blood clots in the coronary artery. It is primarily due to vasospasm of the coronary arteries.

Choice B rationale:

Prinzmetal angina is not caused by hypoxemia from respiratory disease. It is a vascular issue, not a respiratory one.

Choice C rationale:

Prinzmetal angina is caused by vasospasm of the coronary arteries. This constriction reduces blood flow to the heart muscle, leading to chest pain.

Choice D rationale:

Prinzmetal angina is not caused by deep vein thrombosis or hypotension. It is primarily related to vasospasm in the coronary arteries.

A. Non-STEMI type heart attack. B. STEMI type heart attack. C. QRS type heart attack. D. Non-QRS type heart attack.

Correct Answer is B

Explanation

Choice A rationale:

Non-STEMI (Non-ST-Elevation Myocardial Infarction) is a type of heart attack where there is no significant ST segment elevation on the ECG. While it can be serious, it is generally associated with a lower risk of severe complications compared to STEMI.

Choice B rationale:

STEMI (ST-Elevation Myocardial Infarction) is a type of heart attack with significant ST segment elevation on the ECG. It is associated with a higher risk of severe complications and requires more urgent intervention. Patients with STEMI should be monitored most closely for complications.

Choice C rationale:

"QRS type heart attack" is not a recognized medical term. It does not accurately describe a type of heart attack. This choice is not appropriate.

Choice D rationale:

"Non-QRS type heart attack" is not a recognized term in the context of heart attacks. It does not accurately describe a specific type of heart attack. This choice is not suitable.

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(1 point). Listen.A nurse is asked why myocardial ischemia is usually reversible within 20 minutes.What is the nurse's best response?

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Naxlex Comprehensive Predictor Exams

(1 point). Listen.A nurse is asked what causes Prinzmetal angina.How should the nurse respond? Prinzmetal angina is caused by:.

Correct Answer is C

Explanation

(1 point). Listen.Which patient should be monitored most closely by the nurse for complications?

Correct Answer is B

Explanation

(1 point). Listen.If a person stands for long periods of time, causing blood to pool in superficial veins, which condition should the nurse assess for?

(1 point). Listen.Mitogens, such as angiotensin II, and growth factors stimulate:.

(1 point). Listen.A patient has left-sided (congestive) heart failure.Which assessment findings will indicate to the nurse that pulmonary edema has developed?

(1 point). Listen.A nurse is asked what causes infective endocarditis.What is the nurse's best answer?

(1 point). Listen.Which of the following principles should the nurse use to guide nursing care for a patient with restrictive cardiomyopathy? The myocardium is:.

(1 point). Listen.A patient has hyperhomocysteinemia and coronary artery disease (CAD). A nurse will label the hyperhomocysteinemia as a:.

(1 point). Listen.A nurse is assisting the primary care provider to determine if a patient had a myocardial infarction.Which laboratory values should the nurse check?

(1 point). Listen. When a nurse is describing the development of primary hypertension, which information is correct? Increased sympathetic nervous system (SNS) activity causes:

(1 point). Listen.
A nurse is asked why myocardial ischemia is usually reversible within 20 minutes.
What is the nurse's best response?