Which sequence best describes the direction of blood flow through the heart and lungs?

Vena cava → Right atrium → Right ventricle → Lungs → Pulmonary artery → Left atrium → Left ventricle.

Right atrium → Right ventricle → Pulmonary vein → Lungs → Pulmonary artery → Left atrium → Left ventricle.

Right atrium → Right ventricle → Pulmonary artery → Lungs → Pulmonary vein → Left atrium → Left ventricle.

Right atrium → Right ventricle → Lungs → Pulmonary vein → Pulmonary artery → Left atrium → Left ventricle → Vena cava.

Answer and Explanation

The Correct Answer is C

Choice A rationale
This sequence is incorrect because it suggests that blood goes from the lungs to the pulmonary artery, which is not accurate. The pulmonary artery carries deoxygenated blood from the heart to the lungs.
Choice B rationale
This sequence is incorrect because it suggests that blood goes from the pulmonary vein to the lungs, which is not accurate. The pulmonary vein carries oxygenated blood from the lungs to the heart.
Choice C rationale
This sequence correctly describes the direction of blood flow through the heart and lungs. Deoxygenated blood enters the right atrium, goes to the right ventricle, then is sent to the lungs via the pulmonary artery. After picking up oxygen in the lungs, the blood returns to the heart via the pulmonary vein, entering the left atrium, then the left ventricle, from where it is pumped out to the rest of the body.
Choice D rationale
This sequence is incorrect because it suggests that blood goes from the pulmonary vein to the pulmonary artery, which is not accurate. The pulmonary vein carries oxygenated blood from the lungs to the heart, and the pulmonary artery carries deoxygenated blood from the heart to the lungs.

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Correct Answer is C

Explanation

Choice A rationale
Adenosine (Adenocard) is a medication that can be used to treat supraventricular tachycardia, a type of abnormal heart rhythm. However, it is not typically used for atrial fibrillation.
Choice B rationale
Emergency cardioversion, where an electric shock is used to restore the heart’s normal rhythm, can be used in some cases of atrial fibrillation. However, if the atrial fibrillation has been present for more than 48 hours, there is a risk of blood clots, and anticoagulation for several weeks before the procedure may be needed.
Choice C rationale
Anticoagulant therapy is often used in patients with atrial fibrillation to reduce the risk of stroke. Atrial fibrillation can lead to blood pooling in the atria, increasing the risk of clot formation. These clots can then travel to the brain, causing a stroke.
Choice D rationale
Permanent pacemakers are sometimes used in atrial fibrillation to help regulate the heart’s rhythm. However, they are typically used when other treatments have failed or are contraindicated.

A. Adenosine B. Diltiazem C. Atropine D. Captopril

Correct Answer is B

Explanation

Choice A rationale: Adenosine Adenosine is a naturally occurring substance that relaxes and dilates blood vessels. It also affects the electrical activity of the heart. Adenosine is used to help restore normal heartbeats in people with certain heart rhythm disorders. However, it is not typically used for atrial fibrillation.

Choice B rationale: Diltiazem Diltiazem belongs to a class of medications called calcium-channel blockers. It works by relaxing the blood vessels so the heart does not have to pump as hard. Diltiazem also increases the supply of blood and oxygen to the heart. It is used in adults alone or in combination with other medications to treat hypertension (high blood pressure) or symptoms of angina (chest pain). Diltiazem injection is used in adults to treat certain heart rhythm disorders such as atrial fibrillation.

Choice C rationale: Atropine Atropine is a tropane alkaloid and anticholinergic medication used to treat certain types of nerve agent and pesticide poisonings as well as some types of slow heart rate, and to decrease saliva production during surgery. However, it is not typically used for atrial fibrillation.

Choice D rationale: Captopril Captopril is used in adults alone or in combination with other medications to treat high blood pressure (hypertension) and congestive heart failure.
Captopril is also used to improve survival and reduce the risk of heart failure after a heart attack in patients with a heart condition called left ventricular hypertrophy (enlargement of the walls of the left side of the heart)4. However, it is not typically used for atrial fibrillation.

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Which sequence best describes the direction of blood flow through the heart and lungs?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

A patient with dilated cardiomyopathy has recently developed atrial fibrillation that has been unresponsive to drug therapy for several days. What topic should the nurse plan to include in patient teaching?

Correct Answer is C

Explanation

The nurse is providing care for a patient with the following tracing on the electrocardiogram (ECG) for atrial fibrillation. What prescription should the nurse anticipate from the primary healthcare provider (PHCP)?

Correct Answer is B

Explanation

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