What is the primary cause of myocardial ischemia?
Idiopathic vasospasm.
Atherosclerosis.
Venous emboli.
Arterial emboli from a heart valve.
The Correct Answer is B
Choice A rationale
Idiopathic vasospasm, or spontaneous constriction of the blood vessels, can cause myocardial ischemia. However, this is a relatively rare cause compared to atherosclerosis.
Choice B rationale
Atherosclerosis, a condition characterized by the buildup of fatty plaques in the arteries, is the most common cause of myocardial ischemia. These plaques can restrict blood flow to the heart muscle, leading to ischemia.
Choice C rationale
Venous emboli, or blood clots that form in the veins, typically do not cause myocardial ischemia. These clots are more likely to cause problems in the lungs (pulmonary embolism) if they travel through the bloodstream.
Choice D rationale
Arterial emboli from a heart valve can cause myocardial ischemia, but this is less common than atherosclerosis. These emboli, or blood clots, can block blood flow to the heart muscle if they travel through the bloodstream.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
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.
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.
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