In what ways can a myocardial infarction develop? (Select all that apply)
A coronary artery vasospasm occurs causing reduced blood flow.
A thrombus builds up and obstructs the blood flow to the heart.
A traumatic injury to the chest results in bruising of the chest wall.
An embolus travels and blocks perfusion through the coronary arteries.
A systemic infection occurs which causes significant hyperthermia.
Correct Answer : A,B,D
Choice A reason: Coronary artery vasospasm causes transient vessel constriction, reducing blood flow to the myocardium, leading to ischemia and potentially infarction. This is a recognized cause, particularly in variant angina, making this a correct mechanism for myocardial infarction.
Choice B reason: A thrombus forming in a coronary artery, often due to plaque rupture, obstructs blood flow, causing myocardial ischemia and infarction. This is the most common cause of myocardial infarction, making this a correct mechanism.
Choice C reason: Chest wall bruising from trauma does not directly cause myocardial infarction, which requires coronary artery occlusion. Trauma may cause cardiac contusion but not infarction, making this choice incorrect for myocardial infarction development.
Choice D reason: An embolus, such as from a clot elsewhere, can block a coronary artery, stopping blood flow to the myocardium, causing infarction. Though less common than thrombosis, it is a valid mechanism, making this a correct choice.
Choice E reason: Systemic infection with hyperthermia does not directly cause myocardial infarction. It may increase cardiac demand, potentially exacerbating ischemia, but infarction requires coronary occlusion, not just fever, making this choice incorrect.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A reason: Taking pain medications manages symptoms of a sickling crisis but does not prevent it. Sickle cell crises occur due to hemoglobin S polymerization, triggered by hypoxia or dehydration, not directly prevented by analgesics, making this choice incorrect for prevention.
Choice B reason: Avoiding high altitudes reduces hypoxia, a trigger for sickling crises, as low oxygen levels promote hemoglobin S polymerization. While helpful, dehydration is a more significant and common trigger, making this choice less critical than avoiding dehydration.
Choice C reason: A high-protein, high-fat diet does not directly prevent sickling crises. Nutritional balance supports overall health, but sickle cell crises are triggered by dehydration, hypoxia, or infection, not dietary composition, making this choice incorrect for crisis prevention.
Choice D reason: Avoiding dehydration is critical in sickle cell anemia, as low fluid levels increase blood viscosity, promoting hemoglobin S polymerization and red cell sickling. This triggers vaso-occlusive crises, so maintaining hydration prevents these events, making this the correct choice.
Correct Answer is D
Explanation
Choice A reason: Hypoparathyroidism causes hypocalcemia due to low parathyroid hormone, reducing bone resorption and calcium absorption. Hypercalcemia requires increased calcium mobilization, which hypoparathyroidism prevents, making this choice incorrect for a person at risk of hypercalcemia.
Choice B reason: Chronic renal failure typically causes hypocalcemia due to impaired vitamin D activation and phosphate retention, binding calcium. Hypercalcemia is rare unless overtreated with calcium supplements, making this choice incorrect for typical renal failure scenarios.
Choice C reason: Low plasma albumin reduces bound calcium, lowering total serum calcium, not causing hypercalcemia. Free calcium may remain normal, but total calcium decreases, making this choice incorrect for a person at risk of hypercalcemia.
Choice D reason: Bedbound, immobile individuals are at risk for hypercalcemia due to increased bone resorption from lack of weight-bearing activity. Osteoclasts break down bone, releasing calcium into the blood, causing hypercalcemia, making this the correct choice.
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