Which of the following demonstrates the pathophysiological process occurring in atelectasis?
Overinflated alveoli leading to air trapping.
Collapse of alveoli impairing ventilation and perfusion.
Activation of the inflammatory response and inflammation of the bronchi.
Activation of the inflammatory response and congestion in the alveoli.
The Correct Answer is B
Choice A reason: Overinflated alveoli and air trapping occur in emphysema or COPD, not atelectasis. Atelectasis involves alveolar collapse, reducing lung volume and gas exchange, not overinflation, making this choice incorrect for the pathophysiology of atelectasis.
Choice B reason: Atelectasis is the collapse of alveoli, often due to obstruction, compression, or surfactant deficiency, impairing ventilation and perfusion. This reduces gas exchange, causing hypoxia, and matches the pathophysiological process, making this the correct choice for atelectasis.
Choice C reason: Inflammation of the bronchi (bronchitis) involves airway inflammation, not alveolar collapse. Atelectasis results from physical collapse of alveoli, not primarily inflammatory processes, making this choice incorrect for atelectasis’s pathophysiology.
Choice D reason: Inflammatory congestion in alveoli describes pneumonia or pulmonary edema, not atelectasis. Atelectasis involves alveolar collapse, reducing ventilation without primary inflammation or fluid accumulation, making this choice incorrect for the described process.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A reason: Addison’s disease causes adrenal insufficiency, reducing aldosterone, leading to sodium loss and decreased blood volume, causing hypotension. This is a hallmark symptom due to impaired vascular tone, making this the correct choice.
Choice B reason: Hyperglycemia is not typical in Addison’s disease. Cortisol deficiency may cause hypoglycemia due to reduced gluconeogenesis, not elevated glucose, making this choice incorrect for Addison’s manifestations.
Choice C reason: Weight gain is not associated with Addison’s disease, which causes weight loss due to reduced cortisol, leading to decreased appetite and metabolism. This makes the choice incorrect.
Choice D reason: Hypernatremia does not occur in Addison’s disease. Aldosterone deficiency causes sodium loss, leading to hyponatremia, not elevated sodium, making this choice incorrect for Addison’s disease.
Correct Answer is ["A","B","D"]
Explanation
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.
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