Which disorder is characterized by a group of symptoms produced by an excess of free circulating cortisol from the adrenal cortex?
Addison disease
Hashimoto disease
Cushing syndrome
Graves disease
The Correct Answer is C
Reasoning:
Choice A reason: Addison disease results from adrenal insufficiency, causing deficient cortisol and aldosterone production. This leads to symptoms like hypotension, hyponatremia, and hyperkalemia, opposite to the cortisol excess seen in Cushing syndrome, which involves weight gain, hypertension, and hyperglycemia due to elevated adrenal cortex activity.
Choice B reason: Hashimoto disease is an autoimmune thyroiditis causing hypothyroidism, with low thyroid hormone levels leading to fatigue, weight gain, and cold intolerance. It does not involve adrenal cortex cortisol excess, unlike Cushing syndrome, which is characterized by hypercortisolism and distinct metabolic and physical symptoms.
Choice C reason: Cushing syndrome is defined by excess free circulating cortisol from the adrenal cortex, due to pituitary tumors, adrenal hyperplasia, or exogenous steroids. This causes weight gain, moon face, hypertension, and hyperglycemia, reflecting cortisol’s effects on metabolism, fat distribution, and fluid balance, making it the correct disorder.
Choice D reason: Graves disease is an autoimmune condition causing hyperthyroidism, with excess thyroid hormone leading to weight loss, tachycardia, and heat intolerance. It does not involve adrenal cortex cortisol production, unlike Cushing syndrome, which is specifically related to hypercortisolism and its systemic metabolic effects.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Reasoning:
Choice A reason: Aspiration precautions are important in head injury to prevent pneumonia, particularly if consciousness is impaired, but they are not specific seizure prophylactic measures. Seizures require anticonvulsants to prevent neuronal hyperexcitability, making aspiration precautions a secondary concern unrelated to seizure prevention.
Choice B reason: Anticonvulsant medications, initiated early (e.g., day two), are standard for seizure prophylaxis in head injury. Trauma can cause cortical irritation, increasing seizure risk. Drugs like levetiracetam stabilize neuronal activity, preventing seizures, which could worsen brain injury or ICP, making this the primary measure.
Choice C reason: Intubation and ventilator support are used for severe head injuries with compromised airway or breathing but are not seizure prophylaxis. Seizures are managed with anticonvulsants, as mechanical ventilation does not address neuronal excitability, making this inappropriate for seizure prevention.
Choice D reason: Antiemetic medications manage nausea but are not seizure prophylactic measures. While vomiting may occur post-head injury, it does not prevent seizures, which result from cortical irritability. Anticonvulsants directly target seizure risk, making antiemetics irrelevant to this specific intervention goal.
Correct Answer is D
Explanation
Reasoning:
Choice A reason: Continuous oxygen therapy is not a standard preventive measure for sickle cell crises. Oxygen is used during acute crises to treat hypoxia from vaso-occlusion, but daily hydration is more effective for prevention, as it reduces blood viscosity and sickling, making this inappropriate.
Choice B reason: Avoiding all sports is overly restrictive for sickle cell anemia. Moderate exercise can be safe with proper hydration and rest. Complete avoidance does not directly prevent crises and may reduce quality of life, whereas hydration directly addresses the risk of sickling and vaso-occlusion.
Choice C reason: Avoiding activities causing shortness of breath is partially correct, as overexertion can trigger hypoxia and crises. However, it is less specific than hydration, which directly reduces blood viscosity and sickling, preventing crises more effectively across various situations, not just during exertion.
Choice D reason: Drinking at least 8 glasses of water daily is critical in sickle cell anemia to prevent crises. Adequate hydration reduces blood viscosity, preventing red blood cell sickling and vaso-occlusion. Dehydration increases sickling risk, making consistent fluid intake a key preventive strategy for this client.
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