A patient has recently been diagnosed with multiple sclerosis. Which response best explains the etiology of multiple sclerosis (MS)?

The disease is prevalent in certain geographical locations.

There is a well-defined genetic cause.

Inflammatory processes are responsible for the signs and symptoms.

Ischemic lesions in the brain are responsible for the signs and symptoms.

Answer and Explanation

The Correct Answer is C

A. The disease is prevalent in certain geographical locations: This statement is true but does not explain the etiology of MS. Geographic prevalence does not address the underlying cause.

B. There is a well-defined genetic cause: While genetics may play a role in MS, there is no single well-defined genetic cause for the disease.

C. Inflammatory processes are responsible for the signs and symptoms: MS is an autoimmune disease characterized by inflammation and demyelination of the central nervous system, leading to the signs and symptoms of the disease.

D. Ischemic lesions in the brain are responsible for the signs and symptoms: MS is primarily caused by demyelination rather than ischemic lesions.

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Correct Answer is D

Explanation

A. Several episodes of black and tarry stools: This indicates melena, which is typically associated with upper gastrointestinal bleeding, not specifically Crohn's disease.

B. Several episodes of hematochezia per day: Hematochezia (fresh blood in stools) can occur in Crohn's disease due to inflammation and ulceration in the intestines.

C. Post-alcohol ingestion epigastric pain: This is more commonly associated with gastritis or peptic ulcer disease, not Crohn's disease.

D. An oral temperature of 102°F: While fever can occur in Crohn's disease during acute flare-ups, it is not a specific or definitive symptom of the condition. The primary symptoms are gastrointestinal in nature, such as abdominal pain and altered bowel habits.

A. High conjugated, high direct: In cirrhosis and alcoholic liver disease, the liver's ability to process bilirubin is impaired, leading to elevated levels of both conjugated (direct) and unconjugated bilirubin, causing jaundice. B. High direct, high unconjugated: Both direct (conjugated) and unconjugated bilirubin levels are elevated, but this does not clarify the direct relationship with jaundice. C. Low indirect, normal unconjugated: In liver disease, bilirubin levels are elevated, not low or normal.

Correct Answer is D

Explanation

A. Hyperproteinemia and increased drug effect: In cirrhosis, hypoproteinemia (low protein levels) occurs due to decreased protein synthesis by the liver, and drug metabolism is often impaired, leading to increased drug effects, but hyperproteinemia is not a typical finding.

B. Hyperkalemia and fluid retention: While fluid retention is common due to hypoalbuminemia and portal hypertension, hyperkalemia is not a direct consequence of hepatocyte dysfunction.

C. Hypercortisolism and increased infection risk: Hypercortisolism is not typically associated with cirrhosis. However, increased infection risk is common due to compromised immune function.

D. An elevated blood glucose and ammonia level: In cirrhosis, the liver's ability to metabolize ammonia is impaired, leading to elevated levels. Additionally, impaired glucose metabolism can result in hyperglycemia.

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A patient has recently been diagnosed with multiple sclerosis. Which response best explains the etiology of multiple sclerosis (MS)?

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Naxlex Comprehensive Predictor Exams

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Correct Answer is D

Explanation

A. High unconjugated, low direct: In liver disease, both conjugated (direct) and unconjugated bilirubin levels are typically elevated.

Correct Answer is D

Explanation

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