What is the significance of elevated serum levels of troponin?

This intracellular substance can leak into the blood with cardiac cellular injury or death.

Elevated serum levels of troponin occur because of sustained glycogenolysis.

This substance is elevated when a patient has acute tubular necrosis.

Serum elevation of this acute phase reactant occurs because of tissue injury.

Answer and Explanation

The Correct Answer is A

Choice A rationale
Elevated serum levels of troponin indicate cardiac cellular injury or death. Troponin is a protein released into the bloodstream when heart muscle cells are damaged, such as during a myocardial infarction.
Choice B rationale
Sustained glycogenolysis does not cause elevated troponin levels. Glycogenolysis is the breakdown of glycogen to glucose, primarily occurring in the liver and muscles, not related to troponin release.
Choice C rationale
Acute tubular necrosis does not elevate troponin levels. This condition affects the renal tubules and is typically indicated by elevated creatinine and BUN levels.
Choice D rationale
Troponin is not an acute phase reactant. Acute phase reactants are proteins whose levels change in response to inflammation, such as C-reactive protein (CRP), not troponin.

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Correct Answer is B

Explanation

Choice A rationale
Nausea and vomiting can be caused by various conditions, including gastrointestinal issues and brain injuries, but they are not specifically indicative of a diffuse brain stem injury.
Choice B rationale
Nuchal rigidity, or neck stiffness, is a classic sign of meningeal irritation, often due to meningeal edema in conditions like meningitis.
Choice C rationale
Bilateral fixed and dilated pupils are more commonly associated with severe brain injury or increased intracranial pressure, not specifically a cerebellar brain attack.
Choice D rationale
Brudzinski’s sign is a physical exam finding indicative of meningeal irritation, commonly seen in bacterial meningitis, not specifically viral meningitis.

A. Administer vitamin B12 to increase RBC size. B. Administer vitamin B12 to restore normal RBC maturation. C. Administer medication to decrease RBC size. D. Administer iron to increase the formation of hemoglobin molecules.

Correct Answer is B

Explanation

Choice A rationale
Administering vitamin B12 to increase RBC size is not appropriate in this scenario. The elevated MCV indicates macrocytic anemia, which is often due to vitamin B12 deficiency. The goal is to restore normal RBC maturation, not to increase RBC size.
Choice B rationale
Administering vitamin B12 to restore normal RBC maturation is the appropriate action. The elevated MCV indicates macrocytic anemia, which is often due to vitamin B12 deficiency.
Administering vitamin B12 will help restore normal RBC maturation and correct the anemia.
Choice C rationale
Administering medication to decrease RBC size is not appropriate in this scenario. The elevated MCV indicates macrocytic anemia, which is often due to vitamin B12 deficiency. The goal is to restore normal RBC maturation, not to decrease RBC size.
Choice D rationale
Administering iron to increase the formation of hemoglobin molecules is not appropriate in this scenario. The elevated MCV indicates macrocytic anemia, which is often due to vitamin B12 deficiency. Iron supplementation is typically used for microcytic anemia, not macrocytic anemia.

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What is the significance of elevated serum levels of troponin?

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Naxlex Comprehensive Predictor Exams

Which pieces of information link up correctly?

Correct Answer is B

Explanation

A nurse is reviewing a client’s complete blood count (CBC) and notes an RBC count of 3.5 million/mm³ and a mean corpuscular volume (MCV) of 102 mm³. Based on these values, the most appropriate action for the nurse would be to:

Correct Answer is B

Explanation

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