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What is the significance of elevated serum levels of troponin?

A.

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

B.

Elevated serum levels of troponin occur because of sustained glycogenolysis.

C.

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

D.

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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View Related questions

Correct Answer is A

Explanation

Choice A rationale

A positive Brudzinski’s sign is indicative of meningitis. It involves involuntary lifting of the legs when the neck is flexed, suggesting meningeal irritation.

Choice B rationale

A positive Babinski’s sign indicates central nervous system pathology but is not specific to meningitis. It involves dorsiflexion of the big toe when the sole of the foot is stimulated.

Choice C rationale

A positive Romberg’s sign indicates issues with proprioception and balance but is not specific to meningitis. It involves swaying or falling when standing with eyes closed.

Choice D rationale

A positive Murphy’s sign indicates gallbladder inflammation (cholecystitis) and is not related to meningitis. It involves pain on palpation of the right upper quadrant during inspiration.

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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