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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

Increased shortness of breath is a key symptom of worsening congestive heart failure (CHF). It indicates that the heart is not effectively pumping blood, leading to fluid buildup in the lungs and increased respiratory effort.

Choice B rationale

A temperature of 37°C (98.6°F) is within the normal range and does not indicate worsening CHF. Monitoring the patient’s temperature is important, but it is not a sign of CHF exacerbation.

Choice C rationale

A blood pressure of 120/80 mmHg is within the normal range and does not indicate worsening CHF. Blood pressure should be monitored, but this reading does not suggest an acute issue.

Choice D rationale

Occasional dizziness can be a symptom of many conditions, including CHF, but it is not as specific or critical as increased shortness of breath. It should be monitored, but it does not indicate an immediate worsening of CHF.

Correct Answer is C

Explanation

Choice A rationale

A hemorrhagic brain attack (stroke) is less common than an ischemic brain attack. Ischemic strokes account for the majority of strokes.

Choice B rationale

Thrombolytic drugs are used to treat ischemic strokes, not hemorrhagic strokes. They do not cause hyper-reactive reflexes.

Choice C rationale

A hemorrhagic brain attack requires immediate intervention to prevent further damage. Hemorrhagic strokes involve bleeding in the brain, which can rapidly worsen and cause severe damage.

Choice D rationale

An ischemic brain attack is not necessarily less severe than a hemorrhagic brain attack. Both types of strokes are serious, but hemorrhagic strokes often require more urgent intervention due to the risk of ongoing bleeding.

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