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.
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 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 A
Explanation
Choice A rationale
Administering supplemental oxygen is the priority intervention for a client with COPD who has an oxygen saturation of 88% on room air. This low oxygen saturation indicates hypoxemia, which requires immediate correction to prevent further respiratory distress.
Choice B rationale
Encouraging the client to use an incentive spirometer is important for lung expansion and preventing atelectasis, but it is not the priority intervention in this scenario. The immediate concern is to correct the hypoxemia.
Choice C rationale
Administering a bronchodilator as prescribed is important for managing COPD symptoms, but the priority intervention is to correct the hypoxemia by administering supplemental oxygen.
Choice D rationale
Positioning the client in high Fowler’s position can help improve breathing, but the priority intervention is to correct the hypoxemia by administering supplemental oxygen.