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
Acute pancreatitis is characterized by severe epigastric pain and elevated levels of amylase and lipase. These enzymes are released into the bloodstream when the pancreas is inflamed, making acute pancreatitis the most likely diagnosis.
Choice B rationale
Acute hematochezia refers to the passage of fresh blood through the anus, usually in or with stools. It is not associated with elevated amylase and lipase levels or severe epigastric pain.
Choice C rationale
Left heart failure can cause symptoms such as shortness of breath and fluid retention, but it does not typically cause elevated amylase and lipase levels or severe epigastric pain.
Choice D rationale
Chronic hepatic failure involves long-term liver damage and may present with jaundice, ascites, and other symptoms. It is not associated with elevated amylase and lipase levels or severe epigastric pain.
Correct Answer is B
Explanation
Choice A rationale
Deep vein thrombosis (DVT) can lead to pulmonary embolism but does not directly cause chest pain and shortness of breath.
Choice B rationale
Pulmonary embolus (PE) is characterized by chest pain, shortness of breath, and hemoptysis (coughing up blood), especially in patients on bed rest.
Choice C rationale
Anemia can cause fatigue and shortness of breath but not typically chest pain and hemoptysis.
Choice D rationale
Right heart failure can cause shortness of breath and edema but not typically chest pain and hemoptysis.