Which laboratory result would be elevated due to a myocardial infarction?
Troponin
Potassium
Hemoglobin
Creatinine
The Correct Answer is A
A. Troponin: Troponin is a cardiac-specific protein released into the bloodstream when myocardial cells are damaged. During a myocardial infarction (MI), necrosis of heart muscle elevates troponin levels within a few hours, making it the most sensitive and specific marker for acute myocardial injury. Serial measurements help confirm diagnosis and assess infarct size.
B. Potassium: Potassium levels may fluctuate during an MI due to cellular injury or reperfusion, but potassium is not a primary marker of myocardial infarction. Hyperkalemia or hypokalemia may occur secondary to complications but does not reliably indicate MI.
C. Hemoglobin: Hemoglobin reflects red blood cell concentration and is unaffected by myocardial ischemia or infarction. It may be influenced by blood loss or hydration status but is not elevated as a result of myocardial injury.
D. Creatinine: Creatinine reflects renal function and can rise in cases of acute kidney injury or chronic kidney disease. It is not directly elevated due to myocardial infarction unless secondary renal impairment occurs.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. A problem with maintaining and regulating temperature:Temperature regulation is controlled by the hypothalamus and autonomic nervous system. While important for homeostasis, it does not define cognition or the ability to process information.
B. The physical coordination of muscle groups in the body:Coordination of muscles, or motor function, is related to the cerebellum and motor pathways. This involves movement control rather than mental processes or awareness.
C. The ability to release hormones in response to stress:Hormonal responses to stress, such as cortisol release from the adrenal glands, are part of the endocrine system and the stress response. This is separate from cognitive function.
D. A state of awareness and the ability to perform tasks:Cognition encompasses mental processes such as attention, memory, problem-solving, reasoning, and awareness. It allows an individual to perceive, process, and respond to information and perform daily tasks effectively.
Correct Answer is A
Explanation
A. A person with a myocardial infarction having pain in the jaw:Referred pain occurs when pain is perceived at a location distant from its source. During a myocardial infarction, ischemia of the heart can trigger nerve pathways that the brain interprets as pain in areas like the jaw, neck, or left arm, even though the injury is in the heart.
B. A person with diabetes experiencing shooting pain in the feet:This describes neuropathic pain, often due to diabetic peripheral neuropathy. The pain originates in the affected nerves themselves rather than being referred from another site.
C. A person with a lower limb amputation feels pain in that limb:This is phantom limb pain, where the brain perceives pain in a limb that is no longer present. It is distinct from referred pain because the sensation originates from neural misfiring rather than from another injured organ.
D. A person with a broken arm experiencing pain at the injury site:Pain localized to the site of injury is direct or somatic pain, not referred pain. The brain accurately identifies the source as the damaged tissue itself.
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