The nurse is reviewing the chart of a client with an indication of myocardial infarction or unstable angina. Which laboratory test result(s) should the nurse recognize as an indication of myocardial injury? (Select all that apply)
Elevated troponins
Decreased homocysteine levels
Elevated CK-MB
Decreased alkaline phosphatase (ALP)
Increased platelet count
Correct Answer : A,C
Choice A: Elevated troponins. This is a correct answer. Troponins are proteins that regulate the myocardial contractile process². They are released into the bloodstream when the myocardial cells are damaged by ischemia or infarction². Troponins are highly specific and sensitive indicators of myocardial injury². The normal range for troponin I is less than 0.03 ng/mL and for troponin T is less than 0.01 ng/mL².
Choice B: Decreased homocysteine levels. This is not a correct answer. Homocysteine is an amino acid that is involved in the metabolism of methionine². Elevated homocysteine levels are associated with an increased risk of cardiovascular disease, but they are not a direct marker of myocardial injury². The normal range for homocysteine is 5 to 15 micromol/L².
Choice C: Elevated CK-MB. This is a correct answer. CK-MB is one of the isoenzymes of creatine kinase, an enzyme that catalyzes the conversion of creatine to phosphocreatine, which is used for energy storage in the muscles². CK-MB is found mainly in the myocardium and is released into the blood when the myocardial cells are injured². CK-MB is a specific and sensitive marker of myocardial injury, but it is less specific than troponins². The normal range for CK-MB is 0 to 3 ng/mL².
Choice D: Decreased alkaline phosphatase (ALP).This is not a correct answer. ALP is an enzyme that is found in various tissues, such as the liver, bone, intestine, and placenta². ALP is not a marker of myocardial injury, and its levels are not affected by ischemia or infarction². The normal range for ALP is 30 to 120 U/L².
Choice E: Increased platelet count.This is not a correct answer. Platelets are blood cells that are involved in hemostasis and clot formation². Increased platelet count, or thrombocytosis, can be a sign of inflammation, infection, malignancy, or other conditions². Platelet count is not a marker of myocardial injury, and it does not reflect the extent of ischemia or infarction². The normal range for platelet count is 150,000 to 450,000 per microliter of blood².
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A reason: Increasing the intake of dietary fiber is not related to the instruction for carvedilol. Dietary fiber is beneficial for lowering cholesterol and blood sugar levels, but it does not affect the action or side effects of carvedilol. The client should follow a balanced diet that is low in sodium, fat, and cholesterol.
Choice B reason: This is the correct answer. Changing from a lying to sitting position slowly is an important instruction for carvedilol. Carvedilol is a beta-blocker that lowers the blood pressure and the heart rate. It can cause orthostatic hypotension, which is a sudden drop in blood pressure when changing positions. This can lead to dizziness, fainting, or falls. The client should change positions gradually and avoid sudden movements.
Choice C reason: Expecting weight gain of 6-8 pounds is not an instruction for carvedilol. Weight gain is not a common or expected side effect of carvedilol. It can indicate fluid retention, which can worsen the heart condition and the blood pressure. The client should monitor their weight regularly and report any significant changes to the health care provider.
Choice D reason: Taking the medication after eating breakfast is not an instruction for carvedilol. Carvedilol can be taken with or without food, depending on the client's preference and tolerance. The important thing is to take the medication at the same time every day and not to skip or double the doses.
Correct Answer is D
Explanation
Choice A reason: I should continue to read the labels of foods I select at the grocery store is not a statement that indicates a need for further clarification by the nurse. This statement shows that the client understands the importance of choosing foods that are low in sodium, fat, and calories, which can help lower blood pressure and prevent complications.
Choice B reason: Keeping my blood pressure under control reduces my risk for a heart attack is not a statement that indicates a need for further clarification by the nurse. This statement shows that the client understands the benefits of pharmacologic therapy for hypertension, which can prevent or delay the development of cardiovascular disease.
Choice C reason: When I get out of bed in the morning, I should first sit for a few minutes and then stand is not a statement that indicates a need for further clarification by the nurse. This statement shows that the client understands how to prevent or minimize orthostatic hypotension, which is a possible side effect of some anti-hypertensive medications.
Choice D reason: I will be able to stop my anti-hypertensive medication when my blood pressure is normal is a statement that indicates a need for further clarification by the nurse. This statement shows that the client has a misconception about the nature and duration of pharmacologic therapy for hypertension. The nurse should explain that hypertension is a chronic condition that requires lifelong treatment and monitoring, and that stopping the medication abruptly can cause a rebound increase in blood pressure and increase the risk of complications.
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