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 D
Explanation
Choice A reason: Avoiding strenuous activity and standing up slowly is not a relevant response to the client's complaint of headache. These actions may help prevent or reduce orthostatic hypotension, which is another possible side effect of nitroglycerin, but not headache.
Choice B reason: Headache is expected and should subside with continued use is a correct and appropriate response to the client's complaint of headache. The nurse should explain that headache is a common and transient side effect of nitroglycerin, which is caused by the vasodilation effect of the drug. The nurse should also advise the client to take over-the-counter analgesics, such as acetaminophen, to relieve the headache.
Choice C reason: Reducing the dosage to help relieve this side effect is not a correct or appropriate response to the client's complaint of headache. The nurse should not suggest any changes in the prescribed dosage of nitroglycerin, as this may compromise the effectiveness of the drug and increase the risk of angina or myocardial infarction. The nurse should also remind the client to follow the instructions for applying and removing the Nitropatch.
Choice D reason: You will have this side effect as long as you are taking nitroglycerin is not a correct or appropriate response to the client's complaint of headache. The nurse should not discourage or alarm the client by implying that the headache is inevitable and permanent. The nurse should reassure the client that the headache will likely diminish over time as the body adapts to the drug.
Correct Answer is C
Explanation
Choice A reason: Placing the patch on the anterior chest is not the best discharge instruction for this client. Clonidine is a drug that lowers blood pressure by stimulating alpha-2 receptors in the brain. ¹ The patch delivers the drug through the skin and into the bloodstream. ² The patch should be applied to a hairless area on the upper arm or torso, not the chest, to ensure proper absorption and avoid irritation. ³
Choice B reason: Removing the patch if a headache develops is not a good discharge instruction for this client. Headache is a common side effect of clonidine, especially when starting or changing the dose. ² Removing the patch abruptly may cause a rebound increase in blood pressure, which can be dangerous. ³ The client should keep the patch on for 7 days, unless instructed otherwise by the provider, and report any severe or persistent headaches.
Choice C reason: Rotating the application sites and inspecting the skin is the best discharge instruction for this client. Rotating the sites helps prevent skin irritation and allergic reactions from the patch. ³ Inspecting the skin helps detect any signs of infection, inflammation, or rash that may require medical attention. The client should also wash the old site with soap and water after removing the patch. ²
Choice D reason: Monitoring weight on a daily basis is not a necessary discharge instruction for this client. Weight is not a sensitive indicator of the effectiveness or safety of clonidine therapy. Weight may be monitored periodically to assess the client's fluid status and possible signs of heart failure, which clonidine can help prevent. ¹ However, this is not a priority action for the client using the patch.
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