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

Answer and Explanation

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.

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Correct Answer is D

Explanation

Choice A reason: Decreased hair is most likely a hereditary condition and nail changes are related to fungus is not the statement that describes the cause of this finding. This statement is not based on evidence and does not explain the relationship between peripheral vascular disease and the observed changes in the legs and feet.

Choice B reason: A blood clot may be forming and the client needs immediate intervention is not the statement that describes the cause of this finding. This statement is an alarmist and inaccurate interpretation of the finding. A blood clot would cause more acute and severe symptoms, such as pain, swelling, redness, and warmth in the affected area.

Choice C reason: Decreased oxygen to the tissues causes changes in hair growth and nail texture is the statement that describes the cause of this finding. This statement is based on the pathophysiology of peripheral vascular disease, which is a chronic condition that reduces the blood flow to the extremities due to atherosclerosis or inflammation of the blood vessels. The reduced blood flow leads to tissue ischemia and necrosis, which can manifest as hair loss, thickening and yellowing of the nails, skin ulcers, and gangrene.

Choice D reason: Depending on the client's age, the findings may be normal is not the statement that describes the cause of this finding. This statement is a vague and dismissive response that does not address the underlying problem of peripheral vascular disease. The findings are not normal for any age group and require further assessment and intervention.

A. Fried chicken, baked beans, French fries, and cake B. Tomato soup, fried flounder, white rice, and a grapefruit C. Barbecue pulled pork sandwich, fresh green beans, mashed potatoes, and ice cream D. Baked tuna, fresh broccoli, brown rice, and fresh cantaloupe

Correct Answer is D

Explanation

Choice A reason: This is a high-fat, high-sodium, and high-calorie meal that is not suitable for a client with hypertension. Fried foods, processed meats, and baked beans are sources of saturated fat and sodium that can raise blood pressure and cholesterol levels. Cake is a source of added sugar that can contribute to obesity and diabetes.

Choice B reason: This is a moderate-fat, moderate-sodium, and moderate-calorie meal that is not ideal for a client with hypertension. Fried flounder and tomato soup are sources of fat and sodium that can increase blood pressure. White rice is a refined carbohydrate that can spike blood sugar levels and increase the risk of diabetes.

Choice C reason: This is a high-fat, high-sodium, and high-calorie meal that is not appropriate for a client with hypertension. Barbecue pulled pork sandwich, mashed potatoes, and ice cream are sources of saturated fat and sodium that can elevate blood pressure and cholesterol levels. Fresh green beans are the only healthy component of this meal.

Choice D reason: This is a low-fat, low-sodium, and low-calorie meal that is suitable for a client with hypertension. Baked tuna, fresh broccoli, brown rice, and fresh cantaloupe are sources of lean protein, fiber, complex carbohydrates, vitamins, minerals, and antioxidants that can lower blood pressure and cholesterol levels, prevent obesity and diabetes, and promote cardiovascular health.

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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)

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