A patient diagnosed with deep vein thrombosis asks the nurse, “How does this blood thinner heparin work?” Which response is most accurate?
Heparin makes the blood less thick and easier to flow.
Heparin dissolves the clot and decreases the formation of platelets.
Heparin does not thin the blood; it prevents new clots from forming.
Heparin decreases the number of platelets so the blood flows more easily.
The Correct Answer is C
Choice A rationale
Heparin does not actually thin the blood or make it less thick. Instead, it works by increasing the activity of antithrombin, a protein that inhibits blood clotting. This prevents new clots from forming and existing clots from growing larger.
Choice B rationale
Heparin does not dissolve clots or decrease the formation of platelets. Its primary action is to increase the activity of antithrombin, which in turn inactivates thrombin and factor Xa, two key players in the blood clotting process.
Choice C rationale
This statement is accurate. Heparin does not thin the blood; instead, it prevents new clots from forming and existing clots from growing larger. It does this by increasing the activity of antithrombin, which in turn inactivates thrombin and factor Xa.
Choice D rationale
Heparin does not decrease the number of platelets or make the blood flow more easily. Its primary action is to increase the activity of antithrombin, which in turn inactivates thrombin and factor Xa.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale
A serum fasting glucose of 101 mg/dL is slightly above the normal range (70-100 mg/dL), indicating a possible prediabetes condition. However, it is not a contraindication for trimethoprim-sulfamethoxazole.
Choice B rationale
A platelet count of 160,000 uL is within the normal range (150,000-450,000 uL). Therefore, it is not a contraindication for trimethoprim-sulfamethoxazole.
Choice C rationale
A hemoglobin level of 13.6 g/dL is within the normal range for both men (13.5-17.5 g/dL) and women (12.0-15.5 g/dL). Thus, it is not a contraindication for trimethoprim-sulfamethoxazole.
Choice D rationale
A serum creatinine level of 2.5 mg/dL is above the normal range (0.6-1.2 mg/dL for men, 0.5- 1.1 mg/dL for women), indicating impaired kidney function. Trimethoprim-sulfamethoxazole is contraindicated in patients with severe renal insufficiency.
Correct Answer is A
Explanation
Choice A rationale
The hemoglobin A1C test, also known as the HbA1C or glycated hemoglobin test, is a blood test that evaluates glycemic control over a 3-month period by measuring the glucose attached to hemoglobin. This test is commonly used to diagnose and monitor diabetes. It provides an average of your blood sugar levels over the past 2-3 months, which can help healthcare providers assess how well diabetes is being managed.
Choice B rationale
The hemoglobin A1C test does not use the level of serum protein to evaluate glycemic control. Instead, it measures the amount of glucose that is attached to the hemoglobin in your red blood cells.
Choice C rationale
The hemoglobin A1C test does not evaluate serum ketone production over several days. Ketones are produced when the body burns fat for energy, which can occur when there is not enough insulin to help your body use sugar for energy. High levels of ketones can lead to diabetic ketoacidosis, a serious condition that requires immediate medical attention.
Choice D rationale
The hemoglobin A1C test does not determine the amount of glucose attached to hemoglobin over the last seven days. Instead, it provides an average of your blood sugar levels over the past 2-3 months. -
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