A nurse is caring for a patient who has been prescribed enoxaparin (Lovenox) subcutaneously for prophylaxis against deep vein thrombosis (DVT). The nurse should instruct the patient to:

Avoid foods that are high in vitamin K.

Administer injections into areas with decreased subcutaneous tissue.

Massage injection sites after administration.

Use a soft-bristled toothbrush.

Answer and Explanation

The Correct Answer is D

The correct answer is choice D) Use a soft-bristled toothbrush.

This is because enoxaparin (Lovenox) is an anticoagulant that prevents blood clots by thinning the blood. Therefore, patients who take enoxaparin should avoid activities that can cause bleeding, such as using a hard-bristled toothbrush, flossing, shaving, or cutting their nails.

Choice A) Avoid foods that are high in vitamin K is wrong because vitamin K interacts with warfarin, another anticoagulant, but not with enoxaparin. Vitamin K helps the blood clot, so patients who take warfarin should avoid foods that are high in vitamin K, such as leafy green vegetables, broccoli, or liver.

Choice B) Administer injections into areas with decreased subcutaneous tissue is wrong because enoxaparin should be injected into areas with adequate subcutaneous tissue, such as the abdomen or the thighs. Injecting into areas with decreased subcutaneous tissue can cause bruising, pain, or hematoma formation.

Choice C) Massage injection sites after administration is wrong because massaging the injection sites can cause bleeding, bruising, or irritation. Patients who take enoxaparin should not rub or press on the injection sites after administration.

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Correct Answer is C

Explanation

Activated partial thromboplastin time (aPTT).

Dabigatran (Pradaxa) is a direct oral anticoagulant (DOAC) that inhibits thrombin, a key enzyme in the coagulation cascade.

Dabigatran prolongs the aPTT, which is a measure of the intrinsic and common pathways of coagulation.The aPTT can be used to monitor the anticoagulant effect of dabigatran, although routine monitoring is not required.

Choice A) Prothrombin time (PT) is wrong because PT measures the extrinsic and common pathways of coagulation, which are not affected by dabigatran.

PT is used to monitor warfarin therapy, not dabigatran.

Choice B) International normalized ratio (INR) is wrong because INR is a standardized version of PT that is used to monitor warfarin therapy, not dabigatran.

INR is not affected by dabigatran.

Choice D) Platelet count is wrong because platelet count is a measure of the number of platelets in the blood, which are involved in primary hemostasis.

Platelet count is not affected by dabigatran, which acts on secondary hemostasis.

Normal ranges for these tests are:

• aPTT: 25 to 35 seconds

• PT: 11 to 13.5 seconds

• INR: 0.8 to 1.2

• Platelet count: 150,000 to 450,000 per microliter of blood

A. Activated partial thromboplastin time (aPTT) B. Prothrombin time (PT) C. International normalized ratio (INR) D. Platelet count.

Correct Answer is C

Explanation

Warfarin is an anticoagulant that inhibits the synthesis of vitamin K-dependent clotting factors. The INR is a standardized measure of the prothrombin time (PT), which reflects the degree of anticoagulation.The therapeutic range for INR is 2 to 3 for most conditions, and higher for some mechanical heart valves.

Choice A) Activated partial thromboplastin time (aPTT) is wrong because it is used to monitor heparin therapy, not warfarin therapy.

Heparin is another anticoagulant that works by activating antithrombin III, which inhibits thrombin and factor Xa.The therapeutic range for aPTT is 1.5 to 2.5 times the normal value, which is 30 to 40 seconds.

Choice B) Prothrombin time (PT) is wrong because it is not a standardized measure of the warfarin effect.

The PT can vary depending on the reagents and methods used by different laboratories.The INR was developed to eliminate this variability and provide a consistent measure of the warfarin effect.

Choice D) Platelet count is wrong because it is not affected by warfarin therapy.

Warfarin does not affect the number or function of platelets, only the clotting factors.Platelet count can be used to monitor other conditions that affect hemostasis, such as thrombocytopenia or thrombocytosis.

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A nurse is caring for a patient who has been prescribed enoxaparin (Lovenox) subcutaneously for prophylaxis against deep vein thrombosis (DVT). The nurse should instruct the patient to:

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Naxlex Comprehensive Predictor Exams

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