The antidote to warfarin toxicity is what?

Vitamin B12.

Vitamin K.

Calcium gluconate.

Protamine sulfate

Answer and Explanation

The Correct Answer is B

Vitamin K is the antidote for warfarin toxicity because it can reverse the effects of warfarin by restoring the clotting factors. Warfarin is an oral anticoagulant that works by inhibiting vitamin K epoxide reductase, an enzyme that activates vitamin K in the body. Vitamin K is needed for the synthesis of active coagulation factors, such as II, VII, IX and X. By blocking vitamin K, warfarin reduces the blood’s clotting activity and prevents the formation of blood clots.

Choice A is wrong because vitamin B12 is not involved in the coagulation cascade. Vitamin B12 is mainly involved in DNA synthesis, red blood cell production and nerve function.

Choice C is wrong because calcium gluconate is not an antidote for warfarin toxicity. Calcium gluconate is used to treat low blood calcium levels or hypocalcemia. Calcium is also a cofactor for some coagulation factors, but it does not reverse the effects of warfarin.

Choice D is wrong because protamine sulfate is not an antidote for warfarin toxicity.

Protamine sulfate is used to reverse the effects of heparin, another type of anticoagulant that works by inhibiting thrombin and factor Xa.

Protamine sulfate does not affect the vitamin K-dependent coagulation factors that are inhibited by warfarin.

Normal ranges for coagulation tests that are affected by warfarin are:

• Prothrombin time (PT): 11 to 13.5 seconds

• International normalized ratio (INR): 0.8 to 1.2

• Activated partial thromboplastin time (aPTT): 25 to 35 seconds

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Free Nursing Study Resources

Correct Answer is A

Explanation

Erectile dysfunction drugs should not be used when a patient is taking nitrates.This is because both types of drugs cause blood vessels to dilate, which can lead to a dangerous drop in blood pressure. This can increase the risk of heart attack, stroke or fainting.

Choice B is wrong because alpha-adrenergic blockers are sometimes used together with nitrates to treat high blood pressure and angina. They work by relaxing the smooth muscles of the blood vessels, which lowers blood pressure and improves blood flow.

Choice C is wrong because calcium channel blockers are also used to treat high blood pressure and angina. They work by blocking the entry of calcium into the muscle cells of the heart and blood vessels, which reduces the force of contraction and relaxes the blood vessels.

Choice D is wrong because beta-adrenergic blockers are another class of drugs that can be used with nitrates to treat high blood pressure and angina. They work by blocking the effects of adrenaline on the heart and blood vessels, which slows down the heart rate and lowers blood pressure.

Normal ranges for blood pressure vary depending on age, gender and other factors, but generally they are between 90/60 mmHg and 120/80 mmHg for healthy adults.

A. Change position slowly when rising from a chair. B. Maintain a steady intake of green leafy vegetables. C. Consume no more than 1 L/day of fluid. D. Take this medication in the evening.

Correct Answer is D

Explanation

Simvastatin is a type of drug called a statin, which lowers cholesterol and triglycerides in the blood. Statins work by reducing the amount of cholesterol made by the liver, and the liver produces more cholesterol at night.Therefore, taking simvastatin in the evening can increase its effectiveness.

Choice A is wrong because changing position slowly when rising from a chair is not related to simvastatin use.

This advice is usually given to people who have low blood pressure or take medications that lower blood pressure, such as diuretics or beta blockers.

Choice B is wrong because maintaining a steady intake of green leafy vegetables is not specific to simvastatin use.

This advice is usually given to people who take anticoagulants, such as warfarin, because green leafy vegetables contain vitamin K, which can affect the blood clotting process.

Choice C is wrong because consuming no more than 1 L/day of fluid is not related to simvastatin use.

This advice is usually given to people who have fluid retention or heart failure, because excess fluid can put strain on the heart and lungs.

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The antidote to warfarin toxicity is what?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

Which drug class should not be used when a patient is taking nitrates?

Correct Answer is A

Explanation

Anu is reinforcing teaching with a client who is starting simvastatin. Which of the following information should the nurse include?

Correct Answer is D

Explanation

Which of the following Alpha adrenergic class has a vasodilating effect and can be used for the management of hypertension?

Digoxin (Lanoxin) is a cardiac glycoside that is among the oldest medications used for heart failure. What are its two primary actions?

Which administration strategy can a patient implement to reduce flushing, the most common adverse effect of niacin therapy?

Certain factors place us at risk for the development of cardiovascular disease. Which of the following are modifiable risk factors? Select all that apply.

If the patient PTT lab level is too long and greater than 80 seconds, the nurse should notify the doctor. Which doctor’s order should the nurse anticipate?

A patient with a history of heart failure is prescribed furosemide (Lasix). Several days after the aggressive diuretic therapy started, the patient began to exhibit confusion, tremors, muscle cramps, and nausea. What does the nurse suspect?

The use of diuretics in the treatment of heart failure may lead to what condition?

A nurse is preparing to administer subcutaneous enoxaparin 40 mg using a prefilled syringe of enoxaparin 40 mg/0.4 ml to an adult client following hip arthroplasty. Which of the following actions should the nurse plan to take?