The antidote to warfarin toxicity is what?
Vitamin B12.
Vitamin K.
Calcium gluconate.
Protamine sulfate
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
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Nitroglycerin sublingual is a medication that is used to treat chest pain or angina by relaxing the blood vessels and reducing the oxygen demand of the heart.A common side effect of nitroglycerin sublingual is headache, which may be severe and throbbing.Headache is often a sign that the medication is working.Other possible side effects include flushing, dizziness, lightheadedness, nausea, vomiting, fast heart rate, numbness, tingling, burning pain, rash, hives, sweating, pale skin, difficulty breathing and allergic reaction.
Choice A is wrong because nausea is not the most common adverse effect of nitroglycerin sublingual.Nausea may occur in some people, but it is usually mild and transient.
Choice B is wrong because bradycardia (slow heart rate) is not a common adverse effect of nitroglycerin sublingual.Nitroglycerin sublingual may cause tachycardia (fast heart rate) in some people as a result of vasodilation and reflex stimulation of the heart.
Choice C is wrong because hypertension (high blood pressure) is not a common adverse effect of nitroglycerin sublingual.Nitroglycerin sublingual may cause hypotension (low blood pressure) in some people due to its vasodilating action.Hypotension may lead to lightheadedness, fainting or shock in severe cases.
The normal range for blood pressure is less than 120/80 mmHg for adults.
The normal range for heart rate is 60 to 100 beats per minute for adults.
Correct Answer is B
Explanation
According to the World Health Organization (WHO), noncommunicable diseases (NCDs) are the leading cause of death globally, accounting for 74% of all deaths. NCDs are chronic diseases that are not transmitted from person to person, such as cardiovascular diseases, cancers, chronic respiratory diseases and diabetes.The main risk factors for NCDs are modifiable behaviours, such as tobacco use, physical inactivity, unhealthy diet and the harmful use of alcohol.These behaviours can lead to metabolic risk factors, such as raised blood pressure, increased blood glucose, elevated blood lipids and obesity, which in turn increase the risk of developing NCDs. Therefore, lifestyle changes that reduce these risk factors can prevent or delay many NCDs and improve health outcomes.
Choice A is wrong because trauma is not a major contributing factor to many diseases.Trauma is an injury or damage to living tissue caused by an external force, such as accidents, violence or natural disasters.Trauma can result in acute or chronic conditions, such as infections, fractures, burns, bleeding or organ failure.
However, trauma is not a common cause of NCDs, which are the main burden of disease globally.
Choice C is wrong because congenital factors are not the greatest contributing factor to many diseases.Congenital factors are those that are present at birth, such as genetic disorders, birth defects or inherited diseases.Congenital factors can affect the development and function of various organs and systems in the body, leading to various health problems.
However, congenital factors are not the main cause of NCDs, which are largely influenced by environmental and behavioural factors.
Choice D is wrong because genetics is not the greatest contributing factor to many diseases.
Genetics is the study of how traits are inherited and expressed in living organisms.
Genetics can influence the susceptibility and resistance to various diseases, as well as the response to treatment and prevention strategies.
However, genetics is not the sole determinant of health and disease, as environmental and behavioural factors also play a significant role in modulating gene expression and function.
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