What is the main action of anticoagulant drugs?
To dissolve the existing clots.
To transport platelets.
To act as a fibrinolytic agent.
To prevent further clots from forming.
The Correct Answer is D
Anticoagulant drugs are medicines that prevent blood clots from forming or growing larger.
They do not dissolve existing clots or transport platelets. They work by interfering with different steps of the blood coagulation pathway, which is the process that leads to clot formation.
Choice A is wrong because anticoagulant drugs do not dissolve existing clots.
To dissolve clots, you need fibrinolytic drugs, which break down the fibrin mesh that holds the clots together.
Choice B is wrong because anticoagulant drugs do not transport platelets.
Platelets are blood cells that stick together to form clots.
Anticoagulant drugs may affect the function of platelets, but they do not move them around.
Choice C is wrong because anticoagulant drugs do not act as fibrinolytic agents.
Fibrinolytic agents are drugs that activate plasmin, an enzyme that breaks down fibrin.
Anticoagulant drugs may inhibit the formation of fibrin, but they do not break it down.
Some examples of anticoagulant drugs are warfarin, heparin, and factor Xa inhibitors.
The normal ranges for some blood tests that measure the effects of anticoagulants 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 C
Explanation
Positive inotropy and negative chronotropy.Digoxin is a cardiac glycoside that increases the force of the heart contractions (positive inotropy) and slows down the heart rate (negative chronotropy).
Choice A is wrong because positive chronotropy means increasing the heart rate, which is the opposite of what digoxin does.
Choice B is wrong because negative inotropy means decreasing the force of the heart contractions, which is also the opposite of what digoxin does.
Choice D is wrong because positive chronotropy means increasing the heart rate, which is not what digoxin does.
Digoxin is used to treat heart failure and atrial fibrillation, a type of irregular heartbeat.It has a narrow therapeutic window, meaning that the dose must be carefully adjusted to avoid toxicity or ineffectiveness.
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