A client is taking aspirin (ASA) and asks the nurse how long the anticoagulant effect of a single dose of aspirin can last. The nurse replies:

"The anticoagulant effect of a single dose of aspirin can last for as long as a month."

"The anticoagulant effect of a single dose of aspirin can last for as long as a day."

"The anticoagulant effect of a single dose of aspirin can last for as long as a week."

"The anticoagulant effect of a single dose of aspirin can last for as long as 12 hours."

Answer and Explanation

The Correct Answer is C

A. "The anticoagulant effect of a single dose of aspirin can last for as long as a month." This statement is incorrect. While aspirin has antiplatelet effects that inhibit blood clot formation, its duration of action is not as long as a month. Aspirin irreversibly inhibits the enzyme cyclooxygenase (COX), thereby inhibiting platelet aggregation. However, the effects on platelet function are not permanent, and platelets turnover within a few days, thus the anticoagulant effect of a single dose of aspirin typically lasts for a shorter duration.

B. "The anticoagulant effect of a single dose of aspirin can last for as long as a day." Aspirin's primary effect is on platelets, not directly on overall blood clotting. It inhibits the COX enzyme, reducing the production of thromboxane A2, a chemical that promotes platelet aggregation. The initial inhibition of platelet function is strongest within the first 24 hours after taking aspirin. However, the affected platelets remain dysfunctional for their entire lifespan (around 7-10 days).

C. "The anticoagulant effect of a single dose of aspirin can last for as long as a week." This statement is correct. Aspirin's effect on platelets is due to its irreversible inhibition of the COX enzyme. Platelets have a lifespan of about 7-10 days. Once a platelet is affected by aspirin, it cannot regain its function. As your body continuously produces new platelets, the overall antiplatelet effect gradually diminishes over time.

D. "The anticoagulant effect of a single dose of aspirin can last for as long as 12 hours."

Rationale: This statement is partially correct. The antiplatelet effect of aspirin does not typically last as short as 12 hours. While the peak inhibition of platelet function occurs within hours after administration, the duration of action is longer due to the irreversible inhibition of COX-1. However, stating that it lasts exactly 12 hours may not be entirely accurate for all individuals, as the duration of action can vary depending on factors such as individual metabolism and dose.

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Correct Answer is D

Explanation

A. Fish oil: While fish oil has some evidence for reducing inflammation, the evidence for its effectiveness in treating arthritis is mixed.

B. DHEA: DHEA is a hormone and there is not enough evidence to support its use for arthritis.

C. Garlic and soy: While garlic and soy have some general health benefits, there is no strong evidence they are effective for treating arthritis.

D. Chondroitin and glucosamine: These supplements are the most studied option for arthritis and some studies have shown they may provide modest pain relief, although the evidence is not conclusive.

A. "This medication will not break down clots but will make it less likely that the clot will get larger." B. "It will break down the clot within 8 to 12 hours of administration." C. "It will take 7 to 10 days for the clot to break down." D. "You will need to be on this medication for a long time before it will break down the clot."

Correct Answer is A

Explanation

A. "This medication will not break down clots but will make it less likely that the clot will get larger." Warfarin (Coumadin) is an anticoagulant medication that works by inhibiting the synthesis of certain clotting factors in the liver. It does not directly break down existing clots but prevents the formation of new clots and the extension of existing ones. This response provides accurate information about the mechanism of action of warfarin.

B. "It will break down the clot within 8 to 12 hours of administration." This statement is incorrect. Warfarin does not have an immediate effect on existing clots. Its action is primarily preventive, reducing the risk of further clot formation and allowing the body's natural processes to gradually break down existing clots over time.

C. "It will take 7 to 10 days for the clot to break down." While the body's natural processes may start breaking down the clot within this timeframe, warfarin itself does not directly cause the dissolution of clots. This response is partially accurate in terms of the timeline for the body's natural clot resolution but does not specify that warfarin itself is not responsible for clot breakdown.

D. "You will need to be on this medication for a long time before it will break down the clot." This statement is misleading. Warfarin's role is to prevent the formation of new clots and further extension of existing ones rather than directly breaking down clots. Additionally, the duration of warfarin therapy is typically determined based on the individual's risk factors for clot formation, and it may not necessarily correlate with the time it takes for existing clots to resolve.

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A client is taking aspirin (ASA) and asks the nurse how long the anticoagulant effect of a single dose of aspirin can last. The nurse replies:

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