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What is the primary advantage of using low molecular weight heparins (LMWHs) over heparin?

A.

LMWHs produce a more stable effect on coagulation; thus, fewer lab tests are needed.

B.

LMWHs may be given by the oral route

C.

LMWHs have a short duration of action

D.

LMWHs possess greater anticoagulant activity

Answer and Explanation

The Correct Answer is A

A. LMWHs produce a more stable effect on coagulation; thus, fewer lab tests are needed: Correct LMWHs have a more predictable anticoagulant response compared to unfractionated heparin, resulting in a more stable effect on coagulation. Because of their predictable response, routine monitoring of coagulation parameters, such as activated partial thromboplastin time (aPTT), is typically not required with LMWH therapy, unlike with unfractionated heparin.

B. LMWHs may be given by the oral route: Incorrect. LMWHs are administered by the subcutaneous route.

C. LMWHs have a short duration of action: Incorrect. LMWHs have a longer duration of action compared to unfractionated heparin.

D. LMWHs possess greater anticoagulant activity: incorrect. LMWHs generally have less potent anticoagulant activity compared to unfractionated heparin, but their more predictable response and longer half-life make them advantageous in many clinical scenario


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Related Questions

Correct Answer is {"dropdown-group-1":"B"}

Explanation

A. Minutes: This is too short a timeframe for warfarin's effect. It takes longer for the body's existing clotting factors to be depleted.

B. Days: This medication works by inhibiting the production of vitamin K-dependent clotting factors in the liver. As existing clotting factors are used up and new ones aren't produced as efficiently, it takes time for the anticoagulant effect to become significant.

C. Weeks: While the full effect might take some time (around 3-5 days), several weeks is an overestimation for most patients.

D. Hours: A few hours might show some initial effect, but it's not enough time for a substantial anticoagulant effect. It usually takes at least a day or two.

Correct Answer is {"dropdown-group-1":"A","dropdown-group-2":"A"}

Explanation

a. Hemostasis: Hemostasis refers to the process of stopping bleeding or preventing excessive blood loss. It involves several steps, including vasoconstriction, platelet aggregation, and clot formation. Hemostasis is the correct answer because it directly addresses the stopping of blood flow to protect the body from injury.

b. Thrombolytics: Thrombolytics are medications used to dissolve blood clots. They are not the natural mechanism for stopping blood flow. Thrombolytics are not the correct answer in this context.

c. Hematopoiesis: Hematopoiesis is the process of forming blood cells (including red blood cells, white blood cells, and platelets) in the bone marrow. It is essential for maintaining blood cell populations but does not directly stop blood flow. Hematopoiesis is not related to stopping blood flow.

d. Anticoagulation: Anticoagulation refers to preventing blood clot formation. While it is important for certain medical conditions, it does not directly stop blood flow. Anticoagulation is not the primary mechanism for stopping bleeding.

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