Heparin and Warfarin Therapy
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A nurse is caring for a client who has deep vein thrombosis and has been on heparin continuous infusion for 5 days. The provider prescribes warfarin PO without discontinuing the heparin. The client asks the nurse why both anticoagulants are necessary. Which of the following statements should the nurse make?
"Warfarin takes several days to work, so the IV heparin will be used until the warfarin reaches a therapeutic level."
"I will call the provider to get a prescription for discontinuing the IV heparin today."
"Both heparin and warfarin work together to dissolve the clots."
"The IV heparin increases the effects of the warfarin and decreases the length of your hospital stay."
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Step by Step Written Solution
In this problem, we are looking at a clinical situation where a client with deep vein thrombosis is transitioning from an IV heparin infusion to oral warfarin. The client wants to know why they need both medications simultaneously.
Heparin and Warfarin Bridging Therapy
Let's break down the pharmacokinetics of these two drugs to understand why this overlap is necessary.
| Medication | Onset of Action |
|---|---|
| Heparin (IV) | Immediate |
| Warfarin (PO) | 3 to 5 days |
Heparin acts immediately to prevent further clot formation, but it must be administered through an intravenous line or injection. Warfarin is an oral pill that is easier for the patient to manage at home, but it takes several days to deplete existing clotting factors and reach a therapeutic level.
This period of overlap is known as bridging therapy. We cannot stop the heparin until the warfarin has built up enough in the bloodstream to be effective on its own.
Now let's evaluate the given options based on this medical reasoning.
Evaluating Options
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