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Chapter 34: Problem 267

A client with atrial fibrillation is receiving warfarin (Coumadin) \(5 \mathrm{mg}\) each day. His INR today is 1.8. What is the expected decision regarding change in medication dosage? A. His INR is too low. His warfarin dose needs to be increased. B. His INR is too high. His warfarin dose needs to be decreased. C. His INR is too high. His warfarin dose needs to be increased. D. His INR is within desired range. No change is warfarin dose is needed.

Short Answer

Expert verified
A. His INR is too low. His warfarin dose needs to be increased.

Step by step solution

01

- Understanding INR

INR stands for International Normalized Ratio, and it is a measure of how long it takes blood to clot. The target INR for a patient on warfarin for atrial fibrillation is typically between 2.0 and 3.0.
02

- Analyzing Current INR

The client's current INR is 1.8. This is below the target range of 2.0 to 3.0.
03

- Decision Based on INR

Since the INR is below the target range, the blood is clotting faster than desired. To bring the INR into the target range, the dose of warfarin needs to be increased.
04

- Review Answer Choices

A. His INR is too low. His warfarin dose needs to be increased.B. His INR is too high. His warfarin dose needs to be decreased.C. His INR is too high. His warfarin dose needs to be increased.D. His INR is within desired range. No change in warfarin dose is needed.
05

- Selecting the Correct Answer

The correct answer is A: His INR is too low. His warfarin dose needs to be increased.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

atrial fibrillation
Atrial fibrillation (AFib) is a common type of heart arrhythmia characterized by an irregular and often rapid heart rate. When someone has AFib, the heart's two upper chambers, called the atria, beat irregularly and out of coordination with the two lower chambers (the ventricles). This can lead to a variety of symptoms including:
  • Palpitations
  • Fatigue
  • Shortness of breath
  • Dizziness

One major complication associated with AFib is the increased risk of blood clots forming in the heart. These clots can then travel to other parts of the body, including the brain, leading to stroke. Therefore, managing AFib often involves the use of blood-thinning medications like warfarin to prevent clot formation.
warfarin dosage adjustment
Warfarin is an anticoagulant medication used to reduce the risk of stroke in patients with AFib. The effectiveness and safety of warfarin depend significantly on maintaining the right dosage. Too little warfarin and blood clots might form; too much and there is a risk of excessive bleeding. Hence, it is crucial to regularly monitor the patient's INR (International Normalized Ratio).
Regular monitoring enables healthcare providers to adjust the dosage accordingly. Here's a simplified guide to dosage adjustment:
  • If INR is below the target range, increase the warfarin dosage.
  • If INR is within the target range, maintain the current dosage.
  • If INR is above the target range, decrease the warfarin dosage.

Always follow your healthcare provider's guidance on adjusting warfarin dosage. Sudden changes or incorrect dosing can have severe consequences.
target INR range
The International Normalized Ratio (INR) is a standardized number that indicates how long it takes for blood to clot. For patients with atrial fibrillation taking warfarin, the target INR range is typically between 2.0 and 3.0. This range is considered therapeutic, meaning it strikes a balance between preventing clotting (too low INR) and avoiding excessive bleeding (too high INR).
Whenever a patient's INR falls outside this range, healthcare providers must make adjustments. As outlined earlier:
  • An INR below 2.0 suggests blood is clotting too quickly, increasing the risk of stroke, which can be managed by raising the warfarin dose.
  • An INR above 3.0 indicates blood is clotting too slowly, increasing the risk of bleeding, and requires reducing the warfarin dose.

Having regular blood tests to monitor INR helps in keeping it within the target range and ensures that the warfarin therapy is effective and safe.

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Most popular questions from this chapter

A nurse is working in the labor and delivery unit. The nurse assesses all the laboring clients and notes that one has a small baby in breech position, one has a large baby who is engaged, one has an average sized infant in a transverse lie, and the last has an average sized infant with a floating head. Which client will the nurse definitely have to prepare for a cesarean delivery? The client with the A. small baby in breech position B. large baby who is engaged C. average sized infant in transverse lie D. average sized infant with a floating head

A 13-month-old child is to receive an oral medication. The child starts crying as soon as the nurse enters the room with the medication despite the fact that his mother is telling him a story. After checking the child's identification bracelet, how should the nurse proceed with administering the medication? A. Blow gently across his face with a soft whistling sound to stop the crying. B. Allow the mother to administer the medication. C. Delay giving the medication until the child is calmer. D. Hold the child on his or her lap in a semi-Fowler's position.

The client is receiving Heparin IV at 1200 units/hour as part of the treatment regime for pulmonary embolism. The nurse notes that the urine has become bright red in color. The nurse would prepare to administer which of the following medications? A. Protamine Sulfate B. Aquamephyton (vitamin K) C. Warfarin (Coumadin) D. Acetylcysteine (Mucomyst)

Which cranial nerve is the nurse assessing when the client鈥檚 gag reflex is checked? A. Five (trigeminal) B. Six (abducens) C. Nine (glossopharyngeal) D. Twelve (hypoglossal)

The nurse is assessing an elderly client and notes the following findings. Which assessment findings would the nurse identify as a normal signs of aging? Mark all that apply. A. Increase in diastolic blood pressure B. Reduced lens elasticity C. Reduced vital capacity D. Decreased force of myocardial contraction
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