AIIMS Raipur NO - 2019 (Shift-2)
Pharmacology
Easy
People with mechanical valves require taking this medication lifelong?
Appeared in: AIIMS Raipur NO - 2019 (Shift-2)
Explanation
- Mechanical heart valves are made of non-biological materials, which are highly thrombogenic (promote blood clot formation).
- Lifelong anticoagulation is the standard of care to prevent the formation of blood clots on the valve, which can lead to life-threatening complications like stroke or valve obstruction.
- Warfarin, a vitamin K antagonist, is the most common oral anticoagulant used for this purpose, requiring regular blood monitoring (INR).
- The goal of therapy is to maintain a therapeutic level of anticoagulation, balancing the prevention of clots against the risk of bleeding.
Why Other Options Were Wrong
- Option A: Antipyretics are medications used to reduce fever. They have no role in preventing complications related to mechanical heart valves and are only taken as needed.
- Option B: Analgesics are used for pain relief. They are not a required lifelong therapy for mechanical valves. Furthermore, certain analgesics like NSAIDs are often contraindicated as they increase bleeding risk when taken with anticoagulants.
- Option D: Antibiotics are used to treat or prevent bacterial infections. While prophylactic antibiotics may be prescribed before specific high-risk procedures (e.g., dental work) to prevent infective endocarditis, they are not taken continuously for life.
Related Visual
Clinical Relevance
- Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pharmacological management for patients with prosthetic heart valves as background academic context rather than a clinical decision trigger.
- Patient education is a critical nursing responsibility. Nurses must teach patients on warfarin about the importance of regular International Normalized Ratio (INR) monitoring to ensure the blood is within the therapeutic range.
- Patients must be educated to recognize and report signs of both bleeding (e.g., unusual bruising, black stools, bleeding gums) and clotting (e.g., sudden weakness, slurred speech, shortness of breath).
- Dietary consistency is key. Patients should be advised to maintain a stable intake of Vitamin K (found in leafy green vegetables), as sudden changes can interfere with warfarin's effectiveness.
How to Approach the Question
- First, identify the key clinical terms in the question: 'mechanical valves' and 'lifelong medication'.
- Recall the primary characteristic of a mechanical valve: it is a foreign object placed within the circulatory system.
- Consider the body's natural response to foreign materials in the bloodstream. The coagulation cascade is activated, leading to a high risk of blood clot formation.
- Evaluate the given options based on this primary risk. Which medication class directly addresses the problem of blood clotting?
- Anticoagulants are designed to prevent blood clots. Antipyretics (for fever), analgesics (for pain), and antibiotics (for infection) treat separate, intermittent conditions and do not address the constant risk of thrombosis from the valve.
- Conclude that anticoagulants are the only logical lifelong medication required specifically because of the mechanical valve.
Concept Tested & Keywords
- Concept Tested: Pharmacological management for patients with prosthetic heart valves.
- Stem keywords: mechanical valves, lifelong, medication
- Lead-in keywords: require taking
- Negative lead-in flag: false
Question ID
QbXQG8AK8kiQfeq6eKm59w
Reference Book
E6 Nursing Brunner Adult Health 3SA Vol 1 Part 3 p. 8-10
E6 Pharmacology Nurses Shanbhag 3e p. 228-230
E6 Pharmacology KD Tripathi Essentials 9e Part 1 p. 238-240
Practise the full AIIMS Raipur NO - 2019 (Shift-2)
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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