The nurse evaluates the effects of warfarin by monitoring what lab test?
Platelet count.
Activated thromboplastin time (APT).
Red blood count (RBC).
Prothrombin time (PT) and international normalized ratio (INR).
The Correct Answer is D
Choice A rationale
Platelet count measures the number of platelets in the blood, which are essential for blood clotting. However, it is not specific to monitoring the anticoagulant effects of warfarin.
Choice B rationale
Activated thromboplastin time (APT) measures the intrinsic pathway of coagulation and is typically used to monitor heparin therapy, not warfarin.
Choice C rationale
Red blood count (RBC) measures the number of red blood cells in the blood, which can indicate anemia but is unrelated to the anticoagulant effects of warfarin.
Choice D rationale
Prothrombin time (PT) and international normalized ratio (INR) are specific tests used to monitor the anticoagulant effects of warfarin. PT measures the time it takes for blood to clot, and INR standardizes this measurement to ensure consistency across different laboratories.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A rationale
Myasthenia gravis primarily affects voluntary muscles, especially those involved in breathing and facial movements. Gastrointestinal (GI) and lower extremity muscles are generally not the main muscles affected by this condition. It is an autoimmune disorder that impacts the neuromuscular junction, where nerves communicate with muscles, leading to muscle weakness and fatigue.
Choice B rationale
The central nervous system (CNS), memory, and cognition are not typically impacted by myasthenia gravis. This disorder primarily involves peripheral nervous system issues that affect voluntary muscle control rather than cognitive functions. Myasthenia gravis does not cause alterations in memory or cognition as seen with central nervous system disorders like Alzheimer's disease.
Choice C rationale
Myasthenia gravis notably affects respiratory and facial muscles. The autoimmune attack on acetylcholine receptors leads to muscle weakness, particularly in muscles controlling eye movements, facial expressions, and breathing. Patients may experience difficulty breathing, swallowing, and maintaining an open airway due to this muscle weakness.
Choice D rationale
The cardiovascular system and postural muscles are not commonly affected by myasthenia gravis. This condition involves the neuromuscular junction and leads to fatigue in voluntary muscles, primarily those involved in eye movement, facial expressions, and respiration. Cardiovascular symptoms are not a direct consequence of myasthenia gravis.
Correct Answer is C
Explanation
Choice A rationale
Atorvastatin (Lipitor) does not decrease sitosterol. It mainly targets serum cholesterol and LDL levels to reduce cardiovascular risks.
Choice B rationale
Atorvastatin does not decrease campesterol. Its primary effect is on serum cholesterol and LDL levels, aiming to lower the risk of heart disease.
Choice C rationale
Atorvastatin effectively decreases serum cholesterol and LDL levels, which are the primary targets for reducing cardiovascular risks in patients with high cholesterol.
Choice D rationale
Atorvastatin lowers both serum cholesterol and LDL levels, not just serum cholesterol, making it effective in reducing overall cardiovascular risk.
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