The nurse is caring for a client with Parkinson's disease. The nurse understands the client is on both levodopa and carbidopa for which of the following reasons?
The use of carbidopa prevents dyskinesia.
Using both drugs prevents drug tolerance.
The combination of both medications is necessary to prevent side effects.
The carbidopa prevents the premature metabolism of levodopa.
The Correct Answer is D
A. Carbidopa does not directly prevent dyskinesia. Dyskinesia is often a side effect of long-term levodopa therapy. Carbidopa’s role is to help optimize the effectiveness of levodopa and reduce side effects, but it does not specifically prevent dyskinesia.
B. The combination of levodopa and carbidopa does not prevent drug tolerance. Drug tolerance refers to the reduced effect of a drug over time, and while the combination may help with optimal absorption and effectiveness, it doesn't directly address tolerance.
C. While carbidopa helps reduce some side effects (such as nausea and vomiting) by preventing the peripheral breakdown of levodopa, the primary purpose of combining the two drugs is not solely to prevent side effects but to improve levodopa's effectiveness and absorption in the brain.
D. Carbidopa inhibits the enzyme aromatic L-amino acid decarboxylase (AADC) in the peripheral tissues, preventing the premature breakdown (metabolism) of levodopa into dopamine before it reaches the brain. This allows more levodopa to enter the brain and be converted into dopamine, enhancing the therapeutic effect for Parkinson's disease.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["35"]
Explanation
Insulin syringes are commonly marked in units rather than milliliters (mL). If it's a U-100 insulin syringe, each marking represents 1 unit. The plunger in the image above is at 35 indicating 35 units of insulin.
Correct Answer is C
Explanation
A. In Graves' disease, the immune system attacks the thyroid gland, but the result is an overproduction of thyroid hormones (hyperthyroidism), not a decrease.
B. Graves' disease is an autoimmune disorder in which the immune system produces antibodies (known as thyroid-stimulating immunoglobulins) that stimulate the thyroid gland to produce excess thyroid hormones. It is not primarily an inflammatory condition.
C. Immunoglobulins cause excess in thyroid hormones Graves' disease is an autoimmune disorder in which the body produces thyroid-stimulating immunoglobulins (TSIs) that bind to thyroid cells and stimulate the thyroid to produce excess thyroid hormones. This leads to hyperthyroidism.
D. Graves' disease is more commonly seen in women, particularly those between the ages of 20 and 40. Men are less likely to develop this condition.
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