The drug of choice for methicillin-resistant staphylococcus aureus (MRSA) is:
Gentamicin
Nafcillin
Vancomycin
Penicillin
The Correct Answer is C
A. Gentamicin: Gentamicin is an aminoglycoside antibiotic effective against many bacteria, but it's not the first choice for MRSA. Vancomycin or other alternatives are preferred due to the rising resistance of MRSA to gentamicin.
B. Nafcillin: Nafcillin is a penicillin antibiotic, often used for penicillin-sensitive staphylococcal infections. However, it is not effective against MRSA, which is resistant to many penicillin-based antibiotics.
C. Vancomycin: Vancomycin is a glycopeptide antibiotic used to treat a variety of bacterial infections, including MRSA. It works by inhibiting cell wall synthesis in bacteria, making it effective against Gram-positive bacteria that have developed resistance to other antibiotics like methicillin (which MRSA has).
D. Penicillin: Penicillin is a group of antibiotics that includes drugs like amoxicillin and ampicillin. MRSA is resistant to penicillin-based antibiotics, so they are not effective against MRSA infections.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Most type-1 reactions are allergic: This statement is accurate. Type-1 hypersensitivity reactions are typically associated with allergies. When a person is exposed to a specific allergen (like pollen or certain foods), their immune system overreacts, leading to various symptoms, from mild to severe.
B. It is mediated by IgA: This statement is incorrect. Type-1 hypersensitivity reactions are primarily mediated by immunoglobulin E (IgE) antibodies. When these antibodies bind to allergens, they trigger the release of histamine and other chemicals, causing allergic symptoms.
C. It never contributes to autoimmune diseases: This statement is incorrect. While type-1 hypersensitivity reactions are often associated with allergies, they are distinct from autoimmune diseases. In autoimmune diseases, the immune system mistakenly attacks the body's own cells and tissues, which is a different mechanism from hypersensitivity reactions.
D. Most occur against medications: This statement is not entirely accurate. While some type-1 hypersensitivity reactions can be triggered by medications (like penicillin), they can also be caused by various other allergens such as pollen, animal dander, insect venom, and certain foods. The prevalence of medication-induced type-1 reactions varies, and it's not accurate to say that most occur against medications.
Correct Answer is C
Explanation
A. Dermatitis and headaches: Prednisone use can sometimes cause skin issues, but dermatitis is not a common side effect. Headaches can also occur, but they are not specific to long-term prednisone therapy.
B. Heart failure and headaches: Prednisone does not directly cause heart failure. Headaches can occur but are not specific indicators of prednisone side effects.
C. Hyperglycemia and osteoporosis: Prednisone can lead to elevated blood glucose levels (hyperglycemia) and increased bone loss (osteoporosis) when used long-term. Regular monitoring is essential to manage these potential side effects.
D. Weight loss and hypoglycemia: Prednisone can cause weight gain rather than weight loss. Hypoglycemia (low blood sugar) is not a common side effect of prednisone; it typically causes hyperglycemia (high blood sugar) instead.
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