Meningitis: empirical therapy and adjustments MCQs With Answer

Meningitis: empirical therapy and adjustments MCQs With Answer

Introduction: This MCQ set is designed for M. Pharm students preparing for Pharmacotherapeutics II (MPP 202T). It focuses on empirical antibiotic choices, modifications after culture results, special-population adjustments, drug pharmacokinetics in meningitis, steroid adjunctive therapy, and important safety considerations. Questions emphasize clinical reasoning for neonates, children, adults, elderly, immunocompromised hosts, and nosocomial/CSF-shunt–associated infections. Each item tests knowledge of initial regimens, when to broaden or narrow therapy, renal and allergy-based dose or agent selection, therapeutic monitoring (e.g., vancomycin), and optimal duration for common pathogens. Use these MCQs to refine evidence-based decision making in meningitis pharmacotherapy.

Q1. In an adult (18–50 years) with suspected community-acquired acute bacterial meningitis, the recommended empirical inpatient regimen before culture results is:

• Vancomycin plus a third-generation cephalosporin (ceftriaxone or cefotaxime)
• Ampicillin alone
• Vancomycin plus meropenem
• Linezolid plus aztreonam

Correct Answer: Vancomycin plus a third-generation cephalosporin (ceftriaxone or cefotaxime)

Q2. For neonates with suspected bacterial meningitis (≤28 days), the usual empirical combination is:

• Ampicillin plus gentamicin or cefotaxime
• Ceftriaxone plus vancomycin
• Meropenem monotherapy
• Trimethoprim-sulfamethoxazole monotherapy

Correct Answer: Ampicillin plus gentamicin or cefotaxime

Q3. In patients >50 years or those who are immunocompromised, empirical therapy must include coverage for Listeria. The recommended addition is:

• Ampicillin
• Vancomycin
• Ciprofloxacin
• Ceftazidime

Correct Answer: Ampicillin

Q4. When a Gram stain of CSF shows gram-negative rods in a nosocomial post-neurosurgical patient, the empirical regimen should preferentially include:

• A beta-lactam with anti-pseudomonal activity (e.g., cefepime, ceftazidime, or meropenem) plus vancomycin
• Ampicillin plus gentamicin
• Ceftriaxone alone
• Linezolid plus doxycycline

Correct Answer: A beta-lactam with anti-pseudomonal activity (e.g., cefepime, ceftazidime, or meropenem) plus vancomycin

Q5. In a patient with a history of immediate-type (anaphylactic) penicillin allergy, the preferred empiric meningitis regimen is:

• Vancomycin plus a fluoroquinolone (e.g., moxifloxacin) or aztreonam for gram-negative coverage, and TMP-SMX for Listeria if indicated
• Ampicillin plus cefotaxime
• Ceftriaxone plus gentamicin
• Piperacillin-tazobactam alone

Correct Answer: Vancomycin plus a fluoroquinolone (e.g., moxifloxacin) or aztreonam for gram-negative coverage, and TMP-SMX for Listeria if indicated

Q6. Adjunctive dexamethasone in adult bacterial meningitis is most appropriate when:

• Administered before or with the first dose of antibiotics if pneumococcal meningitis is suspected to improve outcomes
• Given only after 48 hours of antibiotic therapy
• Never used because it reduces antibiotic penetration into CSF
• Given only to neonates regardless of pathogen

Correct Answer: Administered before or with the first dose of antibiotics if pneumococcal meningitis is suspected to improve outcomes

Q7. Ceftriaxone is contraindicated or should be avoided in neonates because of:

• Risk of bilirubin displacement and precipitates with calcium-containing solutions
• Severe nephrotoxicity unique to neonates
• Inability to penetrate inflamed meninges
• Lack of activity against gram-positive cocci

Correct Answer: Risk of bilirubin displacement and precipitates with calcium-containing solutions

Q8. After culture reveals penicillin-susceptible Streptococcus pneumoniae, the best antibiotic stewardship action is to:

• De-escalate to high-dose penicillin G or ampicillin based on susceptibility
• Continue vancomycin indefinitely
• Switch to gentamicin monotherapy
• Add an aminoglycoside to current regimen

Correct Answer: De-escalate to high-dose penicillin G or ampicillin based on susceptibility

Q9. Vancomycin therapeutic monitoring for meningitis management should prioritize:

• AUC-guided dosing (AUC24/MIC) to optimize efficacy and limit toxicity
• Trough concentration only (<5 mg/L always acceptable)
• No monitoring is required for short courses
• Monitoring only by CSF vancomycin levels

Correct Answer: AUC-guided dosing (AUC24/MIC) to optimize efficacy and limit toxicity

Q10. Which pharmacokinetic factor most increases antibiotic penetration into CSF during bacterial meningitis?

• Inflammation of the meninges disrupting the blood–brain barrier
• Concurrent administration of corticosteroids always increases penetration
• Decreased molecular size only is sufficient regardless of inflammation
• High plasma protein binding increases CSF penetration

Correct Answer: Inflammation of the meninges disrupting the blood–brain barrier

Q11. For confirmed Listeria monocytogenes meningitis in a patient allergic to penicillin, an effective alternative regimen is:

• Trimethoprim-sulfamethoxazole (TMP-SMX)
• Vancomycin monotherapy
• Ceftriaxone plus gentamicin
• Ciprofloxacin monotherapy

Correct Answer: Trimethoprim-sulfamethoxazole (TMP-SMX)

Q12. Duration of antibiotic therapy generally recommended for meningococcal meningitis (Neisseria meningitidis) is about:

• 7 days
• 14–21 days
• 3 days
• 6 weeks

Correct Answer: 7 days

Q13. In shunt- or device-associated meningitis where Staphylococcus epidermidis is suspected, the empiric regimen should emphasize:

• Vancomycin plus anti-gram-negative coverage (e.g., cefepime or ceftazidime) and consideration of hardware removal
• Ampicillin monotherapy
• Ceftriaxone monotherapy
• Linezolid alone without gram-negative coverage

Correct Answer: Vancomycin plus anti-gram-negative coverage (e.g., cefepime or ceftazidime) and consideration of hardware removal

Q14. Cefepime neurotoxicity risk is increased in meningitis patients primarily when:

• Renal function is impaired and doses are not appropriately reduced
• The drug is administered with dexamethasone
• Cefepime is given orally instead of intravenously
• Used in combination with vancomycin

Correct Answer: Renal function is impaired and doses are not appropriately reduced

Q15. Which statement about intrathecal or intraventricular antibiotic therapy is correct?

• It may be considered for CSF shunt-associated or refractory infections when systemic therapy fails to achieve adequate CSF concentrations
• It is first-line for all community-acquired meningitis
• It is never used due to high neurotoxicity
• It replaces the need for systemic antibiotics

Correct Answer: It may be considered for CSF shunt-associated or refractory infections when systemic therapy fails to achieve adequate CSF concentrations

Q16. Beta-lactam antibiotics used for meningitis are most often dosed at higher than usual systemic doses because:

• Time-dependent killing requires maintaining concentrations above MIC in CSF despite blood–brain barrier limitations
• They require once-weekly dosing for CSF penetration
• Higher doses reduce the need for combination therapy with vancomycin
• CSF protein binding increases and inactivates the drug

Correct Answer: Time-dependent killing requires maintaining concentrations above MIC in CSF despite blood–brain barrier limitations

Q17. Empiric change to meropenem is most justified when initial therapy fails and you suspect:

• Multidrug-resistant gram-negative bacilli or beta-lactamase–producing organisms including ESBL-producers
• Penicillin-susceptible Streptococcus pneumoniae only
• Viral meningitis
• Typical community-acquired meningococcal infection

Correct Answer: Multidrug-resistant gram-negative bacilli or beta-lactamase–producing organisms including ESBL-producers

Q18. Which of the following best describes the appropriate approach once culture and susceptibility results are available?

• De-escalate to the narrowest effective agent, adjust dose for pharmacokinetics and renal function, and define total duration by organism
• Continue broad-spectrum empiric therapy for the full course irrespective of susceptibilities
• Stop antibiotics immediately if the pathogen is identified
• Always add an aminoglycoside for synergy after cultures are positive

Correct Answer: De-escalate to the narrowest effective agent, adjust dose for pharmacokinetics and renal function, and define total duration by organism

Q19. Which pathogen typically requires the longest recommended treatment duration among these causes of bacterial meningitis?

• Listeria monocytogenes
• Neisseria meningitidis
• Haemophilus influenzae
• Neonatal E. coli uncomplicated meningitis

Correct Answer: Listeria monocytogenes

Q20. Which monitoring or supportive step is important during high-dose beta-lactam therapy for meningitis?

• Assess renal function regularly and adjust dosing to prevent toxicity and accumulation
• Measure CSF drug levels daily in all patients
• Avoid any concurrent anticonvulsant therapy
• Discontinue corticosteroids in all cases to improve drug penetration

Correct Answer: Assess renal function regularly and adjust dosing to prevent toxicity and accumulation

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