Dose optimisation of antibiotics used for meningitis

Area of Science:

• Pharmacology
• Infectious Diseases
• Neuroscience

Background:

• Central nervous system (CNS) infections like meningitis and ventriculitis cause significant patient morbidity and mortality.
• Achieving therapeutic antibiotic concentrations in the CNS is challenging due to altered pharmacokinetics (PK) in critical illness and poor antibiotic penetration across the blood-brain barrier.
• Current intravenous antibiotic dosing may not ensure adequate CNS exposure, even for susceptible bacteria.

Purpose of the Study:

• To review the pharmacodynamics (PD) and CNS pharmacokinetics (PK) of antibiotics used for Gram-negative bacterial CNS infections.
• To provide clinicians with practical dosing advice for managing CNS infections.
• To highlight the need for optimized antibiotic strategies in treating CNS infections.

Main Methods:

• Review of existing pharmacokinetic and pharmacodynamic studies on antibiotics for CNS infections.
• Analysis of antibiotic penetration through the blood-brain barrier.
• Evaluation of data on intraventricular antibiotic administration.

Main Results:

• Current intravenous antibiotic regimens may fail to achieve therapeutic CNS concentrations.
• Limited data exist for newer antibiotic combinations against multidrug-resistant Gram-negative bacteria.
• Intraventricular antibiotic administration shows improved patient outcomes but lacks robust PK-guided dosing.

Conclusions:

• Clinicians must consider bacterial minimum inhibitory concentrations and PK/PD principles for effective CNS infection treatment.
• Therapeutic drug monitoring should be utilized when available to guide antibiotic dosing.
• Intraventricular therapy is a valuable option for patients with ventricular drains to optimize outcomes.