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Bacterial meningitis. Rational selection and use of antibacterial drugs
Abstract:
Bacterial meningitis is a continuing challenge. This applies especially to infections in the neonate and the elderly, and to those which are hospital acquired. Factors which maintain the high morbidity and significant mortality from this disease include microbial virulence, a limited host response to infection within the cerebrospinal fluid (CSF), where phagocyte function is often impaired and complement and opsonic antibody activity are deficient, as well as delays in diagnosis and treatment. Added to these adverse factors is the pharmacokinetic hurdle of the 'blood-brain barrier', which limits drug concentrations achievable within the CSF. Inflammatory changes certainly improve the penetration of many agents, especially the penicillins and cephalosporins, but it must be remembered that with resolution of inflammation, achievable concentrations decline. Hence, the necessity for continuing parenteral administration of antibiotics throughout the treatment period. Although penicillin G (benzylpenicillin) remains the drug of choice for both pneumococcal and meningococcal infections, increasing resistance to ampicillin among Haemophilus influenzae has lead to greater reliance on alternative agents. Chloramphenicol is widely used, yet is potentially toxic, so that therapy with cefuroxime and the newer cephalosporins has been increasingly advocated. The advent of these potent, broad spectrum cephalosporins has induced a reappraisal of the treatment of Gram-negative bacillary meningitis, where ampicillin resistance and poor CSF penetration by the aminoglycosides have contributed to an unsatisfactory impact on outcome. Agents such as cefotaxime and ceftazidime have proved effective, although greater controlled experience is required. Finally, the contagious nature of meningococcal and H. influenzae infections justifies offering chemoprophylaxis to selected contacts, with rifampicin (or minocycline for contacts of patients with meningococcal infections).
Insights
Bacterial meningitis remains a significant health challenge, particularly in vulnerable populations. Advances in cephalosporins offer improved treatment options for Gram-negative infections, while chemoprophylaxis aids in controlling outbreaks.
Area of Science:
- Infectious Diseases
- Neurology
- Pharmacology
Background:
- Bacterial meningitis presents ongoing challenges, especially in neonates, the elderly, and hospital-acquired infections.
- High morbidity and mortality are linked to microbial virulence, impaired host response in cerebrospinal fluid (CSF), and diagnostic/treatment delays.
- The blood-brain barrier limits achievable drug concentrations in the CSF, necessitating parenteral antibiotic administration.
Purpose of the Study:
- To review current challenges and therapeutic strategies for bacterial meningitis.
- To evaluate the role of newer antibiotics, particularly cephalosporins, in treating meningitis.
- To discuss chemoprophylaxis for contagious meningitis pathogens.
Main Methods:
- Review of existing literature on bacterial meningitis treatment and challenges.
- Analysis of antibiotic efficacy, resistance patterns, and pharmacokinetic properties.
- Discussion of therapeutic options including penicillin, chloramphenicol, cefuroxime, and newer cephalosporins.
Main Results:
- Penicillin G remains a primary choice for pneumococcal and meningococcal infections.
- Increasing ampicillin resistance in Haemophilus influenzae necessitates alternative agents like chloramphenicol (with toxicity concerns) or newer cephalosporins.
- Broad-spectrum cephalosporins (e.g., cefotaxime, ceftazidime) show promise for Gram-negative bacillary meningitis, though further data is needed.
- Chemoprophylaxis with rifampicin or minocycline is recommended for contacts of specific meningitis cases.
Conclusions:
- Effective management of bacterial meningitis requires addressing microbial factors, host response, and pharmacokinetic challenges.
- Newer cephalosporins represent significant advancements in treating resistant Gram-negative meningitis.
- Chemoprophylaxis plays a crucial role in preventing secondary transmission of highly contagious meningitis strains.