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Microbiology and treatment of brain abscess
1Department of Paediatrics, Georgetown University School of Medicine, Washington DC, USA.
Abstract:
Brain abscess is a focal pyogenic infection of the brain's parenchyma. The most frequent intracranial locations (in descending order of frequency) are: frontal-temporal, frontal-parietal, partial, cerebellar, and occipital lobes. The major predisposing factors are: an associated contiguous focus of infection, trauma, and hematogenous spread from a distant focus. The microbial etiology depends on the site of the primary infection; the patient's age, underlying condition, and immune status; and the geographic location. The organisms most commonly isolated are anaerobic bacteria, aerobic and microaerophilic streptococci, Enterobacteriaceae, and Staphylococcus aureus. Specimens obtained during surgery or stereotactic computerized axial tomography (CT) guided aspiration should be sent for aerobic, anaerobic, mycobacterial and fungal culture and, when indicated, for protozoa. Before abscess encapsulation and localization, antimicrobial therapy, accompanied by measures to control increasing intracranial pressure, are essential. Once an abscess has formed, surgical excision or drainage combined with prolonged antibiotics (usually 4-8weeks) remains the treatment of choice.
Insights
Brain abscess, a focal pyogenic brain infection, requires prompt antimicrobial therapy and intracranial pressure management. Surgical excision or drainage with prolonged antibiotics is the preferred treatment once the brain abscess is localized.
Area of Science:
- Neurology
- Infectious Diseases
- Microbiology
Background:
- Brain abscess is a focal pyogenic infection within the brain parenchyma.
- Common intracranial locations include frontal-temporal, frontal-parietal, parietal, cerebellar, and occipital lobes.
- Predisposing factors include contiguous infections, trauma, and hematogenous spread.
Purpose of the Study:
- To outline the etiology, diagnosis, and management of brain abscesses.
- To detail the common microbial culprits and diagnostic methods.
- To describe current treatment strategies for brain abscess.
Main Methods:
- Review of microbial etiology based on primary infection site, patient factors, and geography.
- Emphasis on diagnostic specimens for aerobic, anaerobic, mycobacterial, fungal, and protozoal cultures.
- Description of therapeutic approaches including antimicrobial therapy, ICP management, and surgical intervention.
Main Results:
- Commonly isolated organisms include anaerobic bacteria, streptococci, Enterobacteriaceae, and Staphylococcus aureus.
- Early antimicrobial therapy and ICP control are crucial before abscess encapsulation.
- Surgical excision or drainage combined with 4-8 weeks of antibiotics is the treatment of choice for formed abscesses.
Conclusions:
- Effective management of brain abscesses necessitates a multi-faceted approach.
- Prompt diagnosis and targeted antimicrobial therapy are vital.
- Surgical intervention combined with prolonged antibiotic treatment offers the best outcomes.
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