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Published on: November 5, 2019
[New developments in the diagnosis and therapy of acute bacterial meningitis]
Boris P Ehrenstein1, Bernd Salzberger, Thomas Glück
1Klinik und Poliklinik für Innere Medizin I, Klinikum der Universität Regensburg, 93042 Regensburg. boris.ehrenstein@klinik.uni-r.de
Background:
Acute bacterial meningitis is a medical emergency. Despite advances in the diagnosis and treatment it continues to have a high case-fatality rate and high rates of long-term neurologic sequelae.
Etiology:
Since the widespread use of the vaccine for Haemophilus influenzae type B, Streptococcus pneumoniae has replaced it as the most common cause of acute community-acquired bacterial meningitis in industrialized countries. The rising incidence of beta-lactam-resistant pneumococci has to be considered when choosing a regimen for empiric antibiotic therapy.
Diagnosis:
The clinical diagnosis remains difficult, as absent clinical meningeal signs do not exclude bacterial meningitis. If bacterial meningitis is considered a possible diagnosis, empiric antibiotic therapy should be initiated without any delay. Prior blood cultures and, if not contraindicated, a lumbar puncture should be performed. Based on new evidence, a screening cranial computed tomography to rule out raised intracranial pressure prior to lumbar puncture is recommended only for patients with defined risk factors (age > 60 years; preexisting immunodeficiency, immunosuppression, or neurologic diseases; recent seizures; any pathologic finding in the neurologic examination other than meningism).
Treatment:
Empiric antibiotic therapy should be initiated before cranial computed tomography. Adjuvant dexamethasone therapy initiated with or prior to the antibiotic therapy reduces mortality and morbidity for patients with pneumococcal meningitis without increasing the rate of side effects.
Insights
Acute bacterial meningitis requires prompt treatment. Early antibiotics and dexamethasone improve outcomes for pneumococcal meningitis, reducing mortality and long-term complications.
Area of Science:
- Infectious Diseases
- Neurology
- Critical Care Medicine
Context:
- Acute bacterial meningitis remains a critical medical emergency with significant mortality and neurological sequelae.
- Streptococcus pneumoniae is now the leading cause of community-acquired bacterial meningitis in industrialized nations, with increasing beta-lactam resistance.
- Accurate clinical diagnosis is challenging, as meningeal signs may be absent.
Purpose:
- To outline current diagnostic and treatment strategies for acute bacterial meningitis.
- To emphasize the importance of timely empiric antibiotic therapy.
- To highlight the role of adjuvant dexamethasone in pneumococcal meningitis.
Summary:
- Empiric antibiotic therapy should be initiated immediately if bacterial meningitis is suspected, preceding advanced imaging like cranial CT scans.
- Lumbar puncture for cerebrospinal fluid analysis is crucial but should be preceded by CT in patients with specific risk factors for increased intracranial pressure.
- Adjuvant dexamethasone therapy, given concurrently with or before antibiotics, is recommended for pneumococcal meningitis to reduce mortality and morbidity.
Impact:
- Timely intervention with appropriate antibiotics and dexamethasone can significantly decrease mortality and long-term neurological deficits associated with bacterial meningitis.
- Understanding the changing etiology, particularly the rise of resistant Streptococcus pneumoniae, is vital for effective empiric treatment strategies.
- Adherence to recommended diagnostic and treatment protocols can improve patient outcomes in this life-threatening condition.
Related Concept Videos
Bacterial Meningitis I: Introduction
Bacterial Meningitis II: Pathophysiology
Bacterial Meningitis
Viral Meningitis
Acute Pyelonephritis II: Diagnostic Studies and Management
Brain Abscess l: Introduction

