Related Experiment Videos
Electron microscopic temporal bone histopathology in experimental pneumococcal meningitis.
J M Rappaport1, S M Bhatt, R S Kimura
1Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, USA.
The Annals of Otology, Rhinology, and Laryngology
|June 23, 1999
Summary
Bacterial meningitis can cause hearing loss in children. This study reveals early cochlear changes in a rabbit model, suggesting potential for reversible damage and therapeutic intervention.
Area of Science:
- Otolaryngology
- Neurology
- Pathology
Background:
- Bacterial meningitis is a leading cause of acquired sensorineural deafness in children.
- Assessing cochlear damage during acute meningitis is challenging.
- Streptococcus pneumoniae meningitis can lead to meningogenic labyrinthitis.
Purpose of the Study:
- To investigate temporal bone histopathology in a rabbit model of pneumococcal meningitis.
- To correlate hearing loss severity with cochlear ultrastructural changes.
- To explore potential for reversible damage and therapeutic strategies.
Main Methods:
- Developed a rabbit model of Streptococcus pneumoniae meningitis.
- Utilized electrophysiology to assess hearing loss.
- Examined temporal bones using light and transmission electron microscopy.
Main Results:
- Mild hearing loss showed outer hair cell degeneration and edema in cochlear nerve endings and stria vascularis.
- Severe hearing loss correlated with ultrastructural abnormalities in the organ of Corti and stria vascularis.
- Spiral ganglion cells and basal stria vascularis cells remained intact.
Conclusions:
- Early cochlear damage in bacterial meningitis involves specific cellular and ultrastructural changes.
- Findings suggest that some pathological changes may be reversible.
- This research provides insights into the pathophysiology of meningogenic deafness and potential therapeutic targets.