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Early diagnosis and evolution of deafness in childhood bacterial meningitis: a study using brainstem auditory evoked
Insights
Brainstem auditory evoked potential (BAEP) monitoring aids early bacterial meningitis diagnosis and deafness prognosis. Abnormal BAEPs within two weeks indicate potential hearing loss, highlighting the need for continued auditory surveillance.
Area of Science:
- Pediatrics
- Neurology
- Audiology
Background:
- Bacterial meningitis poses a significant risk of hearing impairment in children.
- Early detection and monitoring of auditory function are crucial for managing potential sequelae.
Observation:
- Serial brainstem auditory evoked potential (BAEP) recordings were performed on 51 children with bacterial meningitis.
- Abnormalities were observed in 31.4% of children, with 9.8% showing persistent abnormalities and deafness.
- Normal and abnormal BAEP findings at discharge correlated with 3-month audiometry results.
Findings:
- BAEPs identified early-onset deafness in bacterial meningitis patients.
- The first two weeks of illness represent a critical period for auditory recovery or deterioration.
- No late-onset deafness or significant recovery was noted after hospital discharge.
Implications:
- BAEPs demonstrate prognostic value for hearing loss in pediatric bacterial meningitis.
- While useful for early detection, BAEPs alone are insufficient for comprehensive auditory assessment.
- Continued clinical auditory surveillance and conventional audiometry are essential for complete evaluation of hearing deficits.
Abstract:
Fifty-one children with bacterial meningitis were studied prospectively using serial recordings of brainstem auditory evoked potential (BAEP) from the earliest phase of the disease, according to a standardized protocol. The objectives were to make an early diagnosis and follow the evolution of deafness in the course of meningitis and evaluate the prognostic value of BAEP. Thirty-five children (68.6%) always had normal recordings; 11 children (21.6%) had transient BAEP abnormalities (prolonged wave V latency or elevated threshold for wave I), and five children (9.8%) had persistent pathologic BAEP recordings from the first examination at 48 hours until discharge from the hospital and have a persistent deafness. All recordings that were normal or pathologic at discharge were confirmed by behavioral audiometry 3 months later. These results show the early occurrence of deafness in the course of meningitis with a crucial phase of possible recovery or worsening occurring during the first 2 weeks. There were no cases of "late" deafness or "late" recovery (there was sometimes slight improvement) occurring after discharge; thus BAEPs have a prognostic value. However, observation of a child with clinically proven selective high-frequency postmeningitic deficit but without a hearing handicap, a disorder that was diagnosed early with BAEP (which tests only the high frequencies), is a warning that this method alone is insufficient and that clinical auditory surveillance and conventional audiometry remain necessary.