Risk factors for an adverse outcome in bacterial meningitis in the tropics: a reappraisal with focus on the significance and risk of seizures.

The relationship of presentation to outcome in children with meningitis was analysed. The relative risk (95% confidence interval) of an adverse outcome (death or neurological sequelae) associated with presentation with at least three of ten features (age < or = 2 yrs, ill for > 7 days, antibiotic treatment, focal nerve deficits, abnormal posturing, abnormal muscle tone, lack of typical meningeal signs, shock, unrousable coma and seizures) was 4.9 (2.7, 8.8), p < 0.0001. The first six features were particularly associated with neurological sequelae, and shock and coma with death. Seizures were associated with either outcome. Two seizure types could be distinguished: seizures which occurred before or on diagnosis only (type I seizures) and seizures which occurred before and/or after diagnosis (type II seizures). Death occurred in 0/41 children without seizures and in 14/34 and 11/34 children with type I and type II seizures, respectively (p < 0.0001). Neurological sequelae occurred in 3/42 children without seizures and in 5/20 and 14/23 with type I and type II seizures, respectively (p < 0.0001).