[Bioelectrical activity of the cerebral cortex in children with different forms of hypoacusis]. / Kharakter bioélektricheskoi aktivnosti kory golovnogo mozga u deteis razlichnymi formami tugoukhosti.

The pattern of bioelectrical activity of the cerebral cortex of 65 children, aged 6 to 15 years, with neurosensory (35 subjects) and conductive (30 children) hypoacusis was investigated. The level of hearing impairment in the patients was different. Electroencephalographic and audiological data were processed by a computer and a statistical (predictable) model was obtained. The model describes the relationship between bioelectrical activity and hearing impairment type and level. It is found that in hypoacusis on a conductive or neurosensory EEG energy spectra and frequencies are different. It is concluded that EEG can be used for assessing the level of rehabilitation of children with marked hypoacusis.

A bacteriological and/or immunological study of anaerobic streptococcal infection in chronic tonsillitis, paratonsillitis and periodontitis patients.

Anaerobic streptococci were isolated from 100% of tonsil tissue samples obtained from 36 chronic tonsillitis patients. The strains displayed antigenic and other differences. Sera of chronic tonsillitis, paratonsillitis and periodontitis patients exhibited significantly more often, and in significantly higher titres, antibodies to the anaerobic streptococci isolated from tonsils than did sera of normal persons.