RESUMO
Forty patients with neurosensory hearing disorders of vascular genesis were examined and divided into two groups. Patients with tone hearing disorders in conventional (0.125-8 kHz) and extended (9-16 kHz) frequency ranges entered group 1, those with such disorders in the extended range--group 2. Patients of group 1 had more pronounced cardiovascular dysfunction. Control group consisted of 15 persons with normal hearing. Electroencephalography (EEG) has shown that initial neurosensory hearing disorders were accompanied with redistribution of the main EEG rhythms especially in group 1. Compared to controls, these patients demonstrated significantly (p<0.05) reduced representation of alpha-rhythm while that of beta-activity rose showing involvement of cerebral cortical structures. Adequate preventive measures in patients with initial neurosensory hearing disorders of vascular genesis are able to protect such patients against development of neurosensory hypoacusis of vascular genesis.
Assuntos
Ritmo alfa , Ritmo beta , Perda Auditiva Neurossensorial/fisiopatologia , Hipertensão/complicações , Adulto , Audiometria , Audição/fisiologia , Perda Auditiva Neurossensorial/etiologia , Humanos , Hipertensão/fisiopatologia , Pessoa de Meia-Idade , Prognóstico , Índice de Gravidade de Doença , Adulto JovemRESUMO
The hearing function was studied as was the bioelectrical activity of the brain in workers exposed to noise in their occupations and in those persons coming into contact with ionizing radiation with normal and disordered hearing. The studies made showed that those persons under exposure to ionizing radiation exhibited more pronounced disturbances in the brain stem structures of the acoustic analyzer than those exposed to noise even if they were early in the course of the ear disorder. We consider it expedient to undertake studies on bioelectrical activity of the brain to gain further insights into the mechanisms of sensorineural hearing loss.
