[Value of cortical acoustic evoked potentials in sensorineural hypoacusis of vascular genesis]

Sixty patients 19 to 43 years of age (28 females and 22 males) with neurosensory hypoacusis (NH) of vascular genesis were examined using long-latent acoustic evoked potentials. The patients were divided into three groups. Group 1 consisted of 20 NH patients with initial hypertension, frequent headache, vertigo, sleeplessness, irritability but no complaints of hearing problems. Group 2 and 3 consisted of 20 NH patients each with initial and marked hearing problems, respectively. Compared to a control group of healthy subjects, all the examined vascular NH patients had longer latent periods of long-latent acoustic evoked potentials components P2 and N2, especially patients of group 1 in whom these periods made up 197.8 +/- 3.6 and 316.3 +/- 8.2 ms, respectively, in ipsilateral stimulation with the tone 1 kHz and 198.2 +/- 4.8 and 316.9 +/- 8.4 ms in 4 kHz stimulation. This suggests evident interest of cortical and subcortical structures of the acoustic analyzer in such patients. These values in group 1 differed from those in groups 2 and 3 in both types of stimulation (p < 0.05). These data deepen our knowledge about etiology of pathogenesis of neurosensory disorders in cardiovascular disorders and ascertain the role of vascular and neurogenic factors in their development.