METHOD FOR PREDICTING ISCHEMIC LESION OF BRAIN STEM AT VESTIBULAR SCHWANNOMA Russian patent published in 2006 - IPC A61B5/484 A61B5/05 

FIELD: medicine, neurosurgery, neurology.

SUBSTANCE: one should study wink reflex to detect the lesion of oral departments in tegmentum of brain stem bridge and caudal departments of brain stem being counterlateral against vestibular schwannoma, moreover, it is necessary to study stem induced potentials. By the data obtained one should determine diagnostic coefficient that characterizes the degree of ischemic lesion of brain stem by the following formula: I=4.47+2.08φ₁-2.18φ₂-2.43α₁+2.26α₃+0.53α₅, where φ₁, φ₂- patient's values at lesions of caudal departments of brain stem and oral departments of tegmentum of brain stem bridge are accepted to be equal to 1, and in case of no lesion - to -1; α₁, α₃, α₅ - the values of latent periods I, III, V in peaks of acoustic stem induced potentials are accepted to be equal to -1 in case of correspondence to standard; and at any deviation against the standard - equal to 1 and at obtaining I=5±0.5 one should diagnose high-degree ischemic lesion of brain stem, at values of I=1±0.2 - average-degree ischemic lesion of brain stem; at I=0.5±0.1 - light-degree brain stem ischemia, at negative I values ischemic lesion of brain stem is inconsiderable. The innovation enables to increase significance of diagnostics due to combined analysis of factors that characterize ischemic lesion of brain stem.

EFFECT: higher accuracy of diagnostics.

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