METHOD OF DIFFERENTIAL DIAGNOSTICS OF PROFESSIONAL SENSORINEURAL DEAFNESS FROM SENSORINEURAL DEAFNESS OF NON-PROFESSIONAL GENESIS Russian patent published in 2009 - IPC A61B5/476 A61B5/484 A61B5/488 

FIELD: medicine.

SUBSTANCE: invention relates to field of medicine, namely, to otolaryngology and professional pathology. Electroencephalography (EEG) with registration of long-latent acoustic induced potentials (LAIP), electroneuromyography (ENMG), algesimetry are performed and diagnostic coefficients F₁ and F₂ are calculated by formulas F₁=-5.00-2.97·A,+5.67·A₂-0.69·A₃+1.52·A₄+1.19·A₅-0.99·A₆-2.6··A₇+3.21·A₈-2.13·A₉+0.98·A₁₀-1.97·A₁₁-3.59·A₁₂; F₂=-14.61+8.55-A₁-6.67·A₂+3.01·A₃-2.16·A₄-1.96·A₅+3.09·A₆+2.06··A₇-4.3·A₈+3.44·A₉-1.7-A₁₀+2.86·A₁₁+2.43·A₁₂, where F₁ - diagnostic coefficient for professional sensorineural deafness, F₂ - diagnostic coefficient for sensorineural deafness of non-professional character; -5.00 and -14.61 - constants, 2.97; 5.67; 0.69; 1.52; 1.19; 0.99; 2.6; 3.21; 2.13; 0.98; 1.97; 3.59; 8.55; 6.67; 3.01; 2.16; 1.96; 3.09; 2.06; 4.3; 3.44; 1.7; 2.86; 2.43 - discriminatory coefficients; A₁ - motor rate in distal part of tibial nerve in m/sec; A₂ - index of algesimetry on second phalanx of second finger of right hand in mm; A₃ -sensory rate in distal part of tibial nerve in m/sec; A₄ - index of latency P1 of LAIP in left temporal led in msec; A₅ - index of between-peak interval N 11-13 of "ССВП" in msec; A₆ - motor rate on section wrist-elbow of median nerve in m/sec; A₇ - index of amplitude P1N1 of LAIP in left temporal lead in mcV; A₈ - index of latency N2 of LAIP in right temporal lead in msec; A₉ - index of latency of P2 of LAIP in right temporal lead in msec; A₁₀ - presence of irritative changes on EEG, absent - 1, present - 0; A₁₁ - sensory rate on ulner nerve in msec; A₁₂ - index of residual latency of median nerve in msec. If value F₁ is larger or equal F_2, professional sensoruneural deafness is diagnosed, if F₁ is less than F₂, sensoruneural deafness of non-professional genesis is diagnosed.

EFFECT: increase of reliability of differential diagnostics, which is achieved due to examination of whole sensorineural complex.

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