METHOD OF AUDIOLOGICAL DIAGNOSTICS OF PERILYMPHATIC FISTULAS OF LABYRINTH IN SENSORINEURAL HEARING LOSS Russian patent published in 2017 - IPC A61B5/00 A61B5/12 

FIELD: medicine.

SUBSTANCE: identification of sound lateralisation is performed with fork tined placed on patient's forehead centre or bridge of nose by "pinch" method. Audiometric control of patient's hearing acuity is performed with determination of initial thresholds of patient's sound perception by air conductivity on the entire tone-scale. Audiometric control of patient's hearing acuity is performed with determination of initial thresholds of patient's sound perception by bone conductivity on the entire tone-scale. After that, patient presses their head to sternum maximally tightly and keeps their head in such position for 55-65 seconds to ensure partial compression of their neck veins and to increase tension of meninges. It is accompanied by 30-50 mm of water column increase of liquor pressure. Immediately in patient determined is fact of presence or absence of change of their thresholds of sound perception by air conductivity on tone-scale at different frequencies of sounding. After that, when patient is in horizontal position on their back with their head turned on healthy ear, acoustic duct of affected ear is filled with inert liquid which has temperature equal to temperature of patient's body. Thresholds of patient's hearing are re-determined by bone conductivity. If after pressing head to sternum thresholds of patient's sound perception by air conductivity increases by 10 dB and more at not less than two different frequencies of sounding with simultaneous absence of tuning-fork lateralisation of sound into healthy ear and if threshold of sound perception by bone conductivity reduces in patient by 10 dB and more on not less than two different frequencies of sounding after filling acoustic duct of affected ear with inert liquid, presence of perilymphatic fistula of labyrinth is diagnosed in patient.

EFFECT: method makes it possible to carry out reliable diagnostics of presence of perilymphatic fistulas of labyrinth independently on mechanism of their development, and reduce diagnostics time due to complex estimation of patient's sound perception by aie and bone conductivity.

3 ex