Tuning fork inspection

The tuning fork test is the most commonly used method for identifying the nature of deafness. Common examination methods include Linna test, Weber test, Schwabach test, and tibial activity test. The Linna test is to press the bottom of the slammed tuning fork against the mastoid part of the ear to be examined, so that the subject can hear the sound of the vibration. When the sound is not heard, move the fork of the tuning fork to the same side of the external ear canal. The air conduction hearing was measured at 1 cm. Basic Information Specialist Category: Otolaryngology Examination Category: Other Inspections Applicable gender: whether men and women apply fasting: not fasting Analysis results: Below normal: Normal value: no Above normal: negative: If there is no change in pressure and decompression sound, it is negative (GT "-") Positive: When the pressure is reduced, the bone conduction is reduced, and the pressure is restored when the pressure is reduced, that is, the tibia activity test is positive (GT "+") Tips: Not suitable for the crowd: different nature of deafness on both sides. Normal value Hearing normal Linna test air conduction> bone conduction (+). Weber test is in the middle. The Schwabbaine test was normal (equal). Clinical significance The result of the abnormal result tuning fork check: 1 Conductive 聋: Linna test: air conduction <bone conduction (a) air conduction = bone conduction (+). Weber test: biased to the ear or heavier ears to the ear or lighter ears. Schwabbaine test: extended (+). 2 sensorineural hearing loss: Linna test: air conduction > bone conduction (both shorter than normal) (short +). Weber test: or lighter ears. Schwabbaine test: shortened (+). 3 mixed 聋: Linna test: (+), (-) or (±). Weber test: uncertain. Schwabbaine test: shortened (+). Need to check patients with deafness. Precautions Taboo before inspection: Wash your ears. Taboo when checking: 1 The environment needs to be quiet. 2 Select the tuning fork of the appropriate frequency. 3 Tap the tuning fork in a certain way. 4 The tuning fork is placed in the correct position during the test. 5 The fork of the tuning fork does not touch the fork, and the fork does not touch the hair. 6 Control ears must be normal, and the age of the controls should be comparable. 7 to prevent hearing fatigue. 8 Note that RT is false negative and weakly positive. Inspection process 1. Linna test is to press the bottom of the sounding fork to the mastoid part of the ear, let the subject listen to the vibration of the sound, when the sound is not heard, move the fork to the same side of the ear canal The air conduction hearing was measured at a mouth of about 1 cm. 2. The Weber test is to press the bottom of the slamming fork to any point on the midline of the skull, so that the subject can recognize that the ear is loud. 3. The Schwabach test is a separate test of both ears. The length of the bone conduction hearing time is alternately tested by alternately placing the sole of the slamming fork on the mastoid portion of the affected ear and the contrasting ear (normal ear). 4. The tibia activity test is to place the vibrating C256 tuning fork sole in the sinus sinus area, and simultaneously pressurize and decompress the outer ear canal with the ot air otoscope. If the sound is strong or weak, that is, when the pressure is bone conduction Reduced sensation, recovery when decompression, that is, positive tibia activity test (GT "+"), indicating normal tibia activity. If there is no change in the pressure and decompression sound, it is negative (GT "-"), which is a fixed sign of the humerus floor. Not suitable for the crowd Not suitable for the crowd: different nature of deafness on both sides.