Linna test

The Liner test compares an examination of the ipsilateral air conduction and bone conduction. Take the C256 tuning fork, shake it and place it in the mastoid sinus area to measure the bone conduction hearing. When the sound is not heard, record the time. Immediately move the tuning fork 1cm outside the external ear canal and measure the air conduction hearing. If the sound is still heard, it means that the air conduction is longer than the bone conduction time (AC>BC), and the Linna test is positive (RT “+”). On the contrary, the bone conduction time is longer than the air conduction time (BC>AC), and the Linna test is negative (RT "-"). Basic Information Specialist classification: otolaryngology examination classification: physical examination Applicable gender: whether men and women apply fasting: not fasting Tips: Clean your ears and prevent hearing. Normal value The air conduction is greater than the bone conduction AC>BC or (+) normal. Clinical significance Abnormal result 1. The air conduction is greater than the bone conduction (but both are shortened) AC>BC or weak (+) sensorineural hearing loss. 2. The air conduction is smaller than the bone conduction AC<p>. 3. Air conduction is equal to bone conduction AC = BC or (±) mild conductivity 聋. Need to check patients with deafness. Low results may be diseases: deafness considerations Contraindications before inspection: Clean the ears and prevent hearing. Taboo when checking: 1. The environment needs to be quiet. 2. Select a method to hit the tuning fork and the tuning fork should be placed in the correct position. 3. Pay attention to the RT false negative: when the side is severely sensitive, when the test is invisible to the ear, and the bone conduction is audible, it is easy to mistake TR(-), actually it is the contralateral eavesdropping. "When the ear bone is guided by a sound greater than 10 dB of the hearing threshold of the ear, the sound wave can be transmitted from the ear through the skull to the contralateral ear, and the ear sounds, so in this case, A noise-induced noise disturbance should be added to the ear to prevent false negatives. Inspection process Press the bottom of the slammed tuning fork against the mastoid part of the ear to be inspected, and let the subject listen to 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 for about 1 cm. Its air conduction hearing. Not suitable for the crowd Not suitable for checking the crowd: none.