fistula test

The fistula test is used for those who are suspected of having a lost fistula. When the bone fan is routed to the lesion, the pressure or decompression of the external auditory canal can affect the labyrinth and cause the flow of the lymphatic fluid. Pressurize or decompress the external auditory canal. If the fistula is located at the back of the outer semicircular canal, the lymphatic fluid will flow to the ampulla of the ampulla during pressure, causing nystagmus to the ipsilateral side. When the decompression is performed, the flow of lymph fluid is away from the ampulla. Produces an nystagmus to the opposite side. If the fistula is located in front of the ampulla of the outer semicircular canal, such as the oval window, snail window or drumstick, the opposite is true. Basic Information Specialist classification: otolaryngology examination classification: body fluid examination Applicable gender: whether men and women apply fasting: not fasting Tips: Taboo strenuous exercise. Normal value No eyeball deflection and nystagmus, no vertigo. Clinical significance Abnormal result 1. Any eyeball deflection and nystagmus are strongly positive, indicating the presence of a lost fistula. 2, if there is no eyeball deflection and nystagmus, but only vertigo, is weakly positive, suspicious of fistula. Need to check the crowd has a lost fistula patient. Positive result may be disease: negative result of labyrinth concussion may be disease: dizziness precautions Taboo before inspection: 1. Taboo strenuous exercise. 2, forbidden to take nerve sedation or stimulant, alcoholic beverages 48 hours before the examination. Taboo when checking: 1. Choose a quiet environment to prevent the subject from being disturbed. 2. If the fistula test is negative, the presence of the fistula cannot be ruled out. Inspection process Pressurize or decompress the external auditory canal. If the fistula is located at the back of the outer semicircular canal, the lymphatic fluid will flow to the ampulla of the ampulla during pressure, causing nystagmus to the ipsilateral side. When the decompression is performed, the flow of lymph fluid is away from the ampulla. Produces an nystagmus to the opposite side. If the fistula is located in front of the ampulla of the outer semicircular canal, such as the oval window, snail window or drumstick, the opposite is true. Not suitable for the crowd Not suitable for the crowd: no.