NHĨ LƯỢNG BĂNG RỘNG

Abstract

Classical tympanometry with a 226 Hz transducer has some defects and limitations because the imaging is not completely accurate of the middle ear condition and the tympanic signs are very confusing. In many cases during middle ear surgery, middle ear pathology is very different from the signs on the tympanogram, this is due to the use of a 226 Hz probe based on physical features. A 226 Hz eardrum with a prognosis of middle ear secretions in children is quite poor and can be wrong in up to 50% of cases, and the diagnosis of subchain disruption in type A is only accurate in about 40% of cases. In most cases of otosclerosis, despite middle ear stiffness, classic tympanic signs show normal compliance, which is the opposite of middle ear stiffness. Basic tympanometry identifies common middle ear pathologies such as middle ear discharge, ossicle disruption, and otosclerosis, however, if these cases are poorly diagnosed, then the objectivity of the test is not effective. very poor experience. Classical tympanometry has many limitations and errors, so the newer method used in conjunction with classical tympanometry is the wideband tympanic type, also known as 3D tympanometry. The advantage of this tympanic system is that it uses multiple frequencies (wideband) at the same time to represent the middle ear condition, so it has many clinical applications, most of the classic tympanic defects are 3D tympanic. Adequate complementarity as well as diagnostic reliability are also greatly improved and are often assessed by the absorption of energy of the middle ear system.