Орта құлақтың хирургиялық емi: Стапедэктомия және стапедотомия

Surgical procedure of the middle ear
Stapedectomy is a surgical procedure in which the stapes bone is removed from the middle ear and replaced with a prosthesis. If the stapes footplate is fixed in position, rather than being normally mobile, the result is a conductive hearing loss. There are two major causes of stapes fixation. The first is a disease process of abnormal mineralization of the temporal bone called otosclerosis. The second is a congenital malformation of the stapes. In both of these situations, it is possible to improve hearing by removing the stapes bone and replacing it with a micro prosthesis – creating a small hole in the fixed stapes footplate and inserting a tiny, piston like prosthesis. The results of this surgery are generally most reliable in patients whose stapes has lost mobility because of otosclerosis. Nine out of ten patients who undergo the procedure will come out with significantly improved hearing while less than 1% will experience worsened hearing acuity or deafness. Successful surgery usually provides an increase in hearing acuity of about 20 dB. However, most of the published results of success fall within the speech frequency of 500 Hz, 1000 Hz and 2000 Hz; poorer results are typically obtained in the high frequencies, but these are normally less hampered by otosclerosis in the first place.

Stapedectomy has success rates ranging from 80% to 95%.

A modified stapes operation, called a stapedotomy, is thought by many otologic surgeons to be safer and reduce the chances of postoperative complications. In stapedotomy, instead of removing the whole stapes footplate, a tiny hole is made in the footplate – either with a microdrill or with a laser, and a prosthesis is placed to touch this area, oval window. This procedure can be further improved by the use of a tissue graft seal of the fenestra, which is now common practice. Laser stapedotomy is a well established surgical technique for treating conductive hearing loss due to otosclerosis. The procedure creates a tiny opening in the stapes (the smallest bone in the human body) in which to secure a prosthetic. The CO2 laser allows the surgeon to create very small, precisely placed holes without increasing the temperature of the inner ear fluid by more than one degree, whilst decreasing the risk of footplate fracture, making this an extremely safe surgical solution. The hole diameter can be predetermined according to the prosthesis diameter. Treatment can be completed in a single operation visit using anesthesia, normally followed by one or two nights' hospitalization with subsequent at home recovery time a matter of days or weeks.

Comparisons have shown stapedotomy to yield either as good or better results than stapedectomy (measured by hearing improvement and reduction in the air bone hearing gap, and especially at higher sound frequencies), and to be less prone to complications. In particular, stapedotomy procedure greatly reduces the chance of a perilymph fistula (leakage of cochlear fluid).

In 1999, Professor Tarabichi described his experience with stapedotomy performed using the endoscope without the need for bone removal or skin incision (endaural approach). Since then, endoscopic stapedotomy has been gaining popularity especially amongst younger endoscopically trained surgerons. It allows for better view of the footplate of the stapes without the need to remove bone which is very common when doing the procedure with microscope. Professor Patel and his Australian team published a relatively large cohort of patients undergoing endoscopic stapedotomy procesure with closure of air bone gape within 20 dB in 98.6%.

The world's first stapedectomy is credited to Dr. John J. Shea Jr. who performed it in May 1956 on a 54 year old housewife who could no longer hear even with a hearing aid. Significant contributions to modern stapedectomy techniques were then made by the late Dr. Antonio De La Cruz of the House Ear Institute in Los Angeles; by the late Professor Henri André Martin of the Hôpital Edouard Herriot in Lyon, France, including calibrated platinotomy (stapes footplate rather than whole surgery) and trans footplate piston surgery that also paved the way for modern stapedotomy; and by the late Dr. Jean René Causse of the eponymous clinic in Béziers, France, who pioneered the use of Teflon piston prostheses (also critical progress for stapedotomy) and, with his late son Dr. Jean Bernard Causse, the reattachment of the stapedius muscle alongside the use of veinous grafts. in 1999, Professor Tarabichi of the Tarabichi Stammberger Ear and Sinus Institute, reported his experience performing the surgery using endoscope which lessens the need to remove bone to obtain access to the stapes.