[Meatomyosynangiosis (Ugo Fisch operation) in progressive perceptive deafness. Principles, results and indications].

Meatomyosynangiosis is the operation suggested by Ugo Fisch. It consists of positioning a flap of superficial temporal muscle in contact with the osteoperiosteal and vasculo-neural elements of the internal auditory meatus. In about one third of the cases this operation results in tonal and vocal improvement for patients suffering from progressive perceptive deafness. According to Ugo Fisch, these results are due to retrograde revascularisation of the internal ear starting from the implanted muscular flap. Our own surgical experience confirms these clinical findings. The greatest chance of securing such an improvement is with young patients under fifty and results from this operation in other cases of perceptive deafness are definitely less conclusive and more uncertain. The main indication then for this meatomyosynangiosis is, at present, for progressive perceptive deafness in young patients with no more than 50 Db at lower frequencies. Furthermore, the arteriolar anastomosis pictures we have obtained after this operation was carried out on animals would appear to confirm the physiopathogenetic explanation suggested by Ugo Fisch.