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Sudden deafness following chromic acid application to a perforation of the tympanic membrane.

It is current practice in the treatment of many ear diseases to instil locally into the ear potentially ototoxic agents. It is now becoming increasingly clear that some of these agents may pass from the middle to the inner ear despite the presence of intact labyrinthine windows and hence produce deafness. This paper reports a case of severe sensorineural deafness which developed following the application of chromic acid to a perforation of the tympanic membrane--a hitherto unrecognized complication. Therefore, the risks outlined above should be carefully considered prior to local therapy with any such agents and they should be applied with extreme caution.

Adult↗

Early repair of blast ruptures of the tympanic membrane.

A method and results of early repair of blast rupture of the tympanic membrane in 24 selected cases, where flaps and/or free edges of the torn eardrum could be detected by examination with the operating microscope, are presented. By reversion of the flaps and approximation of the edges, the perforation was closed or significantly diminished. This ensured the healing of the tympanic membrane in all cases within days instead of months. No complications were noted during a subsequent two to three-years' follow-up. The improved hearing was stable.

Adolescent↗

Tympanic membrane grafting with fascia, pericardium and vein.

Fascia and preserved homologous vein and pericardium have been used in consecutive order in 250 ear operations. Though successful closure of the defect, in cases with chronic ear infection, tended to be better with pericardium, auditory gain with pericardium seemed to be less than with fascia and vein. The differences, however, were not statistically significant. For the reason that it is easier to obtain, vein is the graft of choice in our institution when homologous graft is needed.

Cholesteatoma↗

Anatomy of the temporalis fascia.

The anatomy of the different layers of the temporalis fascia is reviewed. The superficial and deep layers of the temporalis fascia have been studied by light microscopy to assess any histological difference between the two. We have also assessed the physical characteristics of the different layers by measuring their Young's modulus in the wet and dry states. Anatomically the superficial layer is part of the epicranial aponeurosis and thus covers nearly the entire lateral aspect of the skull. The deep temporal fascial layer covers exactly the temporalis muscle and measures 10 x 12 cm. The fascial layers have a separate arterial and venous supply enabling them to be used as a homograft, a rotation flap or free microvascular flap. Histologically there is no difference between the two layers. A study of the physical characteristics of the two fascial layers using Young's modulus revealed no significant difference in elasticity between the two. The most significant factor affecting the elasticity was the state of hydration of the fascia.

Elasticity↗

Management of retraction pockets of the pars tensa.

A study of 73 patients with retraction pockets of the pars tensa (93 affected ears) has been carried out. Of these 32 per cent had otalgia and 31 per cent reported episodes of aural discharge. Adequate audiometric data was available on 75 ears. Mean air-bone gaps were calculated using 500 Hz, 1000 Hz, 2000 Hz and 4000 Hz. Thirty per cent of ears had air-bone gaps of less than 10 dB and in 93 per cent the air-bone gap was less than 30 dB. Air-bone gaps of more than 40 dB were found in seven per cent. Of this group, seven patients were selected for surgical treatment. In all cases the retraction pockets were elevated and averted. In six cases, the thinned tympanic membrane was reinforced with a composite graft of cartilage and perichondrium. This technique has also been used in three patients not included in this study group. An ossiculoplasty was performed in four cases. In the early months, the retraction pockets remained completely everted. However, by 12 months some degree of retraction had recurred in four of the six patients who have been followed for more than 12 months.

Adolescent↗

Malleomyringoplasty using a silicone prosthesis.

Successful replacement of the sound conducting mechanism of the ear has been hampered by infection, perforation, prosthesis instability and extrusion. In this animal study on thirty rats a silicone prosthesis was inserted between two layers of fascia as a total replacement of the tympanic membrane and ossicular chain. After four months the graft was found to be intact without evidence of infection or extrusion in all but one of the 30 rats. These results justify a trial of a similar silicone prosthesis in humans.

Animals↗

Toynbee Memorial Lecture 1992: facts and fantasies in modern otology: the ear doctor's dilemma.

Until it is accepted that many of the recommendations for surgical treatment of middle ear disease, based on impressions formed twenty years ago, are misleading, attempts to rationalize the use of hospital resources will be little more than cosmesis. Responsibility for the initiation of cost-effective reform is primarily that of surgeons and requires urgent self-audit and the provision of realistic advice to patients (and administrators) as to what benefits microsurgery of the ear can offer.

Adenoidectomy↗

Closure of tympanic membrane perforation after the removal of Goode-type tympanostomy tubes: the use of silastic sheeting.

The reported incidence of persistent tympanic membrane perforation after the extrusion or removal of Goode-type tympanostomy tubes varies from 3 per cent to 47.5 per cent. A prospective randomized study of 152 Goode-type T-tube removals is presented. In one group of 79 ears, the edge of the defect was just freshened, but in the other 73 ears, the edge was freshened and a small piece of 0.13 mm silastic sheeting placed over the defect. Follow-up was performed at six weeks and three, six and nine months and shows that the use of silastic sheeting increases the rate of closure of the perforation and also significantly decreases the number of persistent perforations at nine months.

Child↗

Xenograft versus autograft in tympanoplasty.

This retrospective study compares the tympanoplasty success rate when using a xenograft (Zenoderm) or an autograft (temporalis fascia). Fifty-three ears were operated on over a three-year period. All the tympanoplasty operations were performed by the same surgeon. There were 43 ears in the temporalis fascia autograft group and 10 ears in the Zenoderm xenograft group. Both groups were similar with respect to patient age, type of tympanoplasty, area of tympanic membrane perforation and condition of the contralateral ear. The tympanoplasty success rate in the temporalis fascia autograft group was 95 per cent. The tympanoplasty success rate in the Zenoderm xenograft group was only 40 per cent. All Zenoderm tympanoplasty failures were regrafted with temporalis fascia autograft. There was a 100 per cent success rate with this salvage surgery. In conclusion, we suggest that Zenoderm is not a suitable graft material for tympanoplasty.

Adult↗