A simple technique to close subtotal perforations of the tympanic membrane

Sylvester Valentine Fernandes BSc(Hons),MB,BS,MCPS,FRCSEd,FRACS,FACS,LLB Senior Surgeon & Senior Clinical Lecturer Newcastle University, Australia Email: [email protected]

Temporalis fascia technique

Disadvantages • Lifting of tympanomeatal flap • Bleeding may impair visualisation • Flap tears may occur • Packing may cause displacement of graft, unbeknown to surgeon • Postoperative care • Not suitable for very young children

Composite graft

Advantages • Available very locally • Minimal non visible scar • Has all the advantages of temporalis graft • Cartilage easy to handle, provides firm scaffolding and resistance from infection • Good fixation ensured • Occurrence of retraction pockets and chances of recurrent perforation reduced • No packing • Postoperative care minimal • Both ears can be done at the same time

CRITERIA

• Small to medium sized perforation (maximum one-half of tympanic membrane) • Nonmarginal perforation with clear view of margins • Dry ear and no granular myringitis • Conductive loss no greater than 35dB in any frequency • Atleast 12 months of clinical observation for non healing

Typical perforation

Tragal cartilage – Donor site

Circumperipher al separation of pericho ndrium from cartilage

In large r perforations use ref lect ed pe ri c h ondrim from other side

(inside

Tragal composite graft

Reflected perichondrium on one side

Perforation

De-epithelisation of perforation (postage stamp technique)

Composite graft laid with cartilage in middle ear

Flattened gellfoam laid on graft

Catgut stitch to donor site

Antibiotic ointment into external canal

6 month postoperative

18 month postoperative

RESULTS Average Preop A/B gap Average Postop A/B gap 500 Hz 13.7 dB 8.3 dB 1 kHz 12.3 dB 5.7 dB 2 kHz 5.3 dB 2.7 dB 4 kHz 19.7 dB 9.0 dB Average gain 500 Hz 5.3 dB 1 kHz 6.7 dB 2 kHz 2.7 dB 4 kHz 10.7 dB

Functional results

25 20 15 10 5 0 0.5

1

kHz

2 4 Preop A/B gap Postop A/B gap

Average Gain

12 10 8 6 4 2 0 5.3

0.5

6.7

1

KHz

2.7

2 10.7

4 Average A/B gap gain

Follow this sequence: 1. Inject tragus with vasoconstrictor/anaesthetic 2. Freshen perforation and prepare site 3. Take and prepare graft (cartilage can be thinned if required). Use ophthalmic instruments (if available) to separate the periphery of cartilage and perichondrium.

4. Place graft ( at this time the site of graft placement has stopped bleeding) Place cartilage in middle ear and perchondrium on to remnant tympanic membrane and place flattened gelfoam on graft 5. Place ointment in ear canal 6. Close donor site with (one) catgut stitch (no need for removal by doctor later as it falls off by itself) This way there is almost no bleeding to obscure vision!

Patient must be told of cartilage use and must be told to inform future health providers

Technique favourable in ……

•

Children

•

Revision surgery

•

Bilateral cases

•

Costs concerns and follow up difficult (missionary work)

•

Time concerns (takes < 30 minutes)

•

Neophyte surgeon (registrar training)

•

Infact …in all myringoplasty cases fulfilling criteria

REFERENCES Fernandes SV. Composite chondroperichondrial clip tympanoplasty: The triple “C” technique. Otolaryngol Head Neck Surg 2003;128: 267-72 Tos M. “Cartilage Tympanoplasty” 2009 George Thieme Verlag. Stuttgart.Chapter 26