CSOM

Chronic suppurative otitis media Dr. T. Balasubramanian M.S. D.L.O.

Definition CSOM is defined as a chronic infection of middle ear mucosa lining the middle ear cleft The duration of infection should be more than 3 weeks Middle ear cleft includes eustachean tube, middle ear proper and mastoid air cell system

Tubotympanic disease Also known as safe ear It does not cause any serious complications Infection limited to the antero inferior part of middle ear cleft Associated with central perforation

Why is Tubotympanic disease safe? There is no risk of bone erosion Not known to cause intracranial complications Discharge from middle ear flows freely through the perforation in the pars tensa Usually the perforation of pars tensa is surrounded by a rim of intact drum The annulus is intact in all these cases

Aetiology Inadequately treated ASOM ASOM causing persistent perforation (Persistent perforation syndrome) Presence of focal sepsis in Nose / throat causing EC Infected traumatic central perforation

Microbiology Gram negative bacilli has been commonly isolated Ps. aeruginosa, E. coli, and B. proteus These organisms are not commonly found in the respiratory tract These organisms are commonly found in the skin of external canal Always number your slides

Clinical features Discharge is profuse and Mucopurulent It is not foul smelling Since the infected area is open at both ends discharge doesn't accumulate in the middle ear cavity Ossicular chain is mostly uninvolved Pts have conductive deafness – 30 – 40 dB Pain is usually due to otitis externa

Stages of Tubotympanic disease Acute stage Inactive stage Quiescent stage Healed stage

Acute stage Ear is actively discharging Middle ear mucosa hypertrophied and congested The ear discharge is Mucopurulent Discharge is not foul smelling

Inactive stage Dry perforation of ear drum + Perforation involves the pars tensa Annulus is intact Middle ear mucosa is normal and healthy

Quiescent stage Perforation of ear drum present Middle ear is dry Middle ear mucosa may be normal / hypertrophied Discharge stopped just a few days back

Healed stage Healing of drum by thin scar Tympanosclerotic patches may be seen Ossicular chain invariably intact

Tuning fork tests Rinne negative on the affected side Weber lateralized to deaf ear ABC - Not reduced

Pure tone audiometry Shows conductive hearing loss Hearing loss commonly ranges between 30 - 40 dB If hearing loss exceeds 60 dB then ossicular chain disruption should be suspected Associated sensorineural loss should arouse suspicion of toxic deafness

Conservative management Aural toileting - in active disease Suction clearance Syringing of affected ear using warm saline mixed with 1.5 % acetic acid Topical antibiotics administered after culture report becomes available Ear drops is administered by displacement method

Role of systemic drugs Antibiotics Antihistamines Ototoxic drugs to be avoided Nasal decongestants ? Rhinitis medicamentosa

Precautions The ear must be kept dry Pre-existing sinus infections to be treated aggressively Presence of focal sepsis in the throat should also be managed

Surgical management Surgery towards eradication of focal sepsis Surgery aimed towards eradication of middle ear disease (Mastoidectomy) Surgery aimed at reconstruction of sound conduction mechanism (Myringoplasty and tympanoplasty)

Tympanoplasty Tympanoplasty is defined as the surgical procedure which enables reconstruction of middle ear cavity and ossicular system. It also involves reconstruction of the perforated ear drum

Components of tympanoplasty Canalplasty Meatoplasty Myringoplasty Ossiculoplasty

Canalplasty This procedure is used to widen the external canal Should be performed before grafting anterior perforations This procedure facilitates better healing External canal can be cleansed without any difficulty Useful when performing second stage ossiculoplasty

Meatoplasty This procedure is performed to enlarge the lateral cartilagenous portion of the external canal This enlargement should be in proportion to the size of the bony portion of the external canal

Ossiculoplasty Used to reconstruct the damaged ossicles of middle ear cavity Long process of incus is found to be commonly eroded TORP PORP

Aims of tympanoplasty Disease eradication Restoration of middle ear aeration Reconstruction of sound conduction mechanism Creation of self cleansing dry cavity

Preop investigations Tubal function tests Audiometric evaluation X-ray / CT scan of temporal bones Tests for anesthetic fitness

Trans canal surgical approach Performed through ear speculum inserted into the ear canal Ear canal should be wide There should not be any bony overhang obscuring the edges of perforation

End aural approach Incision is made between tragus and helix End aural speculum is used Posterior bony overhang can easily be drilled out Better for anterior visualization of the ear drum

Post aural approach Used in cases of narrow external canal Used to close anterior ear drum perforations William Wild’s post aural incision is used

Ideal Tympanic membrane grafts Temporalis fascia Dura Periosteum

Why temporalis fascia is favoured? It has a low basal metabolic rate Its thickness more or less resembles that of normal ear drum It can be harvested through the same post aural incision It is available in plenty It has a good take rate

Types of grafting techniques Overlay technique Underlay technique Interlay technique

Underlay technique Commonly used technique The graft is placed under the tympanic membrane remnant and bone To facilitate this process a tympanomeatal flap will have to be elevated

Overlay technique The graft is placed over the bony tympanic sulcus A bony ledge is created for this purpose if the sulcus is absent The overlaid graft is supported by the remnant ear drum if present

CSOM

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CSOM