Chronic Otitis Media

COM: Definition & Types - Ear's Unending Encore

• Persistent inflammation of middle ear cleft (≥ 3 months); chronic/recurrent mucopurulent discharge via tympanic membrane perforation.
• Two main types:
  • Tubotympanic (Safe/Mucosal COM): Central perforation, no cholesteatoma. Generally benign course.
  • Atticoantral (Unsafe/Squamous COM): Marginal/attic perforation, often with cholesteatoma. Higher complication risk.

⭐ Atticoantral disease (unsafe COM) is characterized by the presence of cholesteatoma and carries a higher risk of complications.
📌 Safe = Superior/central perforation; Unsafe = Upper/attic/marginal perforation (cholesteatoma risk).

COM: Pathophysiology & Bugs - The Bug Culprits

• Pathophysiology: Eustachian tube dysfunction (ETD), persistent tympanic membrane (TM) perforation, and recurrent infections leading to chronic mucosal inflammation.
• Aerobic Bacteria:
  • Pseudomonas aeruginosa (most common)
  • Staphylococcus aureus
  • Proteus mirabilis
  • Klebsiella pneumoniae
• Anaerobic Bacteria:
  • Bacteroides spp.
  • Peptostreptococcus spp.
• Fungal (less common): Aspergillus, Candida.

⭐ Pseudomonas aeruginosa is the most common aerobic bacterium isolated in active chronic suppurative otitis media (CSOM).

COM: Clinical Features - Whispers of Woe

• Tubotympanic (Safe COM / Mucosal):
  • Discharge: Profuse, mucoid/mucopurulent, odorless, intermittent.
  • Hearing Loss: Conductive, mild to moderate.
  • Perforation: Central, in pars tensa.
• Atticoantral (Unsafe COM / Squamous / Cholesteatoma):
  • Discharge: Scanty, purulent, persistent, characteristically foul-smelling.
  • Hearing Loss: Conductive or mixed, often progressive.
  • Perforation: Marginal, attic, or posterosuperior.
  • Pain: Usually absent; presence suggests complication.

⭐ Painless, scanty, foul-smelling ear discharge, often blood-tinged, is highly suggestive of cholesteatoma (unsafe COM).

COM: Investigations - Unmasking the Issue

• Otoscopy/Microscopy: Visualizes tympanic membrane perforation, discharge, granulations, or cholesteatoma.
• Audiometry (PTA): Quantifies hearing loss (typically conductive); establishes air-bone gap.
• Culture & Sensitivity: For active discharge; guides targeted antibiotic therapy.
• Imaging:
  • X-ray Mastoids (Schuller’s view): Limited; may show sclerosis, reduced pneumatization.
  • HRCT Temporal Bone: Assesses cholesteatoma extent, bony erosion, ossicular chain integrity.

⭐ High-Resolution Computed Tomography (HRCT) of the temporal bone is the imaging modality of choice to assess the extent of cholesteatoma and bony erosion.

COM: Complications - Complication Cascade

Untreated/aggressive Chronic Otitis Media (COM), especially unsafe atticoantral type with cholesteatoma, can lead to severe complications through various pathways.

⭐ Meningitis is the most common intracranial complication of chronic otitis media.

COM: Management - Mending the Drum

Aims: Disease eradication, complication prevention, hearing restoration.

Medical:

• Aural toilet (suction).
• Topical antibiotic/steroid drops (active discharge).
• Systemic antibiotics (exacerbations).
• Water precautions.

Surgical:

• Myringoplasty: TM repair.
• Tympanoplasty: TM + ossicular repair.
• Mastoidectomy:
  • Canal Wall Up (CWU): For limited disease.
  • Canal Wall Down (CWD): For extensive disease.

⭐ Canal Wall Down (CWD) mastoidectomy (e.g., Modified Radical Mastoidectomy) is preferred for extensive cholesteatoma to create a safe, exteriorized cavity.

High‑Yield Points - ⚡ Biggest Takeaways

• COM: Middle ear inflammation > 3 months with TM perforation & otorrhea.
• Types: Tubotympanic (safe, mucosal) vs. Atticoantral (unsafe, squamosal, cholesteatoma).
• Cholesteatoma: Keratin debris in middle ear, causes bone erosion, signifies unsafe ear.
• Commonest organism in active CSOM: Pseudomonas aeruginosa.
• HRCT temporal bone: Gold standard for cholesteatoma assessment.
• Key complications: Mastoiditis, facial palsy, labyrinthitis, intracranial abscesses.
• Treatment: Aural toilet, antibiotics, and surgery (tympanomastoidectomy).