Complications of Otitis Media

Overview & Mastoiditis - Spread & Swell

• OM Complications: Intratemporal (e.g., mastoiditis) & Intracranial (e.g., meningitis).
• Pathways of Spread (OM):
  • Direct bone erosion (mastoiditis commonest).
  • Thrombophlebitis.
  • Preformed pathways (round window, sutures).
• Mastoiditis: Most common OM complication. Mastoid air cell inflammation.
  • Acute Coalescent: Pus → bone resorption → cell coalescence → empyema.
  • Key Signs (Swell & Spread):
    • Postauricular pain, swelling, erythema. Pinna down & out.
    • Retroauricular sulcus obliteration ('ironed-out').
    • Sagging posterosuperior EAC wall (pathognomonic).
  • Subperiosteal Abscesses (Mastoid Spread):
    • Postauricular (commonest).
    • Bezold's (SCM).
    • Citelli's (digastric).
    • Luc's (EAC).

⭐ Sagging of posterosuperior meatal wall: highly suggestive of acute mastoiditis, indicates bony meatus periosteitis.

Other Intratemporal Complications - Inner Ear Invaders

• Labyrinthitis (Otogenic)

  • Invasion of inner ear by toxins or bacteria.
  • Types:
    • Serous/Toxic: Common. Toxins enter via round window. Vertigo, SNHL (often reversible).
    • Suppurative: Rare. Bacteria enter via oval/round window/cochlear aqueduct. Severe vertigo, profound irreversible SNHL, nystagmus. Medical emergency.
  • Symptoms: Vertigo, nausea, vomiting, hearing loss, tinnitus.
  • Fistula Test: Positive if erosion of bony labyrinth (e.g., cholesteatoma).

• Petrositis (Apical Petrositis)

  • Inflammation of petrous apex air cells.
  • Gradenigo's Syndrome Triad: 📌 (DREAM)
    • Discharge (otorrhea)
    • Retro-orbital pain (CN V involvement)
    • Eye (diplopia due to CN VI palsy)
    • AOM/CSOM history
    • Mastoiditis often co-exists
  • Diagnosis: CT scan essential.

• Facial Nerve (CN VII) Palsy

  • Can occur in AOM (more common in children, often due to dehiscence of Fallopian canal) or CSOM (cholesteatoma, granulation tissue).
  • AOM-related: Usually resolves with antibiotics; myringotomy +/- steroids.
  • CSOM-related: Often requires surgical decompression.

⭐ High-Yield Fact: In acute otitis media, facial palsy is usually due to inflammation and edema, not direct bony erosion, and often has a good prognosis with conservative treatment. In chronic suppurative otitis media, it's more often due to cholesteatoma eroding the Fallopian canal, requiring surgery.

Intracranial Complications I - Brain's Border Breached

• Meningitis: Most common intracranial complication.
  • Pathways: Hematogenous, direct extension (e.g., labyrinth, patent cochlear aqueduct).
  • CSF: ↑Protein, ↓Glucose, pleocytosis (neutrophilic).
  • Key Sx: Fever, headache, neck stiffness, altered sensorium.
• Extradural Abscess (EDA): Pus collection between dura & skull bone.
  • Cause: Bone erosion (e.g., from coalescent mastoiditis).
  • Common Sites: Middle cranial fossa (most common), posterior fossa (via Trautmann’s triangle).
  • Sx: Often insidious; persistent headache, fever, localized tenderness.

Intracranial Complications II & Management - Deep Trouble & Defense

• Brain Abscess:
  • Most common: Temporal lobe, then cerebellum.
  • CT/MRI: Ring-enhancing lesion.
• Lateral Sinus Thrombophlebitis (LST):
  • Picket fence fever (septicemia).
  • Griesinger's sign: Mastoid edema.
  • CECT: Empty delta sign. MRV confirms.
• Otitic Hydrocephalus (Benign Intracranial Hypertension):
  • ↑ ICP, normal CSF & ventricles.
  • Headache, papilledema, VI nerve palsy.
• Diagnosis:
  • CECT initial; MRI (with MRV/MRA) gold standard.
  • LP: Only after imaging rules out mass effect.
• Management:
  • High-dose IV antibiotics (broad-spectrum, good BBB penetration).
  • Surgical source control (e.g., mastoidectomy for CSOM).
  • Brain abscess: Neurosurgical drainage.
  • LST: Anticoagulation (case-by-case), possible thrombectomy.
  • Otitic Hydrocephalus: Acetazolamide, therapeutic LPs, V-P shunt if refractory.

⭐ Temporal lobe is the most common site for an otogenic brain abscess.

High‑Yield Points - ⚡ Biggest Takeaways

• Meningitis is the most common intracranial complication of otitis media.
• Acute mastoiditis is the most common extracranial complication.
• Gradenigo's syndrome triad: otorrhea, retro-orbital pain (CN V), and abducens palsy (CN VI).
• Bezold's abscess involves pus deep to the sternocleidomastoid muscle.
• Lateral sinus thrombophlebitis presents with picket-fence fever and Griesinger's sign.
• Otitic hydrocephalus features raised ICP with normal CSF findings.
• Facial nerve palsy can complicate both acute and chronic OM.