Pediatric Sinusitis

Pediatric Sinusitis - Little Noses, Big Woes

• Inflammation of paranasal sinuses in children < 15 yrs.
• Unique Aspects:
  • Ethmoid & maxillary sinuses present at birth; sphenoid by 5 yrs, frontal by 7-8 yrs.
  • Immature immune system.
  • Shorter, wider Eustachian tubes (↑risk of AOM co-occurrence).
• Pathogens: Viral (most common); S. pneumoniae, H. influenzae, M. catarrhalis (bacterial).
• Predisposing Factors: URI, allergic rhinitis, adenoid hypertrophy, GORD, ciliary dyskinesia, immunodeficiency, daycare.

  ⭐ Recurrent acute rhinosinusitis (RARS) is defined as ≥ 4 episodes/year with symptom resolution between episodes.

Pediatric Sinusitis - Symptom Spotting & Timelines

• Key Persistent Symptoms (>10 days without improvement):
  • Nasal discharge (any quality)
  • Cough (daytime and/or nighttime)
• Severe Onset Symptoms (Bacterial Indication):
  • Fever ≥39°C (concurrent)
  • Purulent nasal discharge
  • For ≥3 consecutive days
• Other Common Signs:
  • Younger children: Irritability, poor feeding.
  • Older children: Facial pain/pressure, headache, halitosis.
• Temporal Classification:
  • Acute Rhinosinusitis (ARS): Symptoms <4 weeks, full resolution.
  • Subacute Rhinosinusitis: 4-12 weeks, full resolution.
  • Chronic Rhinosinusitis (CRS): Symptoms ≥12 weeks, no full resolution.
  • Recurrent Acute Rhinosinusitis (RARS): ≥4 episodes/year, with interim resolution.

⭐ Viral URI is the most common predisposing factor for acute bacterial sinusitis in children.

Pediatric Sinusitis - Diagnostic Clues Unveiled

• Primarily clinical diagnosis based on specific criteria:
  • Persistent illness: Nasal discharge (any type) AND/OR daytime cough for >10 days without improvement.
  • Severe onset: Concurrent fever ≥39°C AND purulent nasal discharge for at least 3-4 consecutive days.
  • Worsening course ("double sickening"): New onset fever, headache, or ↑ nasal discharge after initial improvement.
• Imaging (CT scan preferred over X-ray):
  • Indicated for suspected orbital or intracranial complications.
  • Evaluation of chronic or recurrent sinusitis unresponsive to medical therapy.
  • Pre-operative planning for functional endoscopic sinus surgery (FESS).
• Nasal endoscopy: Useful to visualize purulent discharge from middle meatus, polyps, or anatomical obstruction.

⭐ CT scan is the gold standard imaging modality for assessing complicated or chronic pediatric sinusitis and prior to surgical intervention.

Pediatric Sinusitis - Treatment Blueprints

• Acute Bacterial Rhinosinusitis (ABRS):
  • First-line: Amoxicillin or Amoxicillin-clavulanate (90 mg/kg/day amoxicillin component). Duration: 10-14 days.
  • Severe/No response (48-72h): High-dose Amox-Clav, IV Cephalosporins (e.g., Ceftriaxone).
• Adjunctive Therapy:
  • Nasal saline irrigation.
  • Intranasal corticosteroids (especially if allergic component).
  • Analgesics/antipyretics.
• Chronic Rhinosinusitis (CRS) / Recurrent ARS:
  • Medical: Prolonged antibiotics (3-6 weeks), nasal steroids, saline irrigation.
  • Surgical:
    • Adenoidectomy (first-line for children <6 years or with significant adenoid hypertrophy).
    • Functional Endoscopic Sinus Surgery (FESS) for failed medical/adenoidectomy or older children.

⭐ Adenoidectomy is often the first-line surgical treatment for chronic rhinosinusitis in children <6 years, especially with adenoid hypertrophy, before considering FESS.

Pediatric Sinusitis - Complication Watchlist

• Orbital (Chandler Classification):
  • Group I: Preseptal cellulitis (Inflammatory edema)
  • Group II: Orbital cellulitis
  • Group III: Subperiosteal abscess
  • Group IV: Orbital abscess
  • Group V: Cavernous sinus thrombosis
• Intracranial:
  • Meningitis
  • Epidural abscess
  • Subdural empyema
  • Brain abscess
  • Dural sinus thrombosis
• Bony: Osteomyelitis (Pott's puffy tumor - frontal sinus)

⭐ Preseptal cellulitis is the most common orbital complication of acute sinusitis in children. Urgent ophthalmology & ENT consult if suspected orbital/intracranial spread.

High‑Yield Points - ⚡ Biggest Takeaways

• Viral URIs are the primary trigger for acute bacterial sinusitis in children.
• Maxillary and ethmoid sinuses are most commonly involved due to their early development.
• Diagnosis: Persistent symptoms >10 days, severe onset, or biphasic (worsening) illness.
• Key pathogens: Streptococcus pneumoniae, non-typable Haemophilus influenzae, Moraxella catarrhalis.
• First-line antibiotic: Amoxicillin or Amoxicillin-clavulanate.
• Orbital complications like cellulitis or abscess are the most serious.
• Chronic pediatric sinusitis is defined by symptoms lasting >12 weeks.