Immune Deficiency and ENT Manifestations

Immune Deficiency & ENT - Deficiency Debrief

• Immunodeficiency: Immune system's compromised ability to fight infections and diseases.
• Types:
  • Primary (PID): Congenital, genetic defects (e.g., SCID, CVID, DiGeorge).
  • Secondary (SID): Acquired due to external factors (e.g., HIV, malnutrition, chemotherapy).
• ENT Manifestations: Recurrent/severe sinusitis, otitis media, pharyngitis/tonsillitis; oral candidiasis; unusual pathogens.

  ⭐ Selective IgA deficiency is the most common PID, often presenting with recurrent sinopulmonary and GI infections. ​

Immune Deficiency & ENT - PID ENT Parade

• PIDs: Hallmark is recurrent/severe ENT infections.
• Common Variable Immunodeficiency (CVID):
  • Recurrent sinopulmonary infections (sinusitis, otitis).
  • ↓ IgG; often ↓ IgA/IgM. Onset 2nd-3rd decade.
• Selective IgA Deficiency:
  • Most common PID.
  • Recurrent sinopulmonary infections, otitis.
  • ⚠️ Anaphylaxis risk with IgA-containing blood products.
• Severe Combined Immunodeficiency (SCID):
  • 📌 "Bubble Boy".
  • Severe, early infections (oral thrush, otitis, pneumonia).
  • Absent T-cells, ↓ B-cell function.
• DiGeorge Syndrome (22q11.2 Deletion):
  • CATCH-22: Cardiac, Abnormal facies, Thymic hypoplasia (T-cell defect → infections), Cleft palate, Hypocalcemia.
  • ENT: Cleft palate, recurrent otitis, Velopharyngeal Insufficiency (VPI).

  ⭐ Thymic hypoplasia in DiGeorge Syndrome impairs T-cell immunity, leading to recurrent infections like chronic rhinosinusitis and otitis media.

Immune Deficiency & ENT - SID ENT Scene

• Secondary Immunodeficiencies (SIDs): Acquired immune system compromise, more common than Primary Immunodeficiencies (PIDs).
• Key Causes:
  • HIV/AIDS: Oral hairy leukoplakia, Kaposi's sarcoma, persistent candidiasis.
  • Immunosuppressants: (e.g., post-transplant, chemotherapy) ↑ risk of opportunistic infections.
  • Malnutrition: Impaired cellular immunity, mucosal defense.
  • Diabetes Mellitus: Poorly controlled, ↑ risk of malignant otitis externa, invasive fungal sinusitis.
• Common ENT Manifestations: Recurrent/chronic sinusitis, otitis media, deep neck space infections, oral lesions.

  ⭐ Invasive fungal sinusitis (e.g., Mucormycosis, Aspergillosis) is a life-threatening emergency often seen in immunocompromised (especially diabetic ketoacidosis) patients.

Immune Deficiency & ENT - Immune Detective Work

• Suspect if: Recurrent/severe ENT infections (otitis, sinusitis), unusual pathogens, poor vaccine response, family history. 📌 SPUR: Severe, Persistent, Unusual, Recurrent.
• Initial Workup:
  • Complete Blood Count (CBC) with differential (lymphopenia, neutropenia)
  • Quantitative Immunoglobulins (IgG, IgA, IgM, IgE levels)
• Advanced Tests (if indicated):
  • Lymphocyte subset enumeration (CD3, CD4, CD8, CD19, CD56)
  • Complement assays (CH50, AP50)
  • Phagocytic function tests (e.g., NBT, DHR assay)

⭐ Bruton's Agammaglobulinemia (XLA) often presents with recurrent sinopulmonary infections due to markedly ↓ B cells & all Ig isotypes.

Immune Deficiency & ENT - ENT Immune Care

• Management: Aggressive, early treatment of ENT infections.
• Antimicrobials:
  • Prophylactic use common (e.g., neutropenia).
  • Broad-spectrum, then culture-guided.
• IVIG: For antibody deficiencies (CVID, XLA); dose 400-600 mg/kg q3-4wks.
• Surgery: High-risk; meticulous asepsis, consider perioperative antibiotics.
• Key Issues: Treat chronic sinusitis/otitis media promptly.

⭐ SCID: Live attenuated vaccines (MMR, Varicella) are contraindicated due to infection risk.

High-Yield Points - ⚡ Biggest Takeaways

• Recurrent sinopulmonary infections are a key indicator of Primary Immunodeficiencies (PIDs).
• Antibody deficiencies (CVID, XLA) often manifest as chronic otitis media and mastoiditis.
• T-cell defects (SCID, DiGeorge) may show oral candidiasis and absent tonsils/adenoids.
• Selective IgA deficiency, the most common PID, presents with recurrent sinopulmonary/GI infections.
• Chronic Granulomatous Disease (CGD) causes recurrent ENT abscesses and granulomas.
• Hyper IgE Syndrome (Job's) features "cold" abscesses, recurrent infections, and distinct facies.