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Immunodeficiency | 마이메르시 MyMerci
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Immunodeficiency

NCLEX Review Guide: Adult Health - Immune System Immunodeficiency

Primary Immunodeficiency Disorders

Common Variable Immunodeficiency (CVID)

  • Most common primary immunodeficiency in adults, characterized by decreased antibody production and recurrent bacterial infections of respiratory and GI tracts.
  • Patients present with chronic sinusitis, pneumonia, and increased risk of autoimmune disorders and malignancies.

Selective IgA Deficiency

  • Most common primary immunodeficiency overall, with IgA levels less than 7 mg/dL in presence of normal IgG and IgM levels.
  • Critical Alert: Patients are at risk for anaphylactic reactions to blood products containing IgA - always use washed RBCs or IgA-deficient blood products.

Key Points

  • Primary immunodeficiencies are genetic disorders present from birth but may manifest in adulthood
  • Recurrent infections with encapsulated bacteria (Streptococcus, Haemophilus) are hallmark signs
  • IVIG therapy is mainstay treatment for antibody deficiencies

Secondary Immunodeficiency

HIV/AIDS

  • CD4+ T-cell count below 200 cells/μL or presence of AIDS-defining opportunistic infections indicates progression to AIDS.
  • Opportunistic infections include Pneumocystis jirovecii pneumonia (PCP), Candida esophagitis, CMV retinitis, and Kaposi's sarcoma.

Clinical Scenario

A 35-year-old patient with HIV presents with dry cough, dyspnea, and fever. CXR shows bilateral interstitial infiltrates. Most likely diagnosis is PCP pneumonia. First-line treatment is trimethoprim-sulfamethoxazole (Bactrim).

Medication-Induced Immunosuppression

  • Corticosteroids suppress both cellular and humoral immunity, increasing infection risk with prolonged use above physiologic doses.
  • Chemotherapy agents cause neutropenia (ANC < 1000), requiring protective precautions and monitoring for signs of infection.

Key Points

  • Secondary immunodeficiency is more common than primary and results from external factors
  • Neutropenic precautions include private room, hand hygiene, avoiding fresh flowers/fruits
  • Monitor for subtle signs of infection as inflammatory response may be blunted

Nursing Management

Infection Prevention

  1. Implement strict hand hygiene protocols for patient, family, and healthcare workers
  2. Place patient in protective isolation if neutropenic (ANC < 500)
  3. Screen visitors for signs of illness before allowing contact
  4. Avoid invasive procedures when possible; use aseptic technique when necessary
  5. Monitor vital signs frequently for early detection of infection

Memory Aid: SHIELD

  • Sterile technique
  • Hand hygiene
  • Isolation precautions
  • Early detection of infection
  • Limit invasive procedures
  • Daily assessment

Patient Education

  • Teach patients to avoid crowds, sick contacts, and activities with high infection risk such as gardening without gloves or cleaning cat litter boxes.
  • Emphasize importance of completing prescribed antibiotic courses even if symptoms improve to prevent resistance.

Key Points

  • Prevention is the primary nursing focus for immunocompromised patients
  • Early recognition of infection signs prevents complications
  • Patient education empowers self-care and reduces readmissions

Commonly Confused Concepts

Primary Immunodeficiency Secondary Immunodeficiency
Genetic/congenital origin Acquired from external factors
Present from birth (may manifest later) Develops after normal immune function
Examples: CVID, IgA deficiency Examples: HIV, chemotherapy
Often requires lifelong treatment May be reversible if cause removed

Quick Check: Neutropenia Levels

  • Normal ANC: >1500 cells/μL
  • Mild neutropenia: 1000-1500 cells/μL
  • Moderate neutropenia: 500-1000 cells/μL
  • Severe neutropenia: <500 cells/μL (high infection risk)

Study Tips & Memory Aids

Remember AIDS-Defining CD4 Count

"Below 200, AIDS is True" - CD4+ count below 200 cells/μL indicates AIDS progression

Common Pitfalls

  • Don't confuse neutropenia with thrombocytopenia - neutropenia increases infection risk, thrombocytopenia increases bleeding risk
  • Remember that fever may be absent in immunocompromised patients - look for subtle signs like confusion or tachycardia
  • IgA deficiency patients need special blood products - regular blood can cause anaphylaxis

Self-Assessment Checklist

  • ☐ Can I differentiate between primary and secondary immunodeficiency?
  • ☐ Do I know the critical CD4 count for AIDS diagnosis?
  • ☐ Can I list appropriate nursing interventions for neutropenic patients?
  • ☐ Do I understand the blood product precautions for IgA deficiency?
  • ☐ Can I identify early signs of infection in immunocompromised patients?

Remember: You're preparing to be a safe, competent nurse who protects vulnerable patients. Every concept you master brings you closer to providing excellent patient care. Keep pushing forward - you've got this! 🌟

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