HIV-Associated Opportunistic Infections -- Jackie Sherbuk, MD

The video discusses HIV-associated Opportunistic Infections (OIs) through a case-based approach, highlighting key infections, treatment methodologies, and the importance of antiretroviral therapy (ART) in managing these infections.

Key Scientific Concepts and Discoveries:

• Opportunistic Infections: Infections that occur more frequently and with greater severity in individuals with weakened immune systems, particularly those with HIV.
• CD4 Count and Viral Load: The relationship between CD4 counts and the risk of Opportunistic Infections, with a CD4 count below 200 significantly increasing the risk.
• Common Opportunistic Infections:
  • Pneumocystis jirovecii pneumonia (PJP)
  • Esophageal Candidiasis
  • Mycobacterium avium complex (MAC)
  • Tuberculosis (TB)
  • Cryptococcal Meningitis
  • Cytomegalovirus (CMV) retinitis
  • Progressive multifocal leukoencephalopathy (PML)

Treatment Methodologies:

• Primary and Secondary Prophylaxis:
  • Primary prophylaxis is aimed at preventing initial infections in individuals with CD4 counts below specific thresholds.
  • Secondary prophylaxis is used to prevent recurrent infections after an initial episode.
• ART Initiation Timing:
  • For most Opportunistic Infections, ART should begin within two weeks after treatment initiation.
  • Exceptions include Cryptococcal Meningitis and TB, where ART should be delayed for 4-6 weeks after starting treatment for the infection.

Case Discussions:

1. PJP: Most common opportunistic infection; treated with trimethoprim-sulfamethoxazole and steroids for severe cases.
2. Cryptococcal Meningitis: Diagnosed via lumbar puncture and treated with amphotericin B and flucytosine; ART should start after 4-6 weeks of treatment.
3. Esophageal Candidiasis: Treated empirically with antifungals; secondary prophylaxis is not routinely used.
4. MAC: Requires a two-drug regimen (typically azithromycin and ethambutol); ART can be started simultaneously.
5. Histoplasmosis and Coccidioidomycosis: Diagnosed based on geographic exposure and treated with amphotericin B followed by oral itraconazole.

Recommendations for Management:

• Monitoring and Adjustments: Regular monitoring of CD4 counts and viral loads is essential for adjusting treatment and prophylaxis.
• Awareness of Drug Interactions: Be cautious of potential drug side effects, such as methemoglobinemia from dapsone.
• Recognition of Immune Reconstitution Inflammatory Syndrome (IRIS): Occurs when the immune system begins to recover after ART, leading to worsening symptoms of pre-existing infections.

Featured Researchers/Sources:

• Jackie Sherbuk, MD
• Tampa General Hospital (TGH)
• National HIV Curriculum

This summary encapsulates the key points and methodologies discussed in the video regarding the management of HIV-associated Opportunistic Infections.