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Central nervous system opportunistic infections in developed countries in the highly active antiretroviral therapy

Christian Manzardo1, María Del Mar Ortega, Omar Sued

  • 1Infectious Diseases Service, Hospital Clinic, Institut d'Investigacions Biomediques August Pi i Sunyer, University of Barcelona, Barcelona, Spain.

Journal of Neurovirology
|March 17, 2006
PubMed

Insights

Highly active antiretroviral therapy (HAART) reduced central nervous system (CNS) opportunistic infections (OIs) in AIDS patients. However, immune reconstitution inflammatory syndrome (IRIS) can cause worsening or improvement of CNS OIs.

Area of Science:

  • Neurology
  • Infectious Diseases
  • Immunology

Background:

  • Central nervous system (CNS) opportunistic infections (OIs) incidence decreased with highly active antiretroviral therapy (HAART).
  • The spectrum of common CNS OIs in acquired immunodeficiency syndrome (AIDS) patients remains consistent, including toxoplasmosis, cryptococcosis, tuberculosis, and progressive multifocal leukoencephalopathy (PML).
  • Primary CNS lymphoma is a critical differential diagnosis for focal lesions.

Purpose of the Study:

  • To review the current diagnostic approaches for CNS OIs in AIDS patients.
  • To discuss the impact of HAART on CNS OIs, including the phenomenon of immune reconstitution inflammatory syndrome (IRIS).
  • To outline long-term management strategies for CNS OIs.

Main Methods:

  • Neuroimaging techniques (SPECT, PET, MRI, CT) combined with cerebrospinal fluid (CSF) molecular studies and therapeutic response assessment.
  • Stereotactic biopsy reserved for atypical or non-responsive cases.
  • Analysis of clinical outcomes and disease spectrum changes post-HAART initiation.

Main Results:

  • HAART has significantly decreased the incidence of most CNS OIs.
  • Despite HAART, common CNS OIs like toxoplasmosis, cryptococcosis, tuberculosis, and PML persist.
  • Immune reconstitution inflammatory syndrome (IRIS) can manifest as paradoxical worsening of CNS OIs or, conversely, improve prognoses for conditions like PML.

Conclusions:

  • Accurate diagnosis of CNS OIs relies on integrated neuroimaging, molecular CSF analysis, and clinical response.
  • Lifelong maintenance therapy is crucial for preventing OI recurrences post-acute treatment.
  • HAART-induced immune reconstitution presents a complex interplay, potentially causing IRIS or offering therapeutic benefits for specific CNS conditions.

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