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Macrophage Cholesterol Depletion and Its Effect on the Phagocytosis of Cryptococcus neoformans
Published on: December 19, 2014
Cryptococcal meningitis
Tihana Bicanic1, Thomas S Harrison
1Division of Infectious Diseases, Department of Cellular and Molecular Medicine, St. George's Hospital Medical School, London, UK.
Abstract:
Cryptococcal meningitis is a common opportunistic infection in AIDS patients, particularly in Southeast Asia and Africa. Cases also occur in patients with other forms of immunosupression and in apparently immunocompetent individuals. Mortality from HIV-associated cryptococcal meningitis remains high (10-30%), even in developed countries, because of the inadequacy of current antifungal drugs and the complication of raised intracranial pressure. In cohorts of HIV-infected patients from sub-Saharan Africa, cryptococcosis has accounted for 13-44% of all deaths. Optimal current therapy is with amphotericin B 0.7-1 mg/kg/day plus flucytosine 100 mg/kg/day for 2 weeks, followed by fluconazole 400 mg/day for 8 weeks and 200 mg/day thereafter. Saline loading reduces amphotericin B nephrotoxicity. If there is no contraindication on CT head scan, repeat lumbar puncture with drainage of cerebrospinal fluid (CSF) is recommended for patients with very raised CSF opening pressure. Expansion of antiretroviral programmes raises the prospect of transforming the long-term prognosis of these patients, provided that they survive the acute phase of the illness. Studies are needed to define more fungicidal drug regimens and to improve the treatment of raised intracranial pressure.
Insights
Cryptococcal meningitis in AIDS patients has high mortality due to limited antifungal drugs and increased intracranial pressure. Improved treatments and antiretroviral therapy are crucial for better outcomes in these opportunistic infections.
Area of Science:
- Infectious Diseases
- Neurology
- Immunology
Background:
- Cryptococcal meningitis is a significant opportunistic infection in individuals with Acquired Immunodeficiency Syndrome (AIDS).
- High mortality rates persist despite current treatments, particularly in regions with a high prevalence of HIV/AIDS.
- Raised intracranial pressure is a major complication exacerbating mortality in HIV-associated cryptococcal meningitis.
Purpose of the Study:
- To review the current understanding of cryptococcal meningitis in HIV-infected individuals.
- To discuss the challenges and limitations of existing therapeutic strategies.
- To highlight areas for future research and treatment improvement.
Main Methods:
- Literature review of cryptococcal meningitis in immunocompromised patients.
- Analysis of current treatment guidelines and their efficacy.
- Discussion of complications and management strategies.
Main Results:
- Mortality from HIV-associated cryptococcal meningitis remains high (10-30%) due to drug limitations and intracranial pressure.
- Optimal therapy involves amphotericin B and flucytosine, followed by fluconazole, with supportive measures like saline loading and CSF drainage.
- Antiretroviral therapy expansion offers hope for long-term prognosis if the acute phase is managed successfully.
Conclusions:
- There is a critical need for more effective antifungal drug regimens.
- Improved management of raised intracranial pressure is essential for reducing mortality.
- Advancements in antiretroviral programs, coupled with optimized meningitis treatment, can transform patient outcomes.
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