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Analysis of 18FDG PET/CT Imaging as a Tool for Studying Mycobacterium tuberculosis Infection and Treatment in Non-human Primates
Published on: September 5, 2017
[Modern concepts on the pathogenesis and therapy of tuberculous meningitis]
1Dr Kosta Todorovitsh, Institute of Infective and Tropical diseases, Clinical centre of Serbia, Belgrade.
Abstract:
The study concerned pathogenetic mechanisms of occurrence of tuberculous meningitis and modern recommendations for therapy. Meningitis has never been a primary localization of tuberculous infection, but the latter appears by dissemination from some primary, extrameningeal focus which is frequently clinically unapparent. The second possibility of meninegeal appearance is a rupture of subependymal tubercles into the subarachnoid area, discharge of their caseous content and transition of mycobacteria into liquor. These tubercles occurred by previous haematogenous dissemination in the preallergic phase of pulmonary primoinfection or reinfection, several months or years prior to meningeal appearance. Treatment of tuberculous meningitis lasts nine months; daily application of three or four antituberculous drugs is recommended for the first two months, and then intermittent therapy by isoniazid and Rifadin is continued during the following seven months. The results of this short-course, intermittent therapy are the same, or better, than the results of "standard" therapy which lasted 18-24 months.
Insights
Tuberculous meningitis arises from disseminated tuberculosis, not primary infection. A nine-month treatment regimen using multiple antituberculous drugs shows effective outcomes, comparable or superior to longer standard therapies.
Area of Science:
- Infectious Diseases
- Neurology
- Microbiology
Context:
- Tuberculous meningitis (TBM) is a severe form of extrapulmonary tuberculosis.
- Pathogenesis involves hematogenous dissemination from an occult primary focus.
- Subependymal tubercles can rupture, seeding mycobacteria into the cerebrospinal fluid.
Purpose:
- To elucidate the pathogenetic mechanisms of tuberculous meningitis.
- To review modern therapeutic recommendations for TBM.
- To evaluate the efficacy of short-course intermittent therapy.
Summary:
- TBM originates from disseminated infection, often from an unapparent primary site.
- Rupture of subependymal tubercles into the subarachnoid space facilitates meningeal spread.
- A nine-month treatment regimen, including initial daily multi-drug therapy followed by intermittent isoniazid and Rifadin, yields comparable or superior outcomes to prolonged standard treatments (18-24 months).
Impact:
- Highlights the importance of recognizing TBM's secondary nature in diagnosis.
- Supports the adoption of shorter, intermittent therapeutic regimens for TBM.
- Offers a more effective and potentially less burdensome treatment strategy for TBM patients.
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