Zusammenfassung
□ Epidemiologie
Die MAC-Infektion ist eine der häufigsten opportunistischen Infektionen bei HIV-infizierten Patienten und tritt besonders bei stark eingeschränktem Immunsystem auf (CD4-Zellen<50/μl). Die Prognose der unbehandelten Erkrankung ist mit durchschnittlich fünf bis sechs Monaten sehr schlecht. Durch eine Therapie konnte bisher eine Lebensverlängerung von vier Monaten erreicht werden.
□ Klinik und Diagnostik
Leitsymptom der disseminierten MAC-Infektion ist Fieber, weitere Symptome sind Gewichtsverlust, Nachtschweiß, Lymphknotenschwellungen, Hepatosplenomegalie, Bauchschmerzen und eine Anämie. Die Diagnose wird in der Regel über den Nachweis des Erregers in der Blutkultur gestellt, die eine hohe Sensitivität hat. Weitere diagnostische Möglichkeiten bestehen in der Kultur des Knochenmarks sowie Biopsien des Magen-Darm-Traktes, von Lymphknoten und der Leber. Der Erregernachweis im Sputum oder Stuhl beweist nur eine Kolonisation, geht aber häufig einer disseminierten Infektion voraus.
□ Therapie
Eine Kombination bestehend aus Clarithromycin, Rifabutin und Ethambutol hat sich als wirksamste Therapieform erwiesen und muß inzwischen als Standardtherapie angesehen werden. Hauptsächliche Nebenwirkungen bestehen in einer Uveitis (Rifabutin), gastrointesinalen Störungen (Clarithromycin) und einer Leukopenie (Rifabutin). Ein häufig auftretendes klinisches Problem sind Interaktionen (vor allem des Rifabutins) mit Proteaseinhibitoren.
□ Prophylaxe
Eine wirksame medikamentöse Prophylaxe der MAC-Infektion ist mit Clarithromycin, Rifabutin und Azithromycin möglich. Obwohl für die Prophylaxe mit Clarithromycin sogar ein Überlebensvorteil nachgewiesen ist, hat sich eine Primärprophylaxe der MAC-Infektion noch nicht allgemein durchgesetzt. Hauptgründe hierfür sind unterschiedliche Inzidenzen in verschiedenen Ländern sowie Nebenwirkungen und Medikamenteninteraktionen der zur Verfügung stehenden Präparate.
□ Schlußfolgerung
Die MAC-Infektion ist eine häufige opportunistische Erkrankung im Endstadium der HIV-Infektion. Die antibiotische Kombinationstherapie mit Clarithromycin, Rifabutin und Ethambutol führt zu einer Besserung der Symptome und einer Lebensverlängerung. Eine medikamentöse Primärprophylaxe ist mit verschiedenen Regimen möglich. Sie hat sich jedoch wegen der unterschiedlichen epidemiologischen Situation in verschiedenen Ländern bisher nicht allgemein durchgesetzt.
Abstract
□ Epidemiology
Disseminated MAC-infection is one of the most frequent opportunistic infections occuring in HIV-infected patients. Severely immunocompromised patients with CD4-counts < 50 /μl are at greatest risk for the disease. Survival of untreated infection is very poor (5 to 6 months). With therapy survival is prolonged by about 4 months.
□ Clinical Presentation and Diagnostic Procedures
The leading symptom of MAC-infection is fever eventually accompanied by weight lost, night sweats, enlarged lymph nodes, hepatosplenomegaly, abdominal pain and anemia. Blood cultures are very sensitive and the most appropriate examination. Other diagnostic procedures include bone marrow cultures, biopsies of the gastrointestinal tract, lymph nodes and the liver. Detection of MAC in sputum and stool samples only proves colonisation but not dissemination. However, colonisation of the gastrointestinal tract frequently precedes disseminated disease.
□ Therapy
Combination of clarithromycin, rifabutin and ethambutol has proven to be the most efficacious therapy and therefore has to be considered as standard therapy for disseminted MAC-infection. Problems most frequently encountered with this medication include uveitis (rifabutin), gastrointestinal disturbances (clarithromycin) and leucopenia (rifabutin) as well as drug interactions with protease-inhibitors (rifabutin).
□ Prophylaxis
Clarithromycin, rifabutin and azithromycin given as primary prophylaxis can diminish the risk of disseminated MAC-infection. Although a survival benefit has been seen with clarithromycin, primary prophylaxis of MAC-infection is not standard care in many centers. Reasons to withhold MAC-prophylaxis include lower incidence rates in some countries as well as possible side effects and drug interactions.
□ Conclusion
Disseminated MAC-infection is a frequent opportunistic disease in HIV-infected persons who are severely immunocompromised. Antibiotic combination therapy with clarithromycin, rifabutin and ethambutol improves clinical symptoms and survival. Primary prophylaxis with different regimens is efficacious but the specific epidemiologic situation in each country has to be considered.
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Fätkenheuer, G., Salzberger, B. & Diehl, V. Die disseminierte Infektion mit Mycobacterium avium complex (MAC) bei HIV-Infektion. Med Klin 93, 360–364 (1998). https://doi.org/10.1007/BF03044680
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DOI: https://doi.org/10.1007/BF03044680