Zusammenfassung
Hintergrund
Infektionen stellen bei kritisch kranken Patienten nach wie vor eine besondere Herausforderung für den behandelnden Arzt dar. Einer der Schlüsselfaktoren für therapeutischen Erfolg sind suffiziente Konzentrationen des eingesetzten Antibiotikums am Ort der Infektion. Zumeist ist dies der interstitielle Raum des betroffenen Organs oder ein Körperhohlraum, wesentlich seltener sind vitale Bakterien innerhalb von Körperzellen lokalisiert.
Material und Methoden
Verschiedene Methoden zur Bestimmung von Gewebekonzentrationen antimikrobieller Substanzen, darunter die Gewebebiopsie, die bronchoalveoläre Lavage und die Mikrodialyse, werden vorgestellt und die Implikationen für die Interpretation der gewonnen Daten besprochen. Exemplarisch werden Gewebekonzentrationen des hydrophilen β-Lactams Meropenem und des lipophilen Chinolons Levofloxacin gegenübergestellt und diskutiert.
Ergebnisse
Es zeigt sich, dass sowohl zwischen Plasma und Gewebe, gesunden Probanden und schwerkranken Patienten als auch zwischen den durch verschiedene Methoden im gleichen Organ erhobenen pharmakokinetischen Daten relevante Unterschiede bestehen.
Schlussfolgerungen
Eine kritische Interpretation der Daten, die von der Art des Erregers, der Lokalisation der Infektion sowie der zur Bestimmung der Gewebekonzentration eingesetzten Methodik abhängen muss, wird angeregt, um Wissen über die Pharmakokinetik einer Substanz im Gewebe optimal in der Behandlung schwerkranker Patienten einsetzen zu können.
Abstract
Background
For critically ill patients, infections still imply a major challenge for the treating physician. One key factor of successful treatment is sufficient exposure of the employed antimicrobial agent at the site of infection. In most cases, this is the interstitial space of the infected organ or a body cavity; much rarer vital bacteria are located within body cells.
Methods
Different methods for assessment of tissue pharmacokinetics of antimicrobial agents in the human body are described, including tissue biopsy, bronchoalveolar lavage and microdialysis, and their implication on interpretation of obtained data are discussed. Tissue pharmacokinetics of the hydrophilic beta-lactam meropenem and the lipophilic fluoroquinolone levofloxacin are compared.
Results
Differences in pharmacokinetics between plasma and tissue, healthy volunteers and critically ill patients but also between data obtained in the same organ by different methods are discussed.
Conclusion
In order to use pharmacokinetic data to optimize the treatment of critically ill patients, critical appraisal of the causative pathogen, the location of the infection, and the source of the used pharmacokinetic data is necessary.
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Interessenkonflikt. H. Lagler und M. Zeitlinger geben an, dass kein Interessenkonflikt besteht.
Dieser Beitrag beinhaltet keine Studien an Menschen oder Tieren.
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Lagler, H., Zeitlinger, M. Gewebepenetration von Antibiotika. Med Klin Intensivmed Notfmed 109, 175–181 (2014). https://doi.org/10.1007/s00063-013-0309-0
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DOI: https://doi.org/10.1007/s00063-013-0309-0