Zusammenfassung
Die atopische Dermatitis (AD, syn.: atopisches Ekzem, Neurodermitis) ist eine zum Formenkreis der atopischen Erkrankungen gehörende, chronisch persistierende oder chronisch rezidivierende, inflammatorische Systemerkrankung, die insbesondere mit einem unterschiedlich stark ausgeprägten Ekzem und Pruritus einhergeht. Neben dem möglichen Befall des gesamten Integuments findet sich häufig auch eine Beteiligung der periokulären Lidhaut sowie der Augenoberfläche. Ein okulärer Befund kann auch ohne Beteiligung der Gesichts- oder Körperhaut auftreten. Pathophysiologisch stehen neben einer Fehlregulation des Immunsystems genetische Veränderungen in verschiedenen dermalen Strukturproteinen im Vordergrund, die zu einer gestörten Hautbarriere führen. Zusätzlich bestehen regelhaft eine gehäufte Kolonisation mit bakteriellen Erregern und eine erhöhte Anfälligkeit für virale Infektionen der Haut. An den Lidern und auf der Augenoberfläche kommt es zu einem Verlust von Meibomdrüsen und Becherzellen. Konsekutiv bilden sich Augenoberflächendefekte und rezidivierende Binde- und Hornhautinfekte. Eine erhöhte mechanische Manipulation bei Atopie-assoziiertem Pruritus wird als Ursache für die erhöhte Komorbidität mit Keratokonus gesehen. Zudem liegen Einzelfallberichte über verschiedene Malignome der Augenoberfläche bei Atopikern vor. Das Verstehen der pathophysiologischen Zusammenhänge ist essenziell für eine korrekte Diagnostik und Therapie dieses klinisch sehr komplexen Krankheitsbildes.
Abstract
Atopic dermatitis (AD) is a systemic inflammatory disease, which is characterized by pronounced eczema and pruritus. In addition to the involvement of the entire integument, the periocular lid skin and the surface of the eye are frequently involved. Ocular involvement may occur solely without dermatitis of facial or body skin. Pathophysiologically, besides a dysregulated immune response, genetic changes can occur in various dermal structural proteins which will lead to a disturbed skin barrier. Furthermore, there is a regular colonization with bacterial pathogens and an increased susceptibility for viral skin infections. The lid margin reveals a loss of Meibomian glands whereas the conjunctiva shows reduced goblet cells. Consecutively, eye surface defects and recurrent conjunctival and corneal defects can be found. Increased mechanical manipulation in atopia-associated pruritus is seen as a cause of increased comorbidity with keratoconus. In addition, individual cases are reported of various malignomas of the eye surface, which are present in patients with AD. Understanding of the pathophysiological connections is essential for the correct diagnosis and therapy of this clinically very complex disease picture.
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T. Lapp, P. Maier, T. Jakob und T. Reinhard geben an, dass kein Interessenkonflikt besteht.
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Lapp, T., Maier, P., Jakob, T. et al. Pathophysiologie der atopischen Blepharokeratokonjunktivitis. Ophthalmologe 114, 504–513 (2017). https://doi.org/10.1007/s00347-017-0483-1
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DOI: https://doi.org/10.1007/s00347-017-0483-1