Zusammenfassung
Charakteristika
Die primäre ziliäre Dyskinesie (PCD) ist eine seltene angeborene Erkrankung der Zilien, die sich zumeist im respiratorischen System manifestiert.
Diagnostik
Bei klinischem Verdacht auf das Vorliegen einer PCD und/oder bei positivem Screening (erniedrigte nasale NO-Werte) sollten Patienten zeitnah weitere diagnostische Maßnahmen durchlaufen. In Zentren, in denen eine Hochfrequenzvideomikroskopieanalyse (HVMA) des Zilienschlags zur Verfügung steht, ist eine initiale nasale NO-Messung zum Screening nicht zwingend erforderlich. Als erste diagnostische Maßnahme zur Sicherung oder zum Ausschluss einer PCD sollte eine HVMA erfolgen. Bei auffälligem Befund sind eine transmissionselektronenmikroskopische Analyse (TEM) der Ultrastruktur und eine hochauflösende immunfluoreszenzmikroskopische Analyse (IF) der Zilien anzuschließen. Obligat für die Diagnosestellung sind mindestens 2 kongruente pathologische Befunde aus HVMA, TEM oder IF. Wenn eine PCD-Variante ohne Hinweis auf einen ultrastrukturellen Defekt vorliegt, muss ein identischer pathologischer Zilienschlag mittels HVMA an insgesamt 3 unabhängigen Terminen belegt werden. Danach sollte auf Basis der erhobenen Befunde für HVMA, TEM und IF eine gerichtete genetische Abklärung angestrebt werden. Ein eindeutiger genetischer Befund kann die Diagnose ebenfalls sichern.
Vorgehen
Bei Verdacht auf eine PCD soll Kontakt mit einem Diagnosezentrum aufgenommen werden. Ein Referenzzentrum für PCD-Diagnostik evaluiert unklare Befunde.
Abstract
Characteristics
Primary ciliary dyskinesia (PCD) is a rare congenital disease of the cilia which is mostly manifested in the respiratory system.
Diagnostics
When there is a clinical suspicion of the presence of PCD and/or a positive screening result with reduced nasal nitrogen oxide (NO) values, further diagnostic measures should be initiated as soon as possible. In centers where high-frequency video microscopy analyses (HVMA) of beating of cilia are available, an initial nasal NO measurement for screening must not necessarily be carried out. As the first diagnostic measure for confirmation or exclusion of PCD, HVMA should be carried out. If the findings are conspicuous transmission electron microscopic analysis (TEM) of the ciliary structure and high-resolution immunofluorescence (IF) microscopic analysis of the cilia should follow. Mandatory for diagnosis are at least two congruent pathological findings from HVMA, TEM or IF. When a PCD variant with no evidence of ultrastructural defects is present, an identical pathological beating of cilia must be demonstrated with HVMA on three independent occasions. Following that a targeted genetic clarification should be attempted based on the findings for HVMA, TEM and IF. A clear genetic result can also confirm the diagnosis.
Approach
When PCD is suspected contact with a diagnostic center should be made. A reference center for PCD diagnostics will evaluate uncertain findings.
Abbreviations
- ATS:
-
American Thoracic Society
- DNA:
-
Desoxyribonukleinsäure
- DRC:
-
Dyneinarmregulatorkomplex
- EDTA :
-
Ethylendiamintetraessigsäure
- ERS:
-
European Respiratory Society
- HVMA :
-
Hochfrequenzvideomikroskopieanalyse
- IDA:
-
„Inner dynein arm“
- IF :
-
Immunfluoreszenz
- KS:
-
Kartagener-Syndrom
- NO:
-
Stickstoffmonoxid
- ODA:
-
„Outer dynein arm“
- PCD:
-
„Primary ciliary dyskinesia“
- ppb:
-
„Parts per billion“
- RDS:
-
„Respiratory distress syndrome“
- RPMI:
-
„Roswell Park Memorial Institute medium“
- TEM:
-
Transmissionselektronenmikroskopie
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Nüßlein, T., Brinkmann, F., Ahrens, P. et al. Diagnostik der primären ziliären Dyskinesie. Monatsschr Kinderheilkd 161, 406–416 (2013). https://doi.org/10.1007/s00112-012-2798-y
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DOI: https://doi.org/10.1007/s00112-012-2798-y
Schlüsselwörter
- Zilien
- Stickstoffmonoxid (NO)
- Hochfrequenzvideomikroskopieanalyse
- Transmissionselektronenmikroskopie
- Immunfluoreszenzmikroskopie