Abstract
Background
Due to their hemodynamic effects and tendency to progress, the majority of congenital arterio-venous malformations (AVM) require treatment. AVM are classified according to clinical severity (Schobinger classification, stages I–V) and angiographic appearance (types I–IV).
Treatment
Endovascular embolization is the treatment of choice. However, because complications such as necrosis and neuropathy occur in up to 15% of cases, treatment is challenging and is dependent on the angiographic appearance. Critical for treatment success is elimination of the so-called nidus, which is the location of the short circuit connection between the artery and the often extended aneurysm-like drainage vein. Embolization of only the feeding artery without the actual nidus or the incomplete elimination of drainage veins should be avoided. Absolute 96 % alcohol in addition to coiling of the nidus has been established as the most effective technique.
Conclusion
Unlike other embolic agents, alcohol leads to a definitive destruction of the vessel wall. Recanalization and recurrence are excluded due to adequate elimination of the nidus.
Zusammenfassung
Hintergrund
Angeborene arteriovenöse Malformationen (AVM) stellen aufgrund ihrer hämodynamischen Auswirkungen und Progressionstendenz mehrheitlich eine Therapieindikation dar. AVM werden nach ihrem klinischen Schweregrad (Schobinger-Klassifikation, Stadium I–V) und ihrem angiographischen Erscheinungsbild (Typ I–IV) eingeteilt.
Behandlung
Therapie der Wahl ist die kathetertechnische Embolisation wobei die Behandlung aufgrund der hohen Komplikationsraten mit Nekrosen und Neuropathien in bis zu 15 % der Fälle anspruchsvoll ist, und sich die Technik nach dem angiographischen Erscheinungsbild richtet. Entscheidend für den Therapieerfolg ist die Ausschaltung des sog. „Nidus“, der den Ort der Kurzschlussverbindung zwischen der Arterie und der oft aneurysmartisch erweiterten Drainagevene darstellt. Zu vermeiden ist die alleinige Embolisation der zuführenden Arterie ohne den eigentlichen Nidus zu erreichen oder die inkomplette Ausschaltung von Drainagevenen. Absoluter 96 %-iger Alkohol in Verbindung mit einem Coiling des Nidus ist als die effektivste Technik etabliert.
Schlussfolgerung
Im Gegensatz zu anderen Embolisaten führt Alkohol zu einer definitiven Zerstörung der Gefäßwand, wodurch eine Rekanalisation und ein Auftreten eines Rezidivs bei adäquater Ausschaltung des Nidus ausgeschlossen ist.
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Conflict of interest. W. Yakes and I. Baumgartner state that there are no conflicts of interest. The accompanying manuscript does not include studies on humans or animals.
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Yakes, W., Baumgartner, I. Interventional treatment of arterio-venous malformations. Gefässchirurgie 19, 325–330 (2014). https://doi.org/10.1007/s00772-013-1303-9
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DOI: https://doi.org/10.1007/s00772-013-1303-9