Zusammenfassung
Hintergrund
Die Ruptur eines abdominalen Aortenaneurysmas (AAA) ist mit einer hohen Letalität assoziiert. Die rechtzeitige Diagnose und elektive Operation eines rupturgefährdeten AAA stellt die einzig mögliche präventive Therapie dar. Mittels einer B-Bild-Sonographie können AAAs mit hoher Zuverlässigkeit frühzeitig erkannt werden. Ein populationsbasiertes Ultraschallscreening könnte das Risiko einer AAA-Ruptur verringern.
Material und Methoden
Es erfolgte eine Literaturanalyse (bis Juni 2014, MEDLINE, PubMed, SCOPUS) aller randomisiert-kontrollierten Studien (RCT), sowie systematischen Reviews, Metaanalysen, Health Technology Assessments (HTA-Berichte) und Leitlinien zum AAA-Screening. Stichworte waren: „abdominal aortic aneurysm“, „ultrasound screening“, „evidence“ und „guidelines“. Als relevante Endpunkte galten: AAA-bedingte Letalität, Gesamtletalität, Anzahl elektiver AAA-Operationen, Anzahl rupturierter AAAs und Notfalloperationen für verschiedene Untersuchungsintervalle.
Ergebnisse
In vier RCTs erfolgte bei 65 bis 83-jährigen Männern entweder eine einmalige Ultraschalluntersuchung der abdominalen Aorta oder keine Untersuchung. Ältere Frauen wurden nur in einem RCT untersucht. Die Metaanalyse der Ergebnisse zeigt, dass das Ultraschallscreening zu einer signifikanten Abnahme der AAA-bedingten Letalität, der Anzahl rupturierter abdominaler AAAs und der Anzahl notfallmäßiger AAA-Operationen führt. Die Anzahl der elektiven AAA-Operationen nimmt signifikant zu. Die Gesamtletalität wird durch das AAA-Screening nur gering verringert.
Schlussfolgerungen
Die Effizienz eines ultraschallbasierten AAA-Screenings > 65-jähriger Männer ist in populationsbasierten RCTs und nachfolgenden Metaanalysen sehr gut belegt. Derzeit wird seitens des Gemeinsamen Bundesauschusses (G-BA) und des Instituts für Qualität und Wirtschaftlichkeit im Gesundheitswesen (IQWIG) ein nationales AAA-Ultraschallscreening-Programm für Deutschland evaluiert. Weitere Studien sind notwendig, um Risikogruppen zu erfassen, die in den bisherigen Studien unterrepräsentiert waren. Hierzu gehören Männer unter 65 Jahren und Frauen mit Niktotinabusus und/oder kardiovaskulären Begleiterkrankungen.
Abstract
Background
Abdominal aortic aneurysm (AAA) rupture is associated with a high mortality. The only preventive therapy is early diagnosis and elective surgery of rupture prone AAAs. Using B-mode sonography AAAs can be detected early with great reliability. Thus, a population-based ultrasound screening might lower the risk of abdominal aortic aneurysm ruptures.
Materials and methods
A literature analysis (until June 2014) was performed in the databases of MEDLINE, PubMed, and SCOPUS including all randomized controlled trials (RCT), systematic reviews, meta-analyses, health technology assessments (HTA reports) and medical guidelines on AAA screening. The following keywords were used: abdominal aortic aneurysm, ultrasound screening, evidence, guidelines. Clinically relevant endpoints were the following: AAA-associated mortality, overall mortality, number of elective AAA operations, number of ruptured AAAs and emergency surgery for different follow-up intervals.
Results
In four RCTs men between 65 and 83 years either had a single or no ultrasound examination of the abdominal aorta. Older women were only analyzed in one RCT. The meta-analysis of the RCT results shows that ultrasound screening caused a significant decrease of AAA-associated mortality, number of ruptured abdominal aneurysms, and number of emergency operations, whereas the number of elective surgeries significantly increased. Overall mortality was only moderately decreased by AAA screening.
Conclusion
Evidence was provided in population-based RCTs and meta-analyses for the efficiency of ultrasound based AAA screening for men older than 65 years. Presently the Federal Joint Committee (G-BA) and the Institute for Quality and Efficiency in Health Care (IQWIG) are evaluating a national ultrasound-based AAA screening program for Germany. However, additional clinical trials are necessary to assess risk groups especially men under 65 years, women with nicotine abuse and cardiovascular diseases which were underrepresented in previous studies.
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Interessenkonflikt. H.-H. Eckstein, C. Reeps, A. Zimmermann und H. Söllner geben an, dass kein Interessenkonflikt besteht.
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Eckstein, HH., Reeps, C., Zimmermann, A. et al. Ultraschallscreening auf abdominale Aortenaneurysmen (AAA). Gefässchirurgie 19, 515–527 (2014). https://doi.org/10.1007/s00772-014-1324-z
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DOI: https://doi.org/10.1007/s00772-014-1324-z