Influence of endograft oversizing on device migration, endoleak, aneurysm shrinkage, and aortic neck dilation: Results from the Zenith multicenter trial

Sternbergh, W. Charles, Money, Samuel R., Greenberg, Roy K. and Chuter, Timothy A. M. (2004). Influence of endograft oversizing on device migration, endoleak, aneurysm shrinkage, and aortic neck dilation: Results from the Zenith multicenter trial. In: 57th Annual Meeting of the Society for Vascular Surgery. Proceedings. The SVS/AAVS Vascular Annual 2003 and the SVMB 14th Annual Meeting, Chicago, IL, U.S.A., (20-26). 8-11 June 2003. doi:10.1016/j.jvs.2003.09.022


Author Sternbergh, W. Charles
Money, Samuel R.
Greenberg, Roy K.
Chuter, Timothy A. M.
Title of paper Influence of endograft oversizing on device migration, endoleak, aneurysm shrinkage, and aortic neck dilation: Results from the Zenith multicenter trial
Conference name The SVS/AAVS Vascular Annual 2003 and the SVMB 14th Annual Meeting
Conference location Chicago, IL, U.S.A.
Conference dates 8-11 June 2003
Proceedings title 57th Annual Meeting of the Society for Vascular Surgery. Proceedings   Check publisher's open access policy
Journal name Journal of Vascular Surgery   Check publisher's open access policy
Place of Publication Philadelphia, PA, U.S.A.
Publisher Mosby
Publication Year 2004
Year available 2003
Sub-type Fully published paper
DOI 10.1016/j.jvs.2003.09.022
ISSN 0741-5214
1097-6809
1085-875X
Volume 39
Issue 1
Start page 20
End page 26
Total pages 6
Language eng
Formatted Abstract/Summary
Background: Generous endograft oversizing has been associated with propensity for aortic neck dilation and subsequent device migration in endografts without suprarenal fixation. Effects of variable oversizing of endografts with suprarenal fixation have been poorly studied.

Methods: Three hundred fifty-one patients underwent endovascular AAA repair (EVAR) in a prospective multicenter trial using the Zenith AAA Endovascular Graft, a fully supported bifurcated 3-piece endograft with barb-enhanced suprarenal stent fixation. Blinded core-laboratory measurement of variables was prospectively recorded at predischarge and at 1, 6, 12, and 24 months after the procedure. Potential influence of endograft oversizing on subsequent aortic neck dilation (minor axis), aneurysm shrinkage (major axis), device migration, endoleak, rupture, open conversion, and death were retrospectively studied. Data are given as mean ± SEM.

Results: Risk of endograft migration (>5mm) at 12 months was 2.3% (6/261). However, patients with endograft oversizing of >30% had a 14% (4/29) migration risk compared with those oversized ≤30% (0.9%, 2/232), P < .002. There was zero device migration by the SVS definition (>10 mm or clinical event). Device oversizing >30% was associated with decreased AAA sac shrinkage (48% vs 77%) and with increased sac enlargement (9.5% vs 0.6%) at 24 months when compared with oversizing of ≤30%, respectively (P = .001). Incidence rate of any endoleak at 12 and 24 months was 8.2% (21/256) and 7.1% (12/169), respectively. Oversizing of endografts by >30% was associated with an increased type II endoleak rate (11 vs 4.7%) that failed to reach statistical significance (P = .27). Aortic neck diameters increased significantly by 6 months (P < .001) but then stabilized through 24 months; the absolute changes at 1 (n = 298), 6 (n = 278), 12 (n = 264), and 24 months (n = 171) were 0.66 ± 0.10 mm (3.0%), 1.32 ± 0.11 mm (5.6%), 1.38 ± 0.12 mm (5.9%), and 1.44 ± 0.16 mm (6.1%), respectively. Linear regression analysis demonstrated no correlation between endograft oversizing and aortic neck dilation at 12 (P = .86) or 24 months (P = .64).

Conclusions: Device migration and endoleaks were very infrequent after treatment with the Zenith AAA Endovascular Graft. However, endograft oversizing of >30% was associated with an ∼ 14-fold increase in device migration (>5 mm) at 12 months and with a ∼ 16-fold increased risk of AAA expansion at 24 months. Although further follow-up will be essential to assess whether these early associations continue, avoidance of excessive endograft oversizing is recommended.
Keyword Stent-graft
Clinical-trial
Repair
Update
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Meeting originally scheduled to be held in Toronto, Ontario. Publication date: January 2004. Available online 24 December 2003.

Document type: Conference Paper
Collection: School of Medicine Publications
 
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Created: Mon, 14 Mar 2011, 20:05:13 EST