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J Vasc Surg. 2016 Aug;64(2):306-312. doi: 10.1016/j.jvs.2016.02.053. Epub 2016 Apr 9.

Migration of the Nellix endoprosthesis.

Author information

1
Directorate of Radiography, University of Salford, Manchester, United Kingdom. Electronic address: a.england@salford.ac.uk.
2
Liverpool Vascular and Endovascular Service, Royal Liverpool Hospital National Health Service Trust, Liverpool, United Kingdom.
3
Department of Radiology, Royal Liverpool & Broadgreen University Hospitals National Health Service Trust, Liverpool, United Kingdom.

Abstract

BACKGROUND:

This study reports the incidence and sequelae of migration of the Nellix (Endologix Inc, Irvine, Calif) endoprosthesis after endovascular aneurysm sealing.

METHODS:

A review was performed of the follow-up imaging of all endovascular aneurysm sealing patients in a university hospital endovascular program who had a minimum follow-up of 1 year. The first postoperative and latest follow-up computed tomography scans were used to measure the distances between the proximal and distal borders of the stent grafts relative to reference vessels using a previously validated technique. Device migration was based on previously established criteria and defined as any stent graft movement of ≥4 mm related to a predefined reference vessel. Device movement in a caudal direction was given a positive value, and movement in a cranial direction was denoted by a negative value.

RESULTS:

Eighteen patients (35 stent grafts) were eligible for inclusion in this retrospective review. The mean preoperative abdominal aortic aneurysm diameter was 57 mm (standard deviation [SD], 5; range, 50-67 mm) and aortic neck length was 30 mm (SD, 16; range, 6-62 mm). Proximal migration, according to study definitions, was identified in six stent grafts (17%), all in a caudal direction. At 1 year the mean proximal migration distance was +6.6 mm (SD, 1.6; range, +4.7-+9.2 mm). Migration occurred in a single stent graft in four patients and bilaterally in one. No distal migration occurred.

CONCLUSIONS:

Proximal migration of the Nellix endoprosthesis does occur and was without any sequelae in our series. Further investigations into the long-term positional stability of the Nellix device, together with a more thorough understanding of the etiology and consequences of migration, are required.

Comment in

PMID:
27066946
DOI:
10.1016/j.jvs.2016.02.053
[Indexed for MEDLINE]
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