Thoracic endovascular stent grafting inhibits aortic growth: an experimental study

Michael P. Siegenthaler, Ramazan Celik, Joerg Haberstroh, Pietro Bajona, Heike Goebel, Kerstin Brehm, Wulf Euringer, Friedhelm Beyersdorf

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Objective: Dilatation of the aorta at the landing zone site may be exaggerated by the radial force of stent grafts potentially limiting long-term results of endovascular therapy. We evaluated growth patterns and morphology of the thoracic aorta in young piglets after thoracic stent-graft placement. Methods: Eight domestic piglets (37 ± 2 kg) had an endovascular stent graft placed in the proximal descending thoracic aorta using retroperitoneal access. At implantation, the stent was oversized by 10%. Aortic size was documented after thoracotomy by intraoperative measurement and angiography. Subsequently the piglets were grown to adult size (181 ± 42 kg). At explantation 6-15 months later, CT scan and surgical evaluation for endoleaks, defined as perigraft flow, was performed. Histopathological assessment of the explanted aorta was performed in stented and non-stented segments and compared to five normal porcine aortas. Results: No endoleak (perigraft flow) or stent migration occurred even in 230 kg pigs. The stent grafts expanded to full size, but there was no further growth in the stented area. The aortic diameter increased significantly by 32 ± 9% 1 cm proximal to the stents (p = 0.0012) and by 45 ± 13% 1 cm distal to the stents (p = 0.0033). The stented area grew less than the proximal (p = 0.0011) and distal aorta (p < 0.0001). In all pigs, the distal aorta was larger than the proximal overstented segment. Histology of the stented aorta showed significant thickening of the intima (p = 0.018) and media (p = 0.006) with neointimal formation and segmental fibrosis of the inner 1/3 of the media with loss of smooth muscle cells and compression of the elastic fibers but normal architecture in the outer 2/3 of the media. Conclusions: Endovascular stent grafting may inhibit growth of the nonatherosclerotic normal aorta and lead to intimal hyperplasia and focal fibrosis in the inner media part adjacent to the stent. Stent-graft interaction with aortic tissue over time is important and should receive more detailed evaluation. Testing this interaction in an animal model of nonatherosclerotic dilative aortic disease could be of great interest.

Original languageEnglish (US)
Pages (from-to)17-24
Number of pages8
JournalEuropean Journal of Cardio-thoracic Surgery
Volume34
Issue number1
DOIs
StatePublished - Jul 1 2008

Keywords

  • Descending thoracic aorta
  • Endovascular stent
  • Marfan syndrome
  • Porcine aorta
  • Type 1 endoleak

ASJC Scopus subject areas

  • Surgery
  • Pulmonary and Respiratory Medicine
  • Cardiology and Cardiovascular Medicine

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  • Cite this

    Siegenthaler, M. P., Celik, R., Haberstroh, J., Bajona, P., Goebel, H., Brehm, K., Euringer, W., & Beyersdorf, F. (2008). Thoracic endovascular stent grafting inhibits aortic growth: an experimental study. European Journal of Cardio-thoracic Surgery, 34(1), 17-24. https://doi.org/10.1016/j.ejcts.2008.03.045