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Aneurysm healing after endovascular treatment in the Helsinki sidewall aneurysm model: a systematic review
  1. Lorenzo Rinaldo1,2,
  2. Jorge L Arturo Larco3,
  3. Ramanathan Kadirvel1,3,
  4. David F Kallmes3
  1. 1Department of Neurosurgery, Mayo Clinic, Rochester, New York, USA
  2. 2Department of Neurosurgery, University of California San Francisco, San Francisco, Northern California, USA
  3. 3Radiology, Mayo Clinic, Rochester, Minnesota, USA
  1. Correspondence to Dr Lorenzo Rinaldo, Department of Neurosurgery, Mayo Clinic, 200 1st SW, Rochester, MN, 55905, USA; rinaldo.lorenzo{at}mayo.edu

Abstract

Aims Intracranial aneurysms are treated with a variety of endovascular devices including coils, stents, and flow diverters. The mechanisms by which these devices result in aneurysm occlusion and subsequent healing have been the subject of significant research using various animal models. The murine Helsinki aneurysm model is a sidewall aneurysm created by the end-to-side anastomosis of a donor aortic graft onto the abdominal aorta of a recipient animal. The aim of this systematic review is to assess the efficacy of different endovascular devices for the treatment of the Helsinki model aneurysm.

Methods We performed a systematic review of Pubmed in accordance with PRISMA guidelines, yielding eight studies detailing the results of endovascular treatment of this preclinical aneurysm model. Studies were included if they provided rates of complete aneurysm occlusion after treatment.

Results In these studies, aneurysms were treated with coiling (n=81, 7 studies), stenting (n=67, 3 studies), stent-coiling (n=13, 1 study), and flow diversion (n=49, 2 studies). The results of each individual study are discussed with the goal of providing a measure of the relative efficacy of different endovascular devices for the treatment of this particular model aneurysm. We also pay special attention to insights into the mechanisms underlying aneurysm healing after different forms of endovascular therapy.

Conclusion The data presented here may be useful to investigators attempting to demonstrate superiority of novel endovascular devices relative to previous device iterations using this preclinical model.

  • Aneurysm
  • Flow Diverter
  • Coil

Data availability statement

Data are available upon reasonable request. Please contact the corresponding author to obtain data.

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Data availability statement

Data are available upon reasonable request. Please contact the corresponding author to obtain data.

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Footnotes

  • Contributors LR: study conceptualization, drafting manuscript, critically reviewing manuscript, final approval of manuscript, accountable for all aspects and guarantor of this study. JLAL: study conceptualization, critically reviewing manuscript, final approval of manuscript, accountable for all aspects. RK: study conceptualization, critically reviewing manuscript, final approval of manuscript, accountable for all aspects. DFK: study conceptualization, critically reviewing manuscript, final approval of manuscript, accountable for all aspects.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Provenance and peer review Not commissioned; externally peer reviewed.