4.4 Article

Healing of saccular aneurysms following platinum coil embolization: lack of improved efficacy with vitamin C supplementation

Journal

JOURNAL OF NEUROINTERVENTIONAL SURGERY
Volume 5, Issue 6, Pages 591-596

Publisher

BMJ PUBLISHING GROUP
DOI: 10.1136/neurintsurg-2012-010421

Keywords

Aneurysm; Vessel Wall; Intervention

Funding

  1. American Heart Association Scientist Development grant [AHA 09SDG2160146-01]
  2. National Institutes of Health grant [R01NS076491]

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Background and purpose To test the hypothesis that systemic administration of vitamin C, through its action of stimulating collagen synthesis and crosslinking, would decrease the recurrence and improve the occlusion of experimental aneurysms treated with platinum coils. Methods Experimental aneurysms were created in female rabbits and were embolized with platinum coils (>30% packing density). The animals were divided into three groups: group 1 (n=6) rabbits served as controls, group 2 (n=5) rabbits were fed with a vitamin C supplemented feed and group 3 (n=8) rabbits were medicated with vitamin C pills. Digital subtraction angiography was used to evaluate stability after embolization. Subjects were euthanized at 12weeks after coil implantation, and serum vitamin C levels were then measured. Histological samples were examined with a grading system (range 0-12) based on the neck and dome features. Masson Trichrome staining was used to evaluate collagen deposition. Parametric data were analyzed with one way analysis of variance and non-parametric data were examined using a Kruskal-Wallis test. Results There were no significant differences between groups in mean aneurysm size. Mean serum vitamin C concentration was significantly higher in group 3 and group 2 compared with group 1, while vitamin C levels between group 2 and group 3 were statistically comparable. Coil compaction was noted in one of six subjects in group 1 and in three of eight subjects in group 3. All of the remaining aneurysms in the test and control groups showed stable occlusion. There were no significant differences in histological scores or collagen deposition among groups. Conclusions Vitamin C supplementation following platinum coil embolization does not demonstrate improvement of long term occlusion rates of aneurysms.

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