René Aquarius1,2, Antonius de Korte1, Debby Smits3, Matthew Gounis4, Kiek Verrijp2, Léon Driessen5, William Leenders2, Joost de Vries1. 1. Department of Neurosurgery, Radboud University Medical Center, Nijmegen, The Netherlands. 2. Department of Pathology, Radboud University Medical Center, Nijmegen, The Netherlands. 3. Central Animal Laboratory, Radboud University Medical Center, Nijmegen, The Netherlands. 4. Department of Radiology, Division of Neuroimaging and Intervention and New England Center for Stroke Research University of Massachusetts Medical School, Worcester, Massachusetts. 5. Orthopaedic Research Laboratory Radboud University Medical Center, Nijmegen, The Netherlands.
Abstract
BACKGROUND: It is assumed that high pore densities in flow diverters (FDs) are beneficial for intracranial aneurysm (IA) healing. However, various animal studies are not conclusive on the issue, suggesting that other factors are in play. One important factor might be wall apposition. OBJECTIVE: To (1) determine the relationship between FD pore density and aneurysm occlusion, and (2) determine the relationship between FD wall apposition and aneurysm occlusion. METHODS: Saccular aneurysms were microsurgically created in the aorta of 36 Wistar rats. Twelve rats received a low pore density FD (10 pores/mm2), 12 rats received a high pore density FD (23 pores/mm2), and the remaining 12 rats served as a control group. Six animals from each group were sacrificed 1 and 3 mo after surgery. We determined aneurysm occlusion, the number of struts not in contact with the aorta wall, and the average distance from malapposed struts to aorta wall through histology. RESULTS: No significant differences were found in aneurysm occlusion between the low pore density and high pore density groups (P > .05) after 1 and 3 mo of follow-up. The average number of malapposed struts was lower for the occluded aneurysm group (4.4 ± 1.9) compared to the nonoccluded aneurysm group (7.7 ± 2.6, P < .01). The average distance between malapposed struts and parent artery wall was lower for the occluded aneurysm group (33.9 μm ± 11.5 μm) than for the nonoccluded aneurysm group (48.7 μm ± 18.8 μm, P < .05). CONCLUSION: Wall apposition is more important than pore density for aneurysm occlusion.
BACKGROUND: It is assumed that high pore densities in flow diverters (FDs) are beneficial for intracranial aneurysm (IA) healing. However, various animal studies are not conclusive on the issue, suggesting that other factors are in play. One important factor might be wall apposition. OBJECTIVE: To (1) determine the relationship between FD pore density and aneurysm occlusion, and (2) determine the relationship between FD wall apposition and aneurysm occlusion. METHODS:Saccular aneurysms were microsurgically created in the aorta of 36 Wistar rats. Twelve rats received a low pore density FD (10 pores/mm2), 12 rats received a high pore density FD (23 pores/mm2), and the remaining 12 rats served as a control group. Six animals from each group were sacrificed 1 and 3 mo after surgery. We determined aneurysm occlusion, the number of struts not in contact with the aorta wall, and the average distance from malapposed struts to aorta wall through histology. RESULTS: No significant differences were found in aneurysm occlusion between the low pore density and high pore density groups (P > .05) after 1 and 3 mo of follow-up. The average number of malapposed struts was lower for the occluded aneurysm group (4.4 ± 1.9) compared to the nonoccluded aneurysm group (7.7 ± 2.6, P < .01). The average distance between malapposed struts and parent artery wall was lower for the occluded aneurysm group (33.9 μm ± 11.5 μm) than for the nonoccluded aneurysm group (48.7 μm ± 18.8 μm, P < .05). CONCLUSION: Wall apposition is more important than pore density for aneurysm occlusion.
Authors: Han San Oh; Jin Woo Bae; Chang-Eui Hong; Kang Min Kim; Dong Hyun Yoo; Hyun-Seung Kang; Young Dae Cho Journal: Front Neurol Date: 2022-06-21 Impact factor: 4.086
Authors: Zeynep Vardar; Robert M King; Afif Kraitem; Erin T Langan; Lindsy M Peterson; Benjamin H Duncan; Christopher M Raskett; Vania Anagnostakou; Matthew J Gounis; Ajit S Puri; Giovanni J Ughi Journal: J Neurointerv Surg Date: 2020-09-28 Impact factor: 8.572