A canine model of mechanical thrombectomy in stroke
New England Center for Stroke Research, Department of Radiology
Animal Experimentation and Research | Cardiovascular Diseases | Cardiovascular System | Nervous System Diseases | Radiology | Surgery | Surgical Procedures, Operative | Veterinary Medicine
PURPOSE: To develop a preclinical model of stroke with a large vessel occlusion treated with mechanical thrombectomy.
MATERIALS AND METHODS: An ischemic stroke model was created in dogs by the introduction of an autologous clot into the middle cerebral artery (MCA). A microcatheter was navigated to the clot and a stent retriever thrombectomy was performed with the goal to achieve Thrombolysis in Cerebral Ischemia (TICI) 2b/3 reperfusion. Perfusion and diffusion MRI was acquired after clot placement and following thrombectomy to monitor the progression of restricted diffusion as well as changes in ischemia as a result of mechanical thrombectomy. Post-mortem histology was done to confirm MCA territory infarct volume.
RESULTS: Initial MCA occlusion with TICI 0 flow was documented in all six hound-cross dogs entered into the study. TICI 2b/3 revascularization was achieved with one thrombectomy pass in four of six animals (67%). Intra-procedural events including clot autolysis leading to spontaneous revascularization (n=1) and unresolved vasospasm (n=1) accounted for thrombectomy failure. In one case, iatrogenic trauma during microcatheter navigation resulted in a direct arteriovenous fistula at the level of the cavernous carotid. Analysis of MRI indicated that a volume of tissue from the initial perfusion deficit was spared with reperfusion following thrombectomy, and there was also a volume of tissue that infarcted between MRI and ultimate recanalization.
CONCLUSION: We describe a large animal stroke model in which mechanical thrombectomy can be performed. This model may facilitate, in a preclinical setting, optimization of complex multimodal stroke treatment paradigms for clinical translation.
intervention, stroke, thrombectomy
DOI of Published Version
J Neurointerv Surg. 2019 May 18. pii: neurintsurg-2019-014969. doi: 10.1136/neurintsurg-2019-014969. [Epub ahead of print] Link to article on publisher's site
Journal of neurointerventional surgery
Brooks OW, King RM, Nossek E, Marosfoi MG, Caroff J, Chueh J, Puri AS, Gounis MJ. (2019). A canine model of mechanical thrombectomy in stroke. Radiology Publications and Presentations. https://doi.org/10.1136/neurintsurg-2019-014969. Retrieved from https://escholarship.umassmed.edu/radiology_pubs/475