Clinical Application Of Susceptibility-weighted Imaging In The Mechanical Thrombectomy Postoperation Of Acute Middle Cerebral Artery Occlusion

Objective To evaluate the value of susceptibility-weighted imaging (SWI) in the mechanical thrombectomy postoperation of acute middle cerebral artery occlusion.Methods From July2012to December2012, mechanical thrombectomy by Solitaire AB stent was carried out in21patients with acute middle cerebral artery occlusion. All the patients, onset time less than4～7hours, and cerebral angiography displayed that successful recanalization was obtained in MCA. There is no intracranial hemorrhage occurred in intraoperative DynaCT. The clinical results were evaluated with CT, MR and SWI examination on the first, third and seventh day after treatment. Micro-bleeding showed the difference in the lesions of conventional and susceptibility-weighted imaging.Results On the third postoperative day, SWI sequences clearly exhibited dot-, stripe-, round-or ring-shaped low signal shadows in16patients. However, CT and MRI conventional sequences detected3cases and8cases of micro-bleeding in the21patients on the first and third postoperative day.Conclusion Susceptibility-weighted imaging has distinct advantages over the conventional sequence in the diagnosis of intracranial lesions of micro-bleeding. It can direct the medical treatment of the mechanical thrombectomy postoperation as well as providing imaging basis for individualization of anticoagulant and antiplatelet therapy. SWI is promisingly to be an effective evaluation method for the treatment and prognosis of the patients with acute middle cerebral artery occlusion.