关键词: 脑梗死; 磁共振成像; 症状和体征

Abstract: Objective To study the imaging characters, etiopathogenisis, risk factors, clinical manifestations,vascular lesions and prognosis of posterior circulation infarction.Methods Fifty-three patients with posterior circulation ischemic stroke were admitted to ourdepartment from September 2007 to March 2010 and they were analyzed retrospectively. Allpatients undertake magnetic resonance imaging(MRI) on admission and responsible lesionswere identified in the posterior circulation territories. The patients’ clinical symptoms and signswere evaluated and the relationships between lesion locations and clinical characteristics wereanalyzed. We subdivided the posterior circulation infarcts into proximal, middle, distal andmixed infarcts referring to NEMC-PCR study. The patients were evaluated by modified Rankinscale(mRS) to investigate the relationships between risk factors, lesion locations and prognosis.Results The common symptoms of posterior circulation ischemic stroke were vertigo(52.8%),nausea and vomiting(43.4%), limb paralysis(39.6%), speech difficulty(32.1%);the commonsigns of posterior circulation ischemic stroke were central facial or lingual palsy(58.5%), limbweakness(39.6%), limb sensory loss(32.1%), ataxia(28.3%). The most common risk factors werehypertension, diabetes, smoking, alcohol overuse, cardiopathy, hyperlipemia. The most commonlocation of infarcts was in the middle segment(39.6%), following by distal segment(24.5%), mixed(18.9%) and proximal (17.0%). About 34. 0% of cerebral infarction in posterior circulation havepoor outcome referring to mRS.Conclusion The clinical features of patients with posterior circulation ischemic stroke werecomplex. Predominant symptoms can help to diagnose the posterior circulation ischemic stroke.The most common location of infarcts was in the middle segment. Majority of the patients withposterior circulation ischemic stroke have good prognosis.

Key words: Brain infarction; Magnetic resonance imaging; Symptoms & signs