The Study On The Classification Of Vascular Structure Abnormality In Posterior Circulation Ischemia Patients And Its Clinical Significance

Objective: To observe and analyse the imaging characters of vascular structure abnormalities in posterior circulation ischemia(PCI) patients, and to classify them according to the vascular structure abnormalities, and to investigate the clinical significance of the classification.Methods: All the 306 cases with PCI were taken MRA examination and part of them were taken DSA examination. All the MRA and DSA imagings were observed. The vascular structure abnormalities in 216 cases were analysed and tried to be classified into four types: subclavian artery type, vertibral artery type, basilar artery type, and posterior cerebral artery type. Each type was then classified into 2-5 subtypes.Results: Vertebral artery type was the major type of vascular structure abnormality which accounted for 61.11 % in patients with posterior circulation ischemia. The others were basilar artery type(15.74%), posterior cerebral artery type(12.96%), subclavian artery type(10.19%) in turn. Different types of vascular structure abnormalities existe in different age groups.Conclusions: Posterior circulation ischemia has the specific vascular structure abnormalities, which are the morphologic foundation of ischemic attack. The vascular structure abnormalities were a pathologic base of posterior circulation ischemia. The vertebral artery structure abnormality is the most common etiology of posterior circulation ischemia. Different types of vascular strutures manifested different pathologic types according to the etiology,age and risk factors. The classification of vascular structure abnormality was helpful to PCI clinical diagnosis and treatment.