To analyse the rate of intraplaque hemorrhage in symptomatic vertebral artery stenosis by high-resolution MRI / 实用医学杂志

ABSTRACT

Objective To compare the rate of intraplaque hemorrhage between symptomatic and asymptom-atic vertebral artery stenosis groups using high-resolution magnetic resonance imaging(HR-MRI).Methods The patients diagnosed with PCI and with vertebral artery stenosis using HR-MRI were enrolled retrospectively. They were divided into symptomatic and asymptomatic groups according to whether they were detected with PCI by the re-sponsible vertebral artery stenosis before examination. All patients underwent 3D time of flight magnetic resonance angiography(3D TOF MRA)to detect the stenosis location of vertebral artery and the stenosis rate at the narrow-est. T1-weighted fat-suppressed images were positioned on the atherosclerotic plaque that the signal 150% higher than the surrounding muscle was confirmed to be intraplaque hemorrhage. Statistical significance was assessed by chi-square test or Student′s unpaired t test.Results A total of 60 patients were included in this study,28 patients in the symptomatic group and 32 patients in the asymptomatic group.The rate of vertebral artery stenosis in asymp-tomatic group was higher than symptomatic group,but there was no statistical significance[(72 ± 33)% vs.(65 ± 28)%,P=0.383];the number of intraplaque hemorrhage in symptomatic group was significantly higher than that in the asymptomatic group(9 vs.2,P=0.024).Conclusions There is a higher rate of intraplaque hemorrhage in symptomatic vertebral artery stenosis group than asymptomatic group.Intraplaque Hemorrhage could be one of risk factor of acute ischemic cerebral disease.