Relationship between intracranial high-density foci and progressive stroke in patients with acute ischemic stroke after intravascular intervention
Objective To investigate the relationship between intracerebral high-density foci and progressive stroke(PS)morbidity by using dual-energy CT,which can quantify the intracerebral high-density foci of patients with acute ischemic stroke after endovascular treatment.Methods Ninety-two patients with acute ischemic stroke who received interventional treatment in Gaozhou People's Hospital from May 2019 to August 2020,and underwent dual-energy CT scan immediately after intervention,were analyzed.The patients were divided into PS group(n=35)and non-PS group(n=57)according to the National Institutes of Health Stroke Scale(NIHSS)score,and the patients whose NIHSS score increased≥4 points within 72 hours of stroke were included in the PS group,while the patients whose NIHSS score increased＜4 points were included in the non-PS group.The clinical data,volume of high-density foci and CT values were compared between the 2 groups.Logistic regression analysis was used to adjust for confounding factors and screen for risk factors.The correlations of the admission NIHSS score,presence and volume of high-density lesions,maximum CT(CTmax)value and average CT(CTave)value with the onset of PS were analyzed,and the receiver operating characteristic curve was used to screen predictive indicators of PS.Results In the PS group,the NIHSS score(18.80±8.50 vs 14.40±9.58,t=2.229,P=0.028),proportion of high-density foci[29/35(82.9％)vs 32/57(56.1％),x2=6.928,P=0.008],high-density focal volume[13.23(39.33)cm3vs 0.76(9.82)cm3,U=1440.000,P＜0.001],CTmax value[80.00(92.00)HU vs 65.00(87.50)HU,U=1 337.000,P=0.005]and CTave value[53.48(23.79)HU vs 45.94(55.11)HU,U=1 345.000,P=0.004]were higher than those in the non-PS group.The NIHSS score(OR=1.054,95％CI1.004-1.106,P=0.033;rs=0.255,95％CI 0.051-0.447,P=0.014),presence of high-density foci(OR=3.776,95％CI 1.358-10.503,P=0.011;rs=0.274,95％CI 0.093-0.460,P=0.008),high-density focal volume(OR=1.026,95％CI 1.003-1.049,P=0.027;rs=0.381,95％CI 0.183-0.560,P＜O.001),CTmax value(OR=1.006,95％CI 1.001-1.011,P=0.014;rs=0.292,95％CI 0.088-0.475,P=0.005)and CTave value(OR=1.021,95％CI 1.007-1.035,P=0.004;rs=0.299,95％CI 0.092-0.484,P=0.004)were all risk factors affecting PS morbidity and were positively correlated with PS morbidity.The area under the receiver operating characteristic curve of NIHSS score,high-density lesion volume,CTmax value,and CTave value to predict the onset of PS was 0.652,0.722,0.670 and 0.674,respectively.The volume of high-density lesions had moderate predictive value for the onset of PS.Conclusions For AIS patients,CT examination should be performed immediately after interventional operation,The volume,CTmax value and CTave value of high-density lesions newly appeared in the ischemic area are positively correlated with the onset of PS.Quantifying the volume of high-density lesions can help to predict the onset of PS.
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