A model of focal cerebral ischemic infarction was established in dogs through middle cerebral artery occlusion of the right side.Thirty minutes after occlusion,models were injected with nerve growth factor adjacent to...A model of focal cerebral ischemic infarction was established in dogs through middle cerebral artery occlusion of the right side.Thirty minutes after occlusion,models were injected with nerve growth factor adjacent to the infarct locus.The therapeutic effect of nerve growth factor against cerebral infarction was assessed using the hemisphere anomalous volume ratio,a quantitative index of diffusion-weighted MRI.At 6 hours,24 hours,7 days and 3 months after modeling,the hemisphere anomalous volume ratio was significantly reduced after treatment with nerve growth factor. Hematoxylin-eosin staining,immunohistochemistry,electron microscopy and neurological function scores showed that infarct defects were slightly reduced and neurological function significantly improved after nerve growth factor treatment.This result was consistent with diffusion-weighted MRI measurements.Experimental findings indicate that nerve growth factor can protect against cerebral infarction,and that the hemisphere anomalous volume ratio of diffusion-weighted MRI can be used to evaluate the therapeutic effect.展开更多
Purpose: The aim of the present study was to evaluate the diagnostic accuracy for quantification of left ventricular (LV) volumes and LV ejection fraction (LVEF) with current echocardiographic methods of planimetry fo...Purpose: The aim of the present study was to evaluate the diagnostic accuracy for quantification of left ventricular (LV) volumes and LV ejection fraction (LVEF) with current echocardiographic methods of planimetry for analysis of LV remodeling after myocardial infarction in daily clinical routine. Methods: 26 patients were investigated directly after interventional therapy at hospital pre-discharge and at 6 month follow-up. Standardized 2D transthoracic native and contrast echocardiography were performed in all patients. Due to methodological aspects the results of LV volumes and LVEF using native echocardiography were compared to the results of LV opacification (LVO) imaging for analysis in mono-, bi- and triplane data sets using the Simpson’s rule. In addition corresponding multidimensional data sets were analyzed. Results: The assessment of LV volumes and LVEF is more accurate with contrast echocardiography. The comparison of LV volumes and LVEF shows significant increases using contrast echocardiography (p < 0.001). Larger left ventricular end-diastolic volumes (LVEDV) are measured at follow up (p < 0.05). Significant differences (p < 0.001) are found for the determination of LVEDV and LVEF relating to apical mono-, bi-, tri- and multiplane data sets. Standard deviations of the triplane approach, however, are significantly lower than using other modalities. Conclusion: Depending on the localization of the myocardial infarction LV volumes and LVEF are less reliably evaluated using the mono- or biplane approach. According to standardization and simultaneous acquisition of all LV wall segments the triplane approach is currently the best approach to determine LV systolic function. In addition, contrast echocardiography is indicated to improve endocardial border delineation in patients using the triplane or multiplane approach. To our knowledge the present study is the first systematic evaluation of all current possibilities for determination of LV volumes and LVEF by native and contrast echocardiography.展开更多
目的探讨急性脑梗死(ACI)患者弥散加权成像(DWI)病变体积(VDWI)、T2液体衰减反转恢复序列(T2Flair)病变体积(VFlair)与发病时间的关系,及ACI患者DWI与磁敏感加权成像(SWI)区域显示一致程度与预后的关系。方法选取2019年8月至2021年12月...目的探讨急性脑梗死(ACI)患者弥散加权成像(DWI)病变体积(VDWI)、T2液体衰减反转恢复序列(T2Flair)病变体积(VFlair)与发病时间的关系,及ACI患者DWI与磁敏感加权成像(SWI)区域显示一致程度与预后的关系。方法选取2019年8月至2021年12月包钢集团第三职工医院收治的93例ACI患者作为研究对象。运用线性回归分析VFlair、VDWI的体积差与发病时间(T)的关系,分析DWI图像、SWI图像显示区域一致程度与预后的关系。结果线性回归分析结果显示,症状出现6 h内ACI患者VFlair、VDWI与发病时间(T)存在以下关系:(VFlair−VDWI)/VDWI=−0.573+0.103×T;症状出现6~48 h ACI患者VFlair、VDWI与T存在以下关系:(VFlair−VDWI)/VDWI=−0.049+0.013×T。DWI-SWI图像显示区域一致22例,溶栓有效12例(54.55%);DWI-SWI图像显示区域不一致19例,溶栓有效4例(21.05%),两者比较差异有统计学意义(P<0.05)。结论ACI患者VFlair与VDWI差异能有效预测ACI患者发病时间,DWI-SWI区域显示一致程度能够较好预测ACI患者的预后。展开更多
Neuroprotection by ischemic preconditioning has been confirmed by many studies, but the precise mechanism remains unclear. In the present study, we performed cerebral ischemic pre- conditioning in rats by simulating a...Neuroprotection by ischemic preconditioning has been confirmed by many studies, but the precise mechanism remains unclear. In the present study, we performed cerebral ischemic pre- conditioning in rats by simulating a transient ischemic attack twice (each a 20-minute occlusion of the middle cerebral artery) before inducing focal cerebral infarction (2 hour occlusion-reper- fusion in the same artery). We also explored the mechanism underlying the neuroprotective effect of ischemic preconditioning. Seven days after ocdusion-reperfusion, tetrazolium chloride staining and immunohistochemistry revealed that the infarct volume was significantly smaller in the group that underwent preconditioning than in the model group. Furthermore, vascular endothelial growth factor immunoreactivity was considerably greater in the hippocampal CA3 region of preconditioned rats than model rats. Our results suggest that the protective effects of ischemic preconditioning on focal cerebral infarction are associated with upregulation of vascu- lar endothelial growth factor.展开更多
BACKGROUND: Previously, only single short-time low-dose hyperbaric oxygenation (HBO) protocol was administrated to treat acute ischemic stroke in early stage and the conflicting results were obtained. There are few...BACKGROUND: Previously, only single short-time low-dose hyperbaric oxygenation (HBO) protocol was administrated to treat acute ischemic stroke in early stage and the conflicting results were obtained. There are few studies to report the outcome of administering long-time (can cover all the natural pathologic progression period) high-dose HBO to treat the disease. OBJECTIVE: To evaluate the therapeutic effect between two kinds of high-dose hyperbaric oxygenation on super-early stage of acute permanent middle cerebral artery occlusion (MCAO) in rats. DESIGN: A randomized controlled experimental study. SETTING: Beijing Tiantan Hospital, Capital Medical University; Beijing Research Institute of Neurosurgery. MATERIALS: Seventy-four male SD rats, aged 2.5 months old, weighing ( 280 + 20) g, were provided by the Animal Institute, Chinese Academy of Medical Sciences. Hyperbaric oxygenation device was hyperbaric air cabin in which there was a self-made pure oxygen animal experimental cabin (made in China). METHODS: This experiment was carried out in the municipal laboratory of Beijing Tiantan Hospital affiliated to Capital Medical University and Beijing Research Institute of Neurosurgery. ① Experimental intervention: All the rats were developed into models of permanent MCAO by suture embolism. Then, they were randomly divided into two HBO groups (9 hours and 18 hours) and control group, with 24 rats in each as well as 3-hour ultrastructure control group, with 2 rats. After being modeled for 3 hours, rats in the two HBO groups stayed in the hyperbaric cabin for 9 hours and 18 hours, separately. Rats in the 9-hour HBO group inhaled pure oxygen at hours 1, 3, 5, 7 and 9, and hyperbaric air at hours 2, 4, 6 and 8. Rats in the 18-hour HBO group inhaled pure oxygen at hours l, 3, 5, 7, 9, 11, 13, 15 and 17, and hyperbaric air at hours 2, 4, 6, 8, l0 12, 14, 16 and 18. After being created into models, rats in the control group and 3-hour ultrastructure control group breathed room air. ② Experimental evaluation: Neurologic functions of rat models in the 9-hour and 18-hour HBO groups as well as control group were scored by Bederson and Garica two neurological grading systems at hours 14 and 28 and on day 5; Infarct volume of rat models in the two HBO groups and control group was measured at hour 24 and on day 5 with NIH image processing software Image J; The pathological changes of brain tissue in the brain infarct region and its opposite region of rat models in the two HBO groups and 3-hour ultrastructure control group were observed with a Philips EM 208S transmission electron microscope. MAIN OUTCOME MEASURES: ① Neurobehavioral outcome. ② Rat brain infarct volume. ③ Ultrastructure of brain tissue in the ischemic penumbra of infarct models at the different time points RESULTS: ① Neurobehavioral outcome: After treatment, Garica score in the 9-hour and 18-hour HBO groups was significantly higher than that in the control group (P 〈 0.01). Bederson score on day 5 after modeling in the 9-hour and 18-hour HBO groups was significantly lower than that in the control group (P 〈 0.01). ② Cerebral infarct volume: Cerebral infarct volume in the 9-hour and 18-hour HBO groups was significantly smaller than that in the control group at hour 24 and on day 5 after modeling (P 〈 0.01). In the 18-hour HBO group, infarct volume on day 5 after modeling was significantly larger than that at hour 24 after modeling (P 〈 0.05). ③In the 3-hour ultrastructure control group, astrocyte edema and neuron damage around the capillary in the infarct cerebral tissue significantly relieved in the rats which were subjected to HBO. CONCLUSION: High dose of HBO is highly efficient in reducing infarct volume and improving neurobehavioral outcome of rats with acute cerebral infarction, and also has an important role in inhibiting the pathological progression of ischemic brain tissue after cerebral infarction.展开更多
目的探讨老年(年龄60~70岁)急性岛叶梗死患者的梗死部位、梗死体积与临床预后的关系。方法选取2021年2~12月张家口市第一医院老年病科及全科医学科收治的100例老年急性岛叶梗死患者作为研究对象,受试者的脑梗死部位均运用核磁共振成像(m...目的探讨老年(年龄60~70岁)急性岛叶梗死患者的梗死部位、梗死体积与临床预后的关系。方法选取2021年2~12月张家口市第一医院老年病科及全科医学科收治的100例老年急性岛叶梗死患者作为研究对象,受试者的脑梗死部位均运用核磁共振成像(magnetic resonance imaging,MRI)筛查并明确,按Pullicino公式计算其脑梗死体积。根据脑梗死体积大小分组,脑梗死体积<3 cm^(3)组(A组)61例,脑梗死体积≥3 cm^(3)组(B组)39例,利用美国国立卫生院卒中量表(national institutesof health stroke scale,NIHSS)、蒙特利尔认知评估量表(montreal cognitive assessment,MoCA)、脑卒中改良Rankin量表(modifed rankin scale,mRS)、日常生活能力评估量表(activity of daily living scale,ADL)和简易精神状况量表(mini-mental state examination,MMSE)分别评估所有受试者入院时、出院时、出院后的神经功能缺损程度、认知、功能恢复、日常生活能力及精神状态进行综合评估。用秩和检验、Spearman等级相关性检验NIHSS、MoCA、mRS、ADL、MMSE评分与梗死部位、梗死体积的相关性。结果组内比较,A、B组入院时NIHSS、mRS评分依次高于出院时,出院后3、6个月时,MoCA、ADL、MMSE评分及TST剩余值依次低于出院时(P<0.05)。组间比较,A组入院时、出院期(出院时,出院后3、6个月)NIHSS、mRS评分显著低于B组,MoCA、ADL、MMSE评分及TST剩余值显著高于B组(P<0.05)。A组梗死部位(基底核、皮质、脑干、小脑、丘脑、混合病变)的TST剩余值均高于B组(P<0.05)。急性岛叶梗死患者的TST剩余值、NIHSS评分、mRA评分与脑梗死体积呈负相关(rs=-0.358、-0.425、-5.06,P=0.003、0.06、0.09),MoCA、ADL、MMSE评分与脑梗死体积呈正相关(rs=0.547、0.614、0.548,P均<0.001)。结论老年急性岛叶梗死患者的脑梗死部位与神经功能缺损程度、功能恢复呈负相关,与认知、日常生活能力及精神状态呈正相关,其中脑梗死体积与肢体运动功能呈负相关。展开更多
急性脑梗死是常见的缺血性脑血管病,与血小板活性密切相关。血小板活性在急性脑梗死发病、进展、治疗及预后等环节均存在重要影响。平均血小板体积(mean platelet volume,MPV)和血小板分布宽度(platelet distribution width,PDW)是反映...急性脑梗死是常见的缺血性脑血管病,与血小板活性密切相关。血小板活性在急性脑梗死发病、进展、治疗及预后等环节均存在重要影响。平均血小板体积(mean platelet volume,MPV)和血小板分布宽度(platelet distribution width,PDW)是反映血小板活性的两个重要指标,体积大的血小板因能分泌更多的促血栓因子、表达更多的P-选择素和血小板糖蛋白Ⅱb/Ⅲa受体而被认为拥有更高的活性;活化的血小板因伸出大小不一的伪足而使得PDW增大,因此高MPV值和高PDW值都是血小板活化的标志。本文对血小板活化对急性脑梗死的发生、发展及预后等方面的影响进行综述,以期为后续研究血小板活性和急性脑梗死的关系提供参考。展开更多
基金supported by the Hebei Provincial Medical Science Research Key Youth Project,No.20100078
文摘A model of focal cerebral ischemic infarction was established in dogs through middle cerebral artery occlusion of the right side.Thirty minutes after occlusion,models were injected with nerve growth factor adjacent to the infarct locus.The therapeutic effect of nerve growth factor against cerebral infarction was assessed using the hemisphere anomalous volume ratio,a quantitative index of diffusion-weighted MRI.At 6 hours,24 hours,7 days and 3 months after modeling,the hemisphere anomalous volume ratio was significantly reduced after treatment with nerve growth factor. Hematoxylin-eosin staining,immunohistochemistry,electron microscopy and neurological function scores showed that infarct defects were slightly reduced and neurological function significantly improved after nerve growth factor treatment.This result was consistent with diffusion-weighted MRI measurements.Experimental findings indicate that nerve growth factor can protect against cerebral infarction,and that the hemisphere anomalous volume ratio of diffusion-weighted MRI can be used to evaluate the therapeutic effect.
文摘Purpose: The aim of the present study was to evaluate the diagnostic accuracy for quantification of left ventricular (LV) volumes and LV ejection fraction (LVEF) with current echocardiographic methods of planimetry for analysis of LV remodeling after myocardial infarction in daily clinical routine. Methods: 26 patients were investigated directly after interventional therapy at hospital pre-discharge and at 6 month follow-up. Standardized 2D transthoracic native and contrast echocardiography were performed in all patients. Due to methodological aspects the results of LV volumes and LVEF using native echocardiography were compared to the results of LV opacification (LVO) imaging for analysis in mono-, bi- and triplane data sets using the Simpson’s rule. In addition corresponding multidimensional data sets were analyzed. Results: The assessment of LV volumes and LVEF is more accurate with contrast echocardiography. The comparison of LV volumes and LVEF shows significant increases using contrast echocardiography (p < 0.001). Larger left ventricular end-diastolic volumes (LVEDV) are measured at follow up (p < 0.05). Significant differences (p < 0.001) are found for the determination of LVEDV and LVEF relating to apical mono-, bi-, tri- and multiplane data sets. Standard deviations of the triplane approach, however, are significantly lower than using other modalities. Conclusion: Depending on the localization of the myocardial infarction LV volumes and LVEF are less reliably evaluated using the mono- or biplane approach. According to standardization and simultaneous acquisition of all LV wall segments the triplane approach is currently the best approach to determine LV systolic function. In addition, contrast echocardiography is indicated to improve endocardial border delineation in patients using the triplane or multiplane approach. To our knowledge the present study is the first systematic evaluation of all current possibilities for determination of LV volumes and LVEF by native and contrast echocardiography.
文摘目的探讨急性脑梗死(ACI)患者弥散加权成像(DWI)病变体积(VDWI)、T2液体衰减反转恢复序列(T2Flair)病变体积(VFlair)与发病时间的关系,及ACI患者DWI与磁敏感加权成像(SWI)区域显示一致程度与预后的关系。方法选取2019年8月至2021年12月包钢集团第三职工医院收治的93例ACI患者作为研究对象。运用线性回归分析VFlair、VDWI的体积差与发病时间(T)的关系,分析DWI图像、SWI图像显示区域一致程度与预后的关系。结果线性回归分析结果显示,症状出现6 h内ACI患者VFlair、VDWI与发病时间(T)存在以下关系:(VFlair−VDWI)/VDWI=−0.573+0.103×T;症状出现6~48 h ACI患者VFlair、VDWI与T存在以下关系:(VFlair−VDWI)/VDWI=−0.049+0.013×T。DWI-SWI图像显示区域一致22例,溶栓有效12例(54.55%);DWI-SWI图像显示区域不一致19例,溶栓有效4例(21.05%),两者比较差异有统计学意义(P<0.05)。结论ACI患者VFlair与VDWI差异能有效预测ACI患者发病时间,DWI-SWI区域显示一致程度能够较好预测ACI患者的预后。
文摘Neuroprotection by ischemic preconditioning has been confirmed by many studies, but the precise mechanism remains unclear. In the present study, we performed cerebral ischemic pre- conditioning in rats by simulating a transient ischemic attack twice (each a 20-minute occlusion of the middle cerebral artery) before inducing focal cerebral infarction (2 hour occlusion-reper- fusion in the same artery). We also explored the mechanism underlying the neuroprotective effect of ischemic preconditioning. Seven days after ocdusion-reperfusion, tetrazolium chloride staining and immunohistochemistry revealed that the infarct volume was significantly smaller in the group that underwent preconditioning than in the model group. Furthermore, vascular endothelial growth factor immunoreactivity was considerably greater in the hippocampal CA3 region of preconditioned rats than model rats. Our results suggest that the protective effects of ischemic preconditioning on focal cerebral infarction are associated with upregulation of vascu- lar endothelial growth factor.
文摘BACKGROUND: Previously, only single short-time low-dose hyperbaric oxygenation (HBO) protocol was administrated to treat acute ischemic stroke in early stage and the conflicting results were obtained. There are few studies to report the outcome of administering long-time (can cover all the natural pathologic progression period) high-dose HBO to treat the disease. OBJECTIVE: To evaluate the therapeutic effect between two kinds of high-dose hyperbaric oxygenation on super-early stage of acute permanent middle cerebral artery occlusion (MCAO) in rats. DESIGN: A randomized controlled experimental study. SETTING: Beijing Tiantan Hospital, Capital Medical University; Beijing Research Institute of Neurosurgery. MATERIALS: Seventy-four male SD rats, aged 2.5 months old, weighing ( 280 + 20) g, were provided by the Animal Institute, Chinese Academy of Medical Sciences. Hyperbaric oxygenation device was hyperbaric air cabin in which there was a self-made pure oxygen animal experimental cabin (made in China). METHODS: This experiment was carried out in the municipal laboratory of Beijing Tiantan Hospital affiliated to Capital Medical University and Beijing Research Institute of Neurosurgery. ① Experimental intervention: All the rats were developed into models of permanent MCAO by suture embolism. Then, they were randomly divided into two HBO groups (9 hours and 18 hours) and control group, with 24 rats in each as well as 3-hour ultrastructure control group, with 2 rats. After being modeled for 3 hours, rats in the two HBO groups stayed in the hyperbaric cabin for 9 hours and 18 hours, separately. Rats in the 9-hour HBO group inhaled pure oxygen at hours 1, 3, 5, 7 and 9, and hyperbaric air at hours 2, 4, 6 and 8. Rats in the 18-hour HBO group inhaled pure oxygen at hours l, 3, 5, 7, 9, 11, 13, 15 and 17, and hyperbaric air at hours 2, 4, 6, 8, l0 12, 14, 16 and 18. After being created into models, rats in the control group and 3-hour ultrastructure control group breathed room air. ② Experimental evaluation: Neurologic functions of rat models in the 9-hour and 18-hour HBO groups as well as control group were scored by Bederson and Garica two neurological grading systems at hours 14 and 28 and on day 5; Infarct volume of rat models in the two HBO groups and control group was measured at hour 24 and on day 5 with NIH image processing software Image J; The pathological changes of brain tissue in the brain infarct region and its opposite region of rat models in the two HBO groups and 3-hour ultrastructure control group were observed with a Philips EM 208S transmission electron microscope. MAIN OUTCOME MEASURES: ① Neurobehavioral outcome. ② Rat brain infarct volume. ③ Ultrastructure of brain tissue in the ischemic penumbra of infarct models at the different time points RESULTS: ① Neurobehavioral outcome: After treatment, Garica score in the 9-hour and 18-hour HBO groups was significantly higher than that in the control group (P 〈 0.01). Bederson score on day 5 after modeling in the 9-hour and 18-hour HBO groups was significantly lower than that in the control group (P 〈 0.01). ② Cerebral infarct volume: Cerebral infarct volume in the 9-hour and 18-hour HBO groups was significantly smaller than that in the control group at hour 24 and on day 5 after modeling (P 〈 0.01). In the 18-hour HBO group, infarct volume on day 5 after modeling was significantly larger than that at hour 24 after modeling (P 〈 0.05). ③In the 3-hour ultrastructure control group, astrocyte edema and neuron damage around the capillary in the infarct cerebral tissue significantly relieved in the rats which were subjected to HBO. CONCLUSION: High dose of HBO is highly efficient in reducing infarct volume and improving neurobehavioral outcome of rats with acute cerebral infarction, and also has an important role in inhibiting the pathological progression of ischemic brain tissue after cerebral infarction.
文摘目的探讨老年(年龄60~70岁)急性岛叶梗死患者的梗死部位、梗死体积与临床预后的关系。方法选取2021年2~12月张家口市第一医院老年病科及全科医学科收治的100例老年急性岛叶梗死患者作为研究对象,受试者的脑梗死部位均运用核磁共振成像(magnetic resonance imaging,MRI)筛查并明确,按Pullicino公式计算其脑梗死体积。根据脑梗死体积大小分组,脑梗死体积<3 cm^(3)组(A组)61例,脑梗死体积≥3 cm^(3)组(B组)39例,利用美国国立卫生院卒中量表(national institutesof health stroke scale,NIHSS)、蒙特利尔认知评估量表(montreal cognitive assessment,MoCA)、脑卒中改良Rankin量表(modifed rankin scale,mRS)、日常生活能力评估量表(activity of daily living scale,ADL)和简易精神状况量表(mini-mental state examination,MMSE)分别评估所有受试者入院时、出院时、出院后的神经功能缺损程度、认知、功能恢复、日常生活能力及精神状态进行综合评估。用秩和检验、Spearman等级相关性检验NIHSS、MoCA、mRS、ADL、MMSE评分与梗死部位、梗死体积的相关性。结果组内比较,A、B组入院时NIHSS、mRS评分依次高于出院时,出院后3、6个月时,MoCA、ADL、MMSE评分及TST剩余值依次低于出院时(P<0.05)。组间比较,A组入院时、出院期(出院时,出院后3、6个月)NIHSS、mRS评分显著低于B组,MoCA、ADL、MMSE评分及TST剩余值显著高于B组(P<0.05)。A组梗死部位(基底核、皮质、脑干、小脑、丘脑、混合病变)的TST剩余值均高于B组(P<0.05)。急性岛叶梗死患者的TST剩余值、NIHSS评分、mRA评分与脑梗死体积呈负相关(rs=-0.358、-0.425、-5.06,P=0.003、0.06、0.09),MoCA、ADL、MMSE评分与脑梗死体积呈正相关(rs=0.547、0.614、0.548,P均<0.001)。结论老年急性岛叶梗死患者的脑梗死部位与神经功能缺损程度、功能恢复呈负相关,与认知、日常生活能力及精神状态呈正相关,其中脑梗死体积与肢体运动功能呈负相关。
文摘急性脑梗死是常见的缺血性脑血管病,与血小板活性密切相关。血小板活性在急性脑梗死发病、进展、治疗及预后等环节均存在重要影响。平均血小板体积(mean platelet volume,MPV)和血小板分布宽度(platelet distribution width,PDW)是反映血小板活性的两个重要指标,体积大的血小板因能分泌更多的促血栓因子、表达更多的P-选择素和血小板糖蛋白Ⅱb/Ⅲa受体而被认为拥有更高的活性;活化的血小板因伸出大小不一的伪足而使得PDW增大,因此高MPV值和高PDW值都是血小板活化的标志。本文对血小板活化对急性脑梗死的发生、发展及预后等方面的影响进行综述,以期为后续研究血小板活性和急性脑梗死的关系提供参考。