We present numerical simulations of blood flow through a brain vascular aneurysm with an artificial stent using Smoothed Particle Hydrodynamics (SPH). The aim of this work is to analyze how the flow into an aneurysm c...We present numerical simulations of blood flow through a brain vascular aneurysm with an artificial stent using Smoothed Particle Hydrodynamics (SPH). The aim of this work is to analyze how the flow into an aneurysm changes using different stent configurations. The initial conditions for the simulations were constructed from angiographic images of a real patient with an aneurysm. The wall shear stresses, pressure and highest velocity within the artery, and other particular quantities are calculated which are of medical specific interest. The numerical simulations of the cerebral circulation help doctors to determine if the patient’s own vascular anatomy has the conditions to allow arterial stenting by endovascular method before the surgery or even evaluate the effect of different stent structure and materials. The results show that the flow downstream the aneurysm is highly modified by the stent configuration and that the best choice for reducing the flow in the aneurysm is to use a completely extended Endeavor stent.展开更多
Objective: To investigate the relationship between electroacupuncture (EA)-induced improvement of regional cerebral blood flow and the alternations of vasoactive intestinal peptide (VIP) and endothelin (ET) in rats wi...Objective: To investigate the relationship between electroacupuncture (EA)-induced improvement of regional cerebral blood flow and the alternations of vasoactive intestinal peptide (VIP) and endothelin (ET) in rats with experimental vascular dementia (VD). Methods: 40 Wistar rats were evenly randomized into sham-operation, model, medication (Nimotone) and EA groups. Vascular dementia model was established by repeated cerebral ischemia-reperfusion which was induced by occlusion and reopen of the bilateral common carotid arteries. EA (2～200 Hz, 2～3 mA) was applied to "Baihui"(GV 20), "Dazhui"(GV 14) and "Zusanli"(ST 36) for 30 min, once daily and continuously for 15 days. The regional cerebral blood flow (rCBF) in parietal lobe and hippocampus was determined with method of hydrogen clearance; a step-down avoidance test was adopted to observe the rats’ behavior change; and plasma VIP and ET contents were assayed by radioimmunoassay. Results: In comparison with sham-operation group, the correct rate of step-down avoidance test, rCBF in parietal lobe and hippocampus and plasma VIP level in VD model group lowered significantly (P<0.01) and plasma ET increased considerably (P<0.01). However, compared with model group, the correct rate of step-down avoidance test, rCBF values and plasma VIP in EA group raised obviously while plasma ET declined significantly. No significant differences were found between EA and medication groups in the 4 indexes. Conclusion: EA can raise rCBF in the parietal lobe and hippocampus, elevate plasma VIP level and reduce plasma ET in rats with VD.展开更多
目的探讨化瘀解痉方联合尼莫地平治疗动脉瘤性蛛网膜下腔出血(Subarachnoid hemorrhage,SAH)后脑血管痉挛患者的疗效及对其血管内皮功能的影响。方法选取2022年1月-2023年1月期间保定市第一中心医院收治的SAH后脑血管痉挛患者90例,按随...目的探讨化瘀解痉方联合尼莫地平治疗动脉瘤性蛛网膜下腔出血(Subarachnoid hemorrhage,SAH)后脑血管痉挛患者的疗效及对其血管内皮功能的影响。方法选取2022年1月-2023年1月期间保定市第一中心医院收治的SAH后脑血管痉挛患者90例,按随机数字表法分为对照组和观察组,每组各45例。对照组给予尼莫地平治疗,观察组在对照组基础上联合化瘀解痉方治疗,均连续治疗15 d。观察两组患者治疗前后神经功能缺损评分(National institute of health stroke scale,NIHSS)、Hunt-Hess分级评分、意识障碍程度评分(Glasgow coma scale,GCS)、血管内皮功能指标[内皮素-1(Endothelin-1,ET-1)、血管内皮生长因子(Vascular endothelial growth factor,VEGF)]、脑血流指标[大脑中动脉平均流速(Mean flow velocity of middle cerebral artery,MCA-Vm)、颈内动脉颅外段平均流速(Mean extracranial velocity of internal carotid artery,VICA-Vm)、脑血管痉挛(Cerebral vasospasm,CAS)指数]改善情况,临床总有效率及不良反应情况。结果治疗后两组患者NIHSS、Hunt-Hess评分均较治疗前降低,GCS评分均较治疗前升高,差异有统计学意义(P<0.05);且观察组NIHSS、Hunt-Hess评分均明显低于对照组,GCS评分明显高于对照组,差异有统计学意义(P<0.05)。治疗后两组患者ET-1、VEGF水平均较治疗前降低,差异有统计学意义(P<0.05);且观察组ET-1、VEGF水平均明显低于对照组,差异有统计学意义(P<0.05)。治疗后两组患者MCA-Vm、VICA-Vm及CAS指数均较治疗前降低,差异有统计学意义(P<0.05);且观察组MCA-Vm、VICA-Vm及CAS指数均明显低于对照组,差异有统计学意义(P<0.05)。治疗后观察组临床总有效率91.11%(41/45)明显高于对照组73.33%(33/45),差异有统计学意义(P<0.05)。治疗期间,两组患者均未发生不良反应,也未出现死亡病例。结论化瘀解痉方联合尼莫地平能够改善SAH后脑血管痉挛患者的血管内皮功能,增加脑血流灌注,减轻神经功能损伤,控制病情发展,疗效显著,安全性高。展开更多
文摘We present numerical simulations of blood flow through a brain vascular aneurysm with an artificial stent using Smoothed Particle Hydrodynamics (SPH). The aim of this work is to analyze how the flow into an aneurysm changes using different stent configurations. The initial conditions for the simulations were constructed from angiographic images of a real patient with an aneurysm. The wall shear stresses, pressure and highest velocity within the artery, and other particular quantities are calculated which are of medical specific interest. The numerical simulations of the cerebral circulation help doctors to determine if the patient’s own vascular anatomy has the conditions to allow arterial stenting by endovascular method before the surgery or even evaluate the effect of different stent structure and materials. The results show that the flow downstream the aneurysm is highly modified by the stent configuration and that the best choice for reducing the flow in the aneurysm is to use a completely extended Endeavor stent.
文摘Objective: To investigate the relationship between electroacupuncture (EA)-induced improvement of regional cerebral blood flow and the alternations of vasoactive intestinal peptide (VIP) and endothelin (ET) in rats with experimental vascular dementia (VD). Methods: 40 Wistar rats were evenly randomized into sham-operation, model, medication (Nimotone) and EA groups. Vascular dementia model was established by repeated cerebral ischemia-reperfusion which was induced by occlusion and reopen of the bilateral common carotid arteries. EA (2～200 Hz, 2～3 mA) was applied to "Baihui"(GV 20), "Dazhui"(GV 14) and "Zusanli"(ST 36) for 30 min, once daily and continuously for 15 days. The regional cerebral blood flow (rCBF) in parietal lobe and hippocampus was determined with method of hydrogen clearance; a step-down avoidance test was adopted to observe the rats’ behavior change; and plasma VIP and ET contents were assayed by radioimmunoassay. Results: In comparison with sham-operation group, the correct rate of step-down avoidance test, rCBF in parietal lobe and hippocampus and plasma VIP level in VD model group lowered significantly (P<0.01) and plasma ET increased considerably (P<0.01). However, compared with model group, the correct rate of step-down avoidance test, rCBF values and plasma VIP in EA group raised obviously while plasma ET declined significantly. No significant differences were found between EA and medication groups in the 4 indexes. Conclusion: EA can raise rCBF in the parietal lobe and hippocampus, elevate plasma VIP level and reduce plasma ET in rats with VD.
文摘目的探讨化瘀解痉方联合尼莫地平治疗动脉瘤性蛛网膜下腔出血(Subarachnoid hemorrhage,SAH)后脑血管痉挛患者的疗效及对其血管内皮功能的影响。方法选取2022年1月-2023年1月期间保定市第一中心医院收治的SAH后脑血管痉挛患者90例,按随机数字表法分为对照组和观察组,每组各45例。对照组给予尼莫地平治疗,观察组在对照组基础上联合化瘀解痉方治疗,均连续治疗15 d。观察两组患者治疗前后神经功能缺损评分(National institute of health stroke scale,NIHSS)、Hunt-Hess分级评分、意识障碍程度评分(Glasgow coma scale,GCS)、血管内皮功能指标[内皮素-1(Endothelin-1,ET-1)、血管内皮生长因子(Vascular endothelial growth factor,VEGF)]、脑血流指标[大脑中动脉平均流速(Mean flow velocity of middle cerebral artery,MCA-Vm)、颈内动脉颅外段平均流速(Mean extracranial velocity of internal carotid artery,VICA-Vm)、脑血管痉挛(Cerebral vasospasm,CAS)指数]改善情况,临床总有效率及不良反应情况。结果治疗后两组患者NIHSS、Hunt-Hess评分均较治疗前降低,GCS评分均较治疗前升高,差异有统计学意义(P<0.05);且观察组NIHSS、Hunt-Hess评分均明显低于对照组,GCS评分明显高于对照组,差异有统计学意义(P<0.05)。治疗后两组患者ET-1、VEGF水平均较治疗前降低,差异有统计学意义(P<0.05);且观察组ET-1、VEGF水平均明显低于对照组,差异有统计学意义(P<0.05)。治疗后两组患者MCA-Vm、VICA-Vm及CAS指数均较治疗前降低,差异有统计学意义(P<0.05);且观察组MCA-Vm、VICA-Vm及CAS指数均明显低于对照组,差异有统计学意义(P<0.05)。治疗后观察组临床总有效率91.11%(41/45)明显高于对照组73.33%(33/45),差异有统计学意义(P<0.05)。治疗期间,两组患者均未发生不良反应,也未出现死亡病例。结论化瘀解痉方联合尼莫地平能够改善SAH后脑血管痉挛患者的血管内皮功能,增加脑血流灌注,减轻神经功能损伤,控制病情发展,疗效显著,安全性高。
