目的观察血浆同型半胱氨酸(homocysteine,Hcy)对老年急性脑梗死患者预后的影响。方法选择老年急性脑梗死患者377例。根据入院时血浆Hcy水平分为高Hcy血症组251例和对照组126例,观察2组患者的临床特征,神经功能及残疾评定采用美国国立卫...目的观察血浆同型半胱氨酸(homocysteine,Hcy)对老年急性脑梗死患者预后的影响。方法选择老年急性脑梗死患者377例。根据入院时血浆Hcy水平分为高Hcy血症组251例和对照组126例,观察2组患者的临床特征,神经功能及残疾评定采用美国国立卫生研究院脑卒中量表(the national institutes of health stroke scale,NIHSS)和改良Rankin量表评分,所有患者随访至90d,比较2组预后。结果与对照组比较,高Hcy血症组90d时NIHSS评分<4分、入院时及90d时改良Rankin量表评分0～2分的比例明显升高,颈动脉内膜中层厚度明显增厚,差异有统计学意义(P<0.05)。logistic回归分析显示,高Hcy血症是老年急性脑梗死预后不良的独立危险因素(OR=1.473,95%CI:0.878～3.246,P=0.039)。结论高Hcy的老年急性脑梗死患者神经功能缺损更重,预后不良。展开更多
目的探讨640层CT血管成像在缺血性脑血管病中的临床意义。方法选取2010年8月至2011年7月,哈尔滨市第一医院神经内科住院患者31例,使用东芝Aquilion ONE 320排640层动态容积CT进行头颈CTA扫描。结果前循环动脉血管狭窄检出率为40.32%,后...目的探讨640层CT血管成像在缺血性脑血管病中的临床意义。方法选取2010年8月至2011年7月,哈尔滨市第一医院神经内科住院患者31例,使用东芝Aquilion ONE 320排640层动态容积CT进行头颈CTA扫描。结果前循环动脉血管狭窄检出率为40.32%,后循环动脉血管狭窄检出率为39.35%。CTA血管狭窄检出率明显高于磁共振血管成像、经颅多普勒和彩超。结论 320排640层动态容积CTA可以作为检查缺血性脑血管病患者颅内、颅外血管狭窄的可靠方法之一。展开更多
We demonstrate two short-wavelength infrared avalanche photodiodes based on InAs/GaSb superlattice grown by metal-organic chemical vapor deposition.The difference between the two devices,namely,p+n-n+and p+nn-n+,is th...We demonstrate two short-wavelength infrared avalanche photodiodes based on InAs/GaSb superlattice grown by metal-organic chemical vapor deposition.The difference between the two devices,namely,p+n-n+and p+nn-n+,is that the p+nn-n+device possesses an additional middle-doped layer to separate the multiplication region from the absorption region.By properly controlling the electric field distribution in the p+nn-n+device,an electric field of 906 kV/cm has been achieved,which is 2.6 times higher than that in the p+n-n+device.At a reverse bias of-0.1 V at 77 K,both devices show a 100%cut-off wavelength of 2.25μm.The p+n-n+and p+nn-n+show a dark current density of 1.5×10^-7 A/cm^2 and 1.8×10^-8 A/cm^2,and a peak responsivity about 0.35 A/W and 0.40 A/W at 1.5μm,respectively.A maximum multiplication gain of 55 is achieved in the p+nn-n+device while the value is only less than 2 in the p+n-n+device.Exponential nature of the gain characteristic as a function of reverse bias confirms a single carrier hole dominated impact ionization.展开更多
文摘目的观察血浆同型半胱氨酸(homocysteine,Hcy)对老年急性脑梗死患者预后的影响。方法选择老年急性脑梗死患者377例。根据入院时血浆Hcy水平分为高Hcy血症组251例和对照组126例,观察2组患者的临床特征,神经功能及残疾评定采用美国国立卫生研究院脑卒中量表(the national institutes of health stroke scale,NIHSS)和改良Rankin量表评分,所有患者随访至90d,比较2组预后。结果与对照组比较,高Hcy血症组90d时NIHSS评分<4分、入院时及90d时改良Rankin量表评分0～2分的比例明显升高,颈动脉内膜中层厚度明显增厚,差异有统计学意义(P<0.05)。logistic回归分析显示,高Hcy血症是老年急性脑梗死预后不良的独立危险因素(OR=1.473,95%CI:0.878～3.246,P=0.039)。结论高Hcy的老年急性脑梗死患者神经功能缺损更重,预后不良。
文摘目的探讨640层CT血管成像在缺血性脑血管病中的临床意义。方法选取2010年8月至2011年7月,哈尔滨市第一医院神经内科住院患者31例,使用东芝Aquilion ONE 320排640层动态容积CT进行头颈CTA扫描。结果前循环动脉血管狭窄检出率为40.32%,后循环动脉血管狭窄检出率为39.35%。CTA血管狭窄检出率明显高于磁共振血管成像、经颅多普勒和彩超。结论 320排640层动态容积CTA可以作为检查缺血性脑血管病患者颅内、颅外血管狭窄的可靠方法之一。
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61874179,61804161,and 61975121)the National Key Research and Development Program of China(Grant No.2019YFB2203400).
文摘We demonstrate two short-wavelength infrared avalanche photodiodes based on InAs/GaSb superlattice grown by metal-organic chemical vapor deposition.The difference between the two devices,namely,p+n-n+and p+nn-n+,is that the p+nn-n+device possesses an additional middle-doped layer to separate the multiplication region from the absorption region.By properly controlling the electric field distribution in the p+nn-n+device,an electric field of 906 kV/cm has been achieved,which is 2.6 times higher than that in the p+n-n+device.At a reverse bias of-0.1 V at 77 K,both devices show a 100%cut-off wavelength of 2.25μm.The p+n-n+and p+nn-n+show a dark current density of 1.5×10^-7 A/cm^2 and 1.8×10^-8 A/cm^2,and a peak responsivity about 0.35 A/W and 0.40 A/W at 1.5μm,respectively.A maximum multiplication gain of 55 is achieved in the p+nn-n+device while the value is only less than 2 in the p+n-n+device.Exponential nature of the gain characteristic as a function of reverse bias confirms a single carrier hole dominated impact ionization.
