目的:探讨烟雾病性脑出血与高血压性脑出血患者的临床及影像学特征,以及预后和影响因素。方法:回顾性连续纳入2017年1月至2019年1月在神经内科、神经外科住院治疗的烟雾病性脑出血和高血压性脑出血患者。收集患者的人口学资料、临床特...目的:探讨烟雾病性脑出血与高血压性脑出血患者的临床及影像学特征,以及预后和影响因素。方法:回顾性连续纳入2017年1月至2019年1月在神经内科、神经外科住院治疗的烟雾病性脑出血和高血压性脑出血患者。收集患者的人口学资料、临床特征和影像学特征等资料,随访发病后3个月死亡及神经功能结局。将影响脑出血预后的因素作为自变量,3个月不良神经功能结局作为应变量进行logistic回归分析。结果:共纳入30例烟雾病性脑出血患者,同时期按照1:3的比例纳入90例高血压性脑出血患者。烟雾病性脑出血与高血压性脑出血患者相比,年龄较轻、男性及高血压病史比例更低,入院时收缩压、舒张压、美国国立卫生研究院中风量表(National Institutes of Health Stroke Scale,NIHSS)评分及血红蛋白更低、血肿体积更小,发生脑叶及侧脑室出血比例更高(P<0.05)。烟雾病性脑出血患者3个月时不良神经功能结局比例为20.00%,明显低于高血压性脑出血患者(47.78%)。病因(OR=0.27;95%CI:0.10~0.73)、发病年龄(OR=1.05;95%CI:1.02~1.09)、GCS评分(OR=0.76;95%CI:0.67~0.86)、NIHSS评分(OR=1.21;95%CI:1.13~1.32)、呼吸道感染(OR=8.36;95%CI:2.85~24.51)、血肿体积(OR=1.05;95%CI:1.02~1.07)等因素与脑出血3个月不良神经功能相关。结论:烟雾病性脑出血临床特征、影像学特征和预后与高血压性脑出血患者存在显著地差异。在临床工作需完善MRI血管造影、CT血管成像、数字减影血管造影等检查明确脑出血的病因,根据其病因给予特异性的治疗。展开更多
目的对比多系统萎缩(mutiple system atrophy,MSA)患者与健康对照组的血尿酸、肌酐水平,分析MSA与血尿酸、肌酐浓度的关系。方法选取68例中国汉族MSA患者为实验组,70例健康汉族体检者为对照组,比较2组血尿酸、肌酐水平;进一步将MSA分为M...目的对比多系统萎缩(mutiple system atrophy,MSA)患者与健康对照组的血尿酸、肌酐水平,分析MSA与血尿酸、肌酐浓度的关系。方法选取68例中国汉族MSA患者为实验组,70例健康汉族体检者为对照组,比较2组血尿酸、肌酐水平;进一步将MSA分为MSA-P以及MSA-C 2个亚组,比较两亚组之间血尿酸和肌酐水平。结果实验组血尿酸水平明显低于对照组(P<0.01),而实验组肌酐水平与对照组比较无明显差异(P>0.05),MSA-C及MSA-P组间血尿酸及肌酐水平无明显差别(P>0.05)。结论血尿酸与MSA的发病风险呈负相关,调节血尿酸水平可能是潜在的MSA治疗靶点。展开更多
In this paper, the dynamical behavior of entanglement of an uncoupled two-qubit system, which interacts with inde- pendent identical amplitude damping environments and is initially prepared in the extended Werner-like...In this paper, the dynamical behavior of entanglement of an uncoupled two-qubit system, which interacts with inde- pendent identical amplitude damping environments and is initially prepared in the extended Werner-like （EWL） states, is investigated. The results show that whether entanglement sudden death （ESD） of an EWL state will occur or not depends on initial purity and concurrence. The boundaries between ESD states and ESD-free states for two kinds of EWL states are found to be different. Furthermore, some regions are shown where ESD states can be transformed into ESD-free states by local unitary operations.展开更多
The dynamics of distillability entanglement between qutrit-qutrit systems interacting with a thermal reservoir is investigated in this paper. We discovered an interesting phenomenon that under a thermal reservoir cert...The dynamics of distillability entanglement between qutrit-qutrit systems interacting with a thermal reservoir is investigated in this paper. We discovered an interesting phenomenon that under a thermal reservoir certain initially prepared free=entangled states become bound-entangled states in a finite time, which is called distillability sudden death （DSD）. We use a realignment criterion to measure the nine-dimensional density matrix of the entanglement. Moreover, we analyze some other parameters to investigate the effects to the systems. Explanations are then given.展开更多
We study the quantum discord dynamics of two noninteracting qubits that are, respectively, subject to classical noise. The results show that the dynamics of quantum discord are dependent on both the coupling between t...We study the quantum discord dynamics of two noninteracting qubits that are, respectively, subject to classical noise. The results show that the dynamics of quantum discord are dependent on both the coupling between the qubits and classical noise, and the average switching rate of the classical noise. In the weak-coupling Markovian region, quantum discord exhibits exponent decay without revival, and can be well protected by increasing the average classical noise switching rate. While in the strong-coupling non-Markovian region, quantum discord reveals slowly decayed oscillations with quick revival by decreasing the average switching rate of the classical noise. Thus, our results provide a new method of protecting quantum discord in a two-qubit system by controlling the coupling between the qubits and classical noise, and the average switching rate of the classical noise.展开更多
The squeezing dynamics of two independent two-level atoms off-resonantly coupled to two non-Markovian reservoirs is studied by the time-convolutionless master-equation approach. We find that the squeezing of two atoms...The squeezing dynamics of two independent two-level atoms off-resonantly coupled to two non-Markovian reservoirs is studied by the time-convolutionless master-equation approach. We find that the squeezing of two atoms is dependent on both detuning and the non-Markovian effect. Our results show that, in the non-Markovian regime, the bigger the detuning and the stronger the non-Markovian effect are, the larger the strength of the squeezing is. And the squeezing of two atoms can be effectively protected for a long time when both the non-Markovian effect and detuning are present simultaneously. The physical mechanism is that the detuning not only can promote the feedback of information from the environment into the atomic system but also can greatly suppress the atomic decay in the non-Markovian regime.展开更多
文摘目的:探讨烟雾病性脑出血与高血压性脑出血患者的临床及影像学特征,以及预后和影响因素。方法:回顾性连续纳入2017年1月至2019年1月在神经内科、神经外科住院治疗的烟雾病性脑出血和高血压性脑出血患者。收集患者的人口学资料、临床特征和影像学特征等资料,随访发病后3个月死亡及神经功能结局。将影响脑出血预后的因素作为自变量,3个月不良神经功能结局作为应变量进行logistic回归分析。结果:共纳入30例烟雾病性脑出血患者,同时期按照1:3的比例纳入90例高血压性脑出血患者。烟雾病性脑出血与高血压性脑出血患者相比,年龄较轻、男性及高血压病史比例更低,入院时收缩压、舒张压、美国国立卫生研究院中风量表(National Institutes of Health Stroke Scale,NIHSS)评分及血红蛋白更低、血肿体积更小,发生脑叶及侧脑室出血比例更高(P<0.05)。烟雾病性脑出血患者3个月时不良神经功能结局比例为20.00%,明显低于高血压性脑出血患者(47.78%)。病因(OR=0.27;95%CI:0.10~0.73)、发病年龄(OR=1.05;95%CI:1.02~1.09)、GCS评分(OR=0.76;95%CI:0.67~0.86)、NIHSS评分(OR=1.21;95%CI:1.13~1.32)、呼吸道感染(OR=8.36;95%CI:2.85~24.51)、血肿体积(OR=1.05;95%CI:1.02~1.07)等因素与脑出血3个月不良神经功能相关。结论:烟雾病性脑出血临床特征、影像学特征和预后与高血压性脑出血患者存在显著地差异。在临床工作需完善MRI血管造影、CT血管成像、数字减影血管造影等检查明确脑出血的病因,根据其病因给予特异性的治疗。
文摘目的对比多系统萎缩(mutiple system atrophy,MSA)患者与健康对照组的血尿酸、肌酐水平,分析MSA与血尿酸、肌酐浓度的关系。方法选取68例中国汉族MSA患者为实验组,70例健康汉族体检者为对照组,比较2组血尿酸、肌酐水平;进一步将MSA分为MSA-P以及MSA-C 2个亚组,比较两亚组之间血尿酸和肌酐水平。结果实验组血尿酸水平明显低于对照组(P<0.01),而实验组肌酐水平与对照组比较无明显差异(P>0.05),MSA-C及MSA-P组间血尿酸及肌酐水平无明显差别(P>0.05)。结论血尿酸与MSA的发病风险呈负相关,调节血尿酸水平可能是潜在的MSA治疗靶点。
基金supported by the National Natural Science Foundation of China(Grant No.11074072)
文摘In this paper, the dynamical behavior of entanglement of an uncoupled two-qubit system, which interacts with inde- pendent identical amplitude damping environments and is initially prepared in the extended Werner-like （EWL） states, is investigated. The results show that whether entanglement sudden death （ESD） of an EWL state will occur or not depends on initial purity and concurrence. The boundaries between ESD states and ESD-free states for two kinds of EWL states are found to be different. Furthermore, some regions are shown where ESD states can be transformed into ESD-free states by local unitary operations.
基金Project supported by the National Natural Science Foundation of China (Grant No. 11074072)
文摘The dynamics of distillability entanglement between qutrit-qutrit systems interacting with a thermal reservoir is investigated in this paper. We discovered an interesting phenomenon that under a thermal reservoir certain initially prepared free=entangled states become bound-entangled states in a finite time, which is called distillability sudden death （DSD）. We use a realignment criterion to measure the nine-dimensional density matrix of the entanglement. Moreover, we analyze some other parameters to investigate the effects to the systems. Explanations are then given.
基金Projects supported by the National Natural Science Foundation of China(Grant No.11074072)
文摘We study the quantum discord dynamics of two noninteracting qubits that are, respectively, subject to classical noise. The results show that the dynamics of quantum discord are dependent on both the coupling between the qubits and classical noise, and the average switching rate of the classical noise. In the weak-coupling Markovian region, quantum discord exhibits exponent decay without revival, and can be well protected by increasing the average classical noise switching rate. While in the strong-coupling non-Markovian region, quantum discord reveals slowly decayed oscillations with quick revival by decreasing the average switching rate of the classical noise. Thus, our results provide a new method of protecting quantum discord in a two-qubit system by controlling the coupling between the qubits and classical noise, and the average switching rate of the classical noise.
基金Project supported by the Natural Science Foundation of Hunan Province,China(Grant No.09JJ5001)the Science and Technology Plan of Hunan Province,China(Grant No.2010FJ3148)the National Natural Science Foundation of China(Grant No.10374025)
文摘The squeezing dynamics of two independent two-level atoms off-resonantly coupled to two non-Markovian reservoirs is studied by the time-convolutionless master-equation approach. We find that the squeezing of two atoms is dependent on both detuning and the non-Markovian effect. Our results show that, in the non-Markovian regime, the bigger the detuning and the stronger the non-Markovian effect are, the larger the strength of the squeezing is. And the squeezing of two atoms can be effectively protected for a long time when both the non-Markovian effect and detuning are present simultaneously. The physical mechanism is that the detuning not only can promote the feedback of information from the environment into the atomic system but also can greatly suppress the atomic decay in the non-Markovian regime.
