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1.
高同型半胱氨酸血症及其相关因素与青年脑梗死的关系   总被引:6,自引:0,他引:6  
目的探讨同型半胱氨酸(homocysteine,Hcy)及其相关因素与青年脑梗死的关系。方法比较40例青年脑梗死患者(初发年龄<=45岁),30例神经系统非血管性疾病(NVD)患者和30例健康人血浆Hcy水平。分析年龄、性别、体重指数、肝肾功能、吸烟、嗜酒、血清VitBl2、叶酸水平的影响。结果脑梗死组血浆Hcy水平(21.4±18.8umol/L)分别与神经系统非血管疾病组(10.2±5.0umol/L)和健康对照组(12.9±8.6umol/L)比较差异均有显著性(P<0.01)。叶酸、VitB12与Hcy呈负相关,二者的降低与青年脑梗死关系密切(P<0.01)。血肌苷增高和吸烟与Hcy增高有关(P<0.05)。男性Hcy显著高于女性(P<0.05)。结论Hcy和青年脑梗死密切相关,与叶酸、VitBl2呈负相关,与肌苷呈正相关。男性、吸烟也与Hcy增高有关。  相似文献
2.
Seizures Induced by Homocysteine in Rats During Ontogenesis   总被引:5,自引:5,他引:3  
Summary: We studied the convulsant action of homocysteine in 211 immature and adult Wistar albino rats. Homocysteine elicited minimal, predominantly clonic, and major generalized tonic-clonic seizures at six different developmental stages, from 7 days to adulthood. Nevertheless, some age-dependent differences in the seizure pattern were apparent. Minimal seizures in immature rats lasted ≤20 min, thus representing an epileptic status, whereas in adult animals these seizures were much shorter, lasting only ≥40 s. In addition, flexion seizures were observed in 7-and 12-day-old rats, only rarely in 15-and 18-day-old animals, and never in the 25-day-old and adult rats. ECoG recordings demonstrated a nearly iso-electric pattern during homocysteine-induced seizures in 7-and 12-day-old rat pups. In older rats, spikes or sharp waves were recorded, but precise electroclinical correlations were poor. The greater sensitivity of younger animals to kainic acid (KA) and N-methyl-D-aspartate (NMDA), as reported previously, was not evident in the case of homocysteine-induced seizures. This observation, together with a different behavioral pattern, suggests that homocysteine cannot be considered a simple agonist of the kainate or NMDA type of excitatory amino acid receptors. The exact mechanism of the convulsant action of homocysteine, both during development and in adulthood, remains to be clarified.  相似文献
3.
血浆同型半胱氨酸与动脉粥样硬化及脑梗死的相关性分析   总被引:5,自引:2,他引:3  
目的探讨血浆同型半胱氨酸水平与动脉粥样硬化及脑梗死的关系。方法选114例动脉粥样硬化性脑梗死患者为脑梗死组,同期选择年龄性别相匹配的健康体检者51例为对照组。根据颈动脉多普勒彩色超声检查结果将脑梗死组分为脑梗死有斑块组和脑梗死无斑块组,将对照组分为对照有斑块组和对照无斑块组;脑梗死有斑块组和对照有斑块组合称斑块组,脑梗死无斑块组和对照无斑块组合称无斑块组。所有研究对象均测定血浆同型半胱氨酸(homocysteine,HCY)水平,应用颈动脉多普勒彩色超声检查患者颈动脉内膜中层厚度(intimal-medial wall thickness,IMT)。结果动脉粥样硬化性脑梗死患者血浆同型半胱氨酸、颈动脉内膜中层厚度均较对照组增高,差异有统计学意义(P〈0.05);斑块组血浆Hcy、IMT水平均高于无斑块组,且有统计学差异(P〈0.05);脑梗死有斑块组血浆Hcy、IMT水平高于对照有斑块组,脑梗死无斑块组血浆Hcy、IMT水平高于对照组有斑块组,但均无统计学差异(P〉0.05);直线相关分析显示血浆Hcy水平与IMT呈正相关(r=0.70,P<0.05)。结论血浆HCY水平与动脉粥样硬化关系密切,可能是动脉粥样硬化的危险因素,但与脑梗死关系不明确。  相似文献
4.
同型半胱氨酸与脑出血关系探讨   总被引:5,自引:3,他引:2  
目的探讨脑出血与同型半胱氨酸(Hcy)的关系。方法选取脑出血患者58例,另选对照者60例,分别测定血浆Hcy、叶酸和维生素B12浓度。结果脑出血组的血浆Hcy水平较对照组明显升高,脑出血组Hcy与叶酸水平呈显著负相关,与VitB12水平呈负相关。结论高Hcy血症与脑出血呈正相关;血浆Hcy水平与叶酸、VitB12水平呈负相关。  相似文献
5.
Hyperhomocysteinemia is a risk factor of middle cerebral artery stenosis   总被引:5,自引:0,他引:5  
Purpose Hyperhomocysteinemia (HHcy) is considered to be an independent risk factor for atherosclerosis. We aimed to determine the relation between Hcy and cerebral artery stenosis in a large Chinese population. Methods We present data concerning 2,500 residents. Plasma was saved from 1,020 residents who were asymptomatic. Hcy concentration was measured by fluorescence ration biochemical assay kit, and middle cerebral artery (MCA) was assessed by Transcranial Doppler in these subjects. Results Fifty-six residents with MCA stenosis were included in this study. The remained 964 residents without stenosis were control. Analysis of the data revealed that the plasma concentration of Hcy (18.33 ± 5.34 μmol/L), age (63.9 ± 12.9) and systolic pressure (142.6 ± 22.6 mmHg) in the stenotic group were increased (p < 0.0001) compared with the control group (Hcy12.95 ± 4.57 μmol/L, age 55.8 ± 10.9, systolic pressure 126.3 ± 20.3 mmHg). Based on logistic regression, 5 factors emerged as independent predictors of MCA stenosis: Hcy (OR = 1.16, 95%confidence interval 1.14–1.26), male (OR = 2.63, 95%CI 1.49–4.66), age (OR = 1.04, 95%CI 1.01–1.07), hypertension (OR = 9.16, 95%CI 4.57–18.35), diabetes mellitus (OR = 5.90, 95%CI 3.09–11.29). Conclusion Hyperhomocysteinemia might be one of the risk factors for cerebral artery stenosis. It may play a role in atherosclerosis and thrombosis. Received in revised form: 28 May 2006  相似文献
6.
目的研究血清同型半胱氨酸(homocysteine,Hcy)水平与脑梗死发生及其与颈动脉粥样硬化(atherosclerosis,AS)的关系。方法收集162例脑梗死患者、40例健康对照者血液标本,采用荧光偏振免疫法测定Hcy,同时对患者进行血压、空腹血糖、血脂和纤维蛋白原测定。并对94例患者作颈动脉彩色超声检查,比较脑梗死组与对照组、颈动脉硬化组与颈动脉正常组血清Hcy水平变化。结果脑梗死组和对照组血清Hcy水平升高分别有98例和5例,占60.49%和12.50%,血清Hcy水平分别为17.86±7.32μmol/L和12.05±3.33μmol/L,两组比较差异有统计学意义(均P<0.001)。脑梗死组中伴颈动脉粥样硬化的患者Hcy水平明显高于无颈动脉粥样硬化者(P<0.05)。脑梗死患者Hcy水平与血脂无相关性,与颈动脉内膜中层厚度(intimal-media thickness,IMT)呈显著正相关性(r=0.463,P<0.001)。结论高Hcy血症是脑梗死的独立危险因素,与颈动脉粥样硬化及斑块形成有关,为防治缺血性脑卒中提供新的理论依据。  相似文献
7.
血浆同型半胱氨酸水平与缺血性脑血管的相关性研究   总被引:4,自引:1,他引:3  
目的 研究脑梗死患者血清同型半胱氨酸( homocysteine, Hcy)水平的变化,观察同型半胱氨酸在脑梗死各亚型之间的差异及与其他传统危险因素的关系.方法 对220例脑梗死患者利用高效液相色谱荧光法,测定血浆Hcy水平,并进行比较及相关分析.结果 脑梗死患者中高同型半胱氨酸血症与肌酐水平呈正相关,与性别、年龄、血脂水平、凝血时间、纤维蛋白原及尿酸水平无显著相关性,与脑梗死的OSCP分型无关.结论 脑梗死患者中高同型半胱氨酸血症与肌酐水平呈正相关,与脑梗死的传统危险因素无关.  相似文献
8.
Abnormalities of homocysteine and B vitamins in the nephrotic syndrome   总被引:4,自引:0,他引:4  
INTRODUCTION: The nephrotic syndrome is associated with heightened risk for arterial and venous thrombosis. Multiple derangements of hemostasis and acquired risk factors such as hyperlipidemia and hypertension contribute to this risk. The prevalence in the nephrotic syndrome of high circulating levels of homocysteine and of low levels of the B vitamins that are involved in its metabolism, which may play a role in thrombosis, is not well defined. MATERIALS AND METHODS: In 84 patients with nephrotic syndrome and 84 sex- and age-matched controls, hemostasis variables and the circulating levels of total homocysteine (tHcy), vitamin B(6), B(12) and folates were measured. RESULTS: tHcy levels were higher, vitamin B(6) and vitamin B(12) levels were lower in nephrotic patients than in controls. The association of low vitamin B(6) levels with the nephrotic syndrome was independent of any other alteration associated with the disease. Eighty-two percent of patients with the nephrotic syndrome had vitamin B(6) levels falling in the lowest quartile of the normal distribution. Antithrombin deficiency, factor V Leiden, antiphospholipid antibodies, hypertension, dyslipidemia, were more frequent in patients with the nephrotic syndrome than in controls. CONCLUSIONS: Patients with the nephrotic syndrome have multiple risk factors for thrombosis. We report that they frequently have low circulating levels of vitamin B(6), which associate with a heightened risk for venous and arterial thrombosis.  相似文献
9.
High plasma levels of homocysteine (Hcy) may predispose to ischemic stroke (IS), but results of previous studies have been conflicting. We decided to determine in IS patients whether their Hcy levels are elevated, whether levels vary at different time points following stroke, whether levels are associated with stroke severity, outcome, recurrence, etiology, infarct volume, or risk factors, and whether levels are correlated with hemostatic factors or C-reactive protein values. We measured plasma Hcy levels in 102 consecutive IS patients on admission and at 1 week, 1 month, and 3 months after stroke and once in 102 control subjects. Hemostatic factors were measured in 55 patients. Compared with controls, plasma Hcy levels in patients were significantly lower on admission but not at later time points, with levels increasing by week and remaining at this level for 3 months. Hcy levels showed a positive correlation with age and a negative correlation with Mini-Mental State Examination (MMSE) scores. Plasma Hcy levels inversely correlated with plasminogen activator inhibitor type-1. Decreased Hcy levels on admission may reflect the strength of the acute-phase response rather than a pathogenetic event. The negative correlation between Hcy levels and MMSE scores is more probably age-related than stroke-related.  相似文献
10.
Adenosinergic Modulation of Homocysteine-Induced Seizures in Mice   总被引:3,自引:3,他引:3  
Homocysteine thiolactone (HTL) elicits seizures in mice at a dose of 850 mg/kg (95-100% of animals) with an average latency time of 19.5 min. These seizures are reversed by both 5' N-ethylcarboximide adenosine (NECA) and flunitrazepam, with respective ED50 doses of 0.025 and 0.20 mg/kg. NECA was approximately four-fold more potent as an inhibitor of HTL-induced seizures than of seizures induced by pentylenetetrazol (PTZ, 75 mg/kg). Flunitrazepam was equipotent in both seizure paradigms. The purine precursor 5-amino-4-imidazole carboxamide riboside, (AICAr), although virtually ineffective against PTZ-induced seizures at doses greater than 1 g/kg, was able to inhibit HTL-induced seizures with an ED50 of approximately 350 mg/kg. The anticonvulsant effect of AICAr was dose and time dependent. The anticonvulsant potency of AICAr was increased by simultaneous administration of the adenosine uptake blocker Mioflazine, whereas the central nervous system (CNS)-impermeable adenosine uptake blocker dipyridamole had no effect. The ability of AICAr to permeate the blood-brain barrier (BBB) is limited (less than 1%) and may explain its low potency as an anticonvulsant. AICAr also has very low potency at brain adenosine A1 and A2 receptors as well as adenosine uptake sites (IC50 greater than 10(-3) M), suggesting that its anticonvulsant properties are not mediated by direct action at these sites. The results indicate that AICAr does have frank anticonvulsant effects and further suggest that HTL-induced seizures may represent a useful paradigm for evaluation of adenosinergic agents. AICAr or more potent derivatives thereof may represent a new class of anticonvulsants with the ability to target seizure foci selectively.  相似文献
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