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1.
目的对比研究同型半胱氨酸(homocystein,Hcy)在帕金森病(Parkinson’s disease,PD)和脑梗死患者血浆中的变化,探讨其临床意义。方法检测PD、脑梗死患者及对照组血浆Hcy水平,检测PD、脑梗死患者及对照组血浆叶酸和维生素B_(12)水平。对PD患者血浆Hcy水平与叶酸及维生素B_(12)水平进行相关性分析,对血浆Hcy水平与PD严重程度、病程、临床类型、情绪、认知功能及是否服用美多芭进行相关性分析。结果 (1)PD组、脑梗死组及对照组血浆Hcy水平分别为20±11μmol/L、16±7μmol/L及11±2μmol/L,PD组和脑梗死组血浆Hcy水平均高于对照组,差异有统计学意义(P0.05或0.01),PD组血浆Hcy水平明显高于脑梗死组(P0.01);(2)PD组血浆叶酸和维生素B_(12)水平分别为6±5μg/L和514±345ng/L。PD组血浆叶酸和Hcy水平呈明显负相关(r=-0.453,P0.01);血浆维生素B_(12)和Hcy水平无明显相关性(r=-0.268,P0.05)。(3)按照Hoehn-Yahr分期对PD严重程度进行分组,轻、中、重度PD组血浆Hcy水平分别为16±8μmol/L、21±9μmol/L和35±3μmol/L,三组之间差异有统计学意义(P0.05);(4)血浆Hcy水平与病程、临床类型、情绪、认知功能及是否服用美多芭无关。结论 PD组和脑梗死组血浆Hcy水平明显增高,PD组Hcy水平与疾病严重程度密切相关,PD组血浆叶酸和Hcy水平呈明显负相关。  相似文献   

2.
目的 探讨脑梗死患者血浆硫化氢、同型半胱氨酸(Hcy)、叶酸和维生素B6水平的变化及其相关性.方法 检测60例脑梗死患者和40名正常对照者血浆硫化氢、Hcy、叶酸及维生素B6水平.脑梗死患者血浆硫化氢水平与Hcy、叶酸和维生素B6水平的相关性采用直线相关分析.结果 与正常对照组比较,脑梗死组血浆Hcy水平显著增高,血浆硫化氢、叶酸、维生素B6水平显著降低(P<0.05~0.001).血浆硫化氢水平与Hcy水平呈负相关(r=-0.6271,P<0.01),与叶酸及维生素B6水平呈正相关(r=0.5341,P<0.005;r=0.4615,P<0.05).结论 脑梗死患者血浆硫化氢、叶酸和维生素B6水平明显降低,Hcy水平升高.血浆低硫化氢水平可能参与了高Hcy血症致脑血管病的发病机制,可能是脑血管病的危险因素.  相似文献   

3.
目的 探讨叶酸、Vit B12干预治疗对阿尔茨海默病(AD)患者血浆同型半胱氨酸(Hcy)水平的影响.方法选取广州医学院第二附属医院及广州医学院第五附属医院2010-01-2011-06收治的32例AD患者,测定其血浆Hcy、叶酸、Vit B12水平,予叶酸5 mg/d及Vit B12 500 μg/d干预治疗,8周后检测血浆Hcy、叶酸、Vit B12水平.结果 接受叶酸、Vit B12干预治疗32例AD患者,8周后血浆Hcy水平下降,叶酸及Vit B12水平升高,差异有统计学意义(P均=0.000).结论 叶酸、Vit B12干预治疗能够有效降低AD患者血浆Hcy水平.  相似文献   

4.
脑动脉狭窄与同型半胱氨酸和MTHFR基因多态性的关系   总被引:4,自引:0,他引:4  
目的探讨血浆同型半胱氨酸(Hcy)和5,10-亚甲基四氢叶酸还原酶(MTHFR)两个常见突变位点与脑动脉狭窄的关系。方法选择年龄、性别匹配的病例组80例,对照组55例,采用荧光偏振免疫法(FPIA)测定血浆Hcy水平,聚合酶链反应-限制片段长度多态性(PCR-RFLP)技术进行基因分型。结果病例组和对照组血浆Hcy水平分别为17.18μmol/L和12.54μmol/L,差别显著(P<0.05)。血浆Hcy水平与血管狭窄数目无关。两组MTHFR677TT及T等位基因频率差异均显著(P<0.05),1298AC/CC及C等位基因频率、677CT/1298AC频率均无显著差异。各组内677TT Hcy水平显著高于677CT或677CC型,A1298C突变对Hcy水平无明显影响。结论677TT突变可引起血浆Hcy水平显著升高,与脑动脉狭窄密切相关。A1298C突变对血浆Hcy水平及脑动脉狭窄无显著影响。  相似文献   

5.
目的观察分析不同饮酒量对缺血性脑卒中患者血浆同型半胱氨酸(Hcy)和维生素B12(VitB12)水平的影响。方法我院2009-01-2013-11收治的缺血性脑卒中患者中选取具有长期饮酒史的380例患者以及无饮酒史的100例患者作为研究对象,根据是否饮酒及不同的饮酒量的分为不饮酒组(n=100)、轻度饮酒组(n=125)、中度饮酒组(n=150)和重度饮酒组(n=105),比较各组患者血浆Hcy和VitB12水平进行分析。结果各组患者其血浆Hcy和VitB12的水平差异具有统计学意义,且各组患者表现为高Hcy水平、低VitB12水平及高Hcy合并低VitB12水平的人数分布差异具有统计学意义(P0.05)。结论中度、重度饮酒可使缺血性脑卒中患者体内血浆Hcy水平升高、VitB12水平降低。而不饮酒或适度饮酒不会对患者血浆Hcy和VitB12水平造成明显的影响。  相似文献   

6.
目的探讨饮酒量对缺血性脑血管病患者血浆同型半胱氨酸(Hcy)和维生素B12(VitB12)水平的影响。方法根据450例脑梗死患者的饮酒量,分为不饮酒组、少量饮酒组、中量饮酒组和大量饮酒组。分别采用循环酶法和电化学发光法测定患者的血浆Hcy、VitB12水平。比较各组高Hcy血症(HHcy)、低VitB12的比率,对各组患者的血浆Hcy与VitB12水平进行相关性分析。结果大量饮酒组的HHcy和低VitB12的比率及血浆Hcy水平显著高于其他3组(P0.05~0.01),VitB12水平显著低于其他3组(P0.05~0.01)。中量饮酒组HHcy的比率及血浆Hcy水平显著高于少量饮酒组和不饮酒组(均P0.05)。少量饮酒组与不饮酒组HHcy的比率、血浆Hcy水平,以及中量、少量和不饮酒组之间低VitB12比率、血浆VitB12水平的差异均无统计学意义。大量饮酒组血浆Hcy与VitB12水平呈负相关(r=-4.053,P0.01);其他3组血浆Hcy与VitB12水平无相关性(均P0.05)。结论大量、中量饮酒可升高患者的血浆Hcy水平,大量饮酒降低血浆VitB12水平。不或少量饮酒对血浆Hcy水平,中量及其以下饮酒对血浆VitB12水平无明显影响。  相似文献   

7.
目的探讨血浆同型半胱氨酸(Hcy)水平及其相关代谢酶N5,N10亚甲基四氢叶酸脱氢还原酶(MTHFR)基因多态性与Binswanger病(BD)的关系。方法应用荧光极化免疫法测定77例BD患者和71名健康体检者(健康对照组)的血浆Hcy水平,采用多聚酶链反应限制性片段长度多态性检测MTHFR基因C677T多态性。结果BD组患者血浆Hcy水平为(19.83±2.23)μmol/L,显著高于健康对照组的(13.03±3.79)μmol/L(P<0·01)。BD组和健康对照组间MTHFR各基因型分布和等位基因频率比较差异无显著性(均P>0·05)。各基因型之间血浆Hcy含量差异亦无显著性(均P>0·05)。结论BD患者血浆Hcy水平明显高于健康人,高Hcy血症可能参与了BD的发病过程;而MTHFR基因多态性与BD可能无明显关系。  相似文献   

8.
不同年龄阶段脑卒中患者同型半胱氨酸的初步研究   总被引:1,自引:0,他引:1  
目的研究不同年龄阶段脑卒中患者血浆同型半胱氨酸(Hcy)水平,为预防及治疗脑卒中提供资料。方法观察不同年龄阶段健康者血浆Hcy水平,比较脑梗死以及脑出血患者与相应年龄阶段的健康者血浆Hcy的差异。结果健康对照组以及脑卒中患者Hcy水平均与年龄呈正相关,且脑梗死以及脑出血患者血浆Hcy水平均较相应年龄阶段的健康对照者血浆Hcy水平升高,有显著差异(P<0.05或P<001),脑梗死与脑出血患者血浆Hcy浓度比较差异无统计学意义(P>0.05)。结论血浆Hcy水平随年龄增长而增加,血浆Hcy水平是脑梗死与脑出血的独立危险因素。  相似文献   

9.
MTHFR基因多态性及同型半胱氨酸与青年脑血管病的关系   总被引:4,自引:0,他引:4  
目的:研究Ns,N10-亚甲基四氢叶酸还原酶(MTHFR)基因多态性及血浆同型半胱氨酸(Hcy)水平与青年脑血管病的关系。方法:研究对比40例青年脑血管病患者(首次发病年龄≤50岁)及32例健康青年人的MTHFR基因多态性及血浆Hcy水平。结果:(1)对照组及病例组T/T纯合子率分别为37.5%和22.5%;T等位基因频率分别为60.9%和51.3%,差异均无显著统计意义(均P>0.05)。(2)病例组血浆Hcy几何均值(11.0±2.3μmol/L)显著高于对照组(8.0±1.4μmol/L,P<0.05)。(3)所有受试者中T/T组Hcy值高于C/C组(10.4μmol/L和7.6μmol/L),但差异无显著性(P>0.05)。结合叶酸考虑,进一步将所有受试者按叶酸中位数水平分组。叶酸中位数以下组中,T/T组Hcy值显著高于C/C组(P<0.05);而叶酸中位数以上组中,T/T组Hcy值与C/C组无显著差异。(4)血浆Hcy与叶酸、维生素B12呈显著负相关,与肌酐呈显著正相关。吸烟者血浆Hcy水平显著高于不吸烟者(P<0.05)。结论:(1)本组人群MTHFR基因C677T突变的纯合子在低叶酸状态下可引起血浆Hcy水平显著增高,但与青年脑血管病无显著关系。MTHFR基因677TT纯合突变可能为健康青年人脑血管的保护因素。(2)血浆Hcy水平与青年脑血管病的发生密切相关。(3)叶酸、维生素B12肌酐、吸烟是Hcy的非遗传影响因素。  相似文献   

10.
目的探讨急性脑梗死(ACI)患者同型半胱氨酸(Hcy)与高敏C反应蛋白(hs-CRP)及凝血及纤溶功能的关系。方法选择100例ACI患者(ACI组)并以80例非脑梗死患者为对照(NC组),检测并比较其血浆Hcy、hs-CRP、国际标准化比值(INR)、活化部分凝血活酶时间(APTT)、血浆组织型纤溶酶原激活物(rt-PA)及血浆纤溶酶原激活抑制物-1(PAI-1)。结果 ACI组血浆Hcy、hs-CRP、rt-PA、PAI-1水平比NC组增高,而INR和APTT时间则较NC组缩短,差异有统计学意义(P<0.05)。ACI组血浆Hcy水平与hs-CRP、PAI-1水平呈正相关。结论 ACI患者血浆Hcy水平与hs-CRP、凝血、纤溶功能水平的改变有关。  相似文献   

11.
目的探讨正常成人汉语句子结尾词匹配和非匹配事件相关脑电位(ERP)N400的特点。方法应用ERP仪,对58名19~63岁正常成人右利手受试者,进行汉语正常句子结尾词(匹配)与句子结尾歧义词(非匹配)N400的实验研究。结果正常成人中央区(Cz)、前额区(Fz)及顶区(Pz)脑区汉语句子结尾词匹配的N400平均潜伏期为364ms,平均波幅为8.9μV;非匹配的N400的平均潜伏期为409ms,平均波幅为12.9μV。正常成人各脑区匹配与非匹配的汉语句子结尾词的N400潜伏期、波幅比较有统计学差异。结论正常成人汉语句子识别的N400稳定、可靠;非匹配的汉语句子结尾词的N400潜伏期长,波幅高。  相似文献   

12.
目的 取得本实验室正常成人事件相关脑电位(ERP)N 400实验方法及正常值.方法 应用中国广州润杰WJ-1型ERP仪,对46名20~54岁右利手正常成人受试者,进行汉语成语正常结尾(匹配)与成语结尾歧义词(不匹配)的研究.结果 (1)分析了N 400基本波型,正常成人N 400波形较稳定.(2)建立了Cz、Fz和Pz区域N 400指标平均值.(3)波形分析所见,不匹配结尾词的N 400较匹配的N 400潜伏期较长,波幅高.N 400分布于Fz、Cz和Pz各区.结论 正常成人N 400是可靠的,可作为有临床价值的ERP用于精神科伴有语言障碍疾病的评估.  相似文献   

13.
This study is aimed at constructing the neurophysiological basis for determining the characteristic features of cerebral motor disturbance in representative cerebral palsy (CP) types using topographical S-SEPs technology. Median-nerve stimulated S-SEPs (MN-SSEPs) were examined for 23 patients with four representative types of cerebral palsy: 6 athetotic (including 3 patients due to hypoxic-ischemic encephalopathy (HIE) and 3 to kernicterus), 7 hemiplegic, 5 diplegic and 5 tetraplegic types, and 13 normal controls. In HIE group of athetotic CP, frontal N30 specifically showed severe amplitude reduction or abolishment. In hemiplegic CP, both N20 and N30 on the affected cerebral side tended either to disappear or to be normally evoked at the same time, and their mean amplitudes declined severely. In diplegic CP, the amplitudes of subcortical N18 and parietal N20 were not small but significantly enlarged. N30 amplitude stayed within normal. The reason for this unexpected enlargement of N18 and N20 is unclear, but may be partly due to premature birth which caused abnormally abundant dendritic spine due to absence from perinatal normal spine elimination in the brainstem. In several quadriplegic patients, both N20 and N30 disappeared. The mean amplitude of N30 severely decreased. In conclusion, topographical results of N18, N20 and N30 may basically suggest the underlying involvement of nervous structures in CP according to their representative type.  相似文献   

14.
目的 探讨脑卒中后抑郁症(PSD)患者事件相关电位N400的特征及其影响因索.方法 纳入有和无PSD的脑卒中患者各85例.前者在脑卒中发病后3个月时符合中国精神障碍分类与诊断标准第3版(CCMD-3)抑郁症的诊断标准.给予PSD患者氟西汀治疗3个月.检测所有患者M00和血小板5-羟色胺(5-HT)浓度.结果 治疗前PSD患者N400的潜伏期时间和平均波幅与对照组的差异有统计学意义(P<0.01),而血小板5-HT的浓度明显低于对照组(P<0.01).治疗后PSD患者N400的潜伏期时间和平均波幅较治疗前分别缩短和延长(P<0.01),血小板5-HT的浓度明显上升(P<0.01).PSD组和对照组患者血小板5-HT浓度与N400潜伏期呈负相关(P<0.05),而与N400平均波幅正相关(P<0.05).结论 PSD患者N400的变化以潜伏期明显延长、平均波幅明显缩短为特征,血小板5-HT浓度影响N400的变化.  相似文献   

15.
目的取得本实验室的事件相关脑电位(ERP)-N400实验方法。方法应用中国广州润杰WJ-1型ERP仪,对46名20~54岁右利手正常成人受试者和38名精神分裂症患者,进行汉语成语正常结尾(匹配)与成语结尾歧义词(不匹配)的N400基本波型研究。结果(1)正常成人N400波形较稳定。(2)波形分析所见,结尾词不匹配组的N400较匹配组潜伏期较长,波幅高。(3)精神分裂症组N400潜伏期延长和波幅下降。结论正常成人N400是可靠的,可作为一个有临床价值的ERP而用于精神分裂症及伴有语言障碍疾病的评估。  相似文献   

16.
Nineteen institutionalized patients with frequent seizures (group average two to three per day; seizure types--generalized, akinetic/myoclonic), were treated randomly with either placebo or N,N dimethylglycine (DMG) for 28 days. Dosage was 300 mg/day for the first 14 days and then 600 mg/day. Plasma levels were measured at baseline, days 2, 5, 8, 15, 22, 30, and 1 and 2 weeks after the study ended. No differences in seizure frequency were noted between placebo and DMG or between baseline and test conditions. No toxicity was noted.  相似文献   

17.
《Social neuroscience》2013,8(6):601-620
Numerous studies using the event-related potential (ERP) technique have found that emotional expressions modulate ERP components appearing at different post-stimulus onset times and are indicative of different stages of face processing. With the aim of studying the time course of integration of context and facial expression information, we investigated whether these modulations are sensitive to the situational context in which emotional expressions are perceived. Participants were asked to identify the expression of target faces that were presented immediately after reading short sentences that described happy or anger-inducing situations. The main manipulation was the congruency between the emotional content of the sentences and the target expression. Context-independent amplitude modulation of the N170 and N400 components by emotional expression was observed. On the other hand, context effects appeared on a later component (late positive potential, or LPP), with enhanced amplitudes on incongruent trials. These results show that the early stages of face processing where emotional expressions are coded are not sensitive to verbal information about the situation in which they appear. The timing of context congruency effects suggests that integration of facial expression with situational information occurs at a later stage, probably related to the detection of affective congruency.  相似文献   

18.
The acute effects of single intravenous doses of methylprednisolone sodium succinate (30, 60, or 90 mg/kg) on segmental spinal cord function were examined by stimulating the triceps surae nerves and recording the monosynaptic (2N) and polysynaptic discharges at ventral root L7. Five to ten seconds after injection, an intense but short-lived, spontaneous discharge concomitant with a dose-related reduction in the stimulus-evoked 2N response occurred. This was rapidly followed by enhancement in the 2N discharge amplitude which peaked by 45 s after administration. The duration of the 2N increase was 10 to 60 min. Polysynaptic discharge was augmented to a lesser extent and for a shorter time. The reflex enhancement was reproducible in preparations in which the distally transected dorsal roots were stimulated. All drug-induced responses were prevented by preadministration of 2.5 to 10.0 mg/kg Na pentobarbital i.v. These results indicate that i.v. glucocorticoid enhances mainly monosynaptic transmission perhaps by an action on the primary afferent terminals which augments their spontaneous and evoked transmitter release. Furthermore, they provide additional support for the view that the beneficial effects of glucocorticoids in central nervous system trauma and stroke may in part reflect an improved synaptic function.  相似文献   

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Specific Language Impairment (SLI) is a developmental disorder affecting language learning across a number of domains. These difficulties are thought to be related to difficulties processing auditory speech, given findings of imperfect auditory processing across nonspeech tones, individual speech sounds and syllables. However the relationship of auditory difficulties to language development remains unclear. Perceiving connected speech involves resolving coarticulation, the imperceptible blending of speech movements across adjacent sounds, which gives rise to subtle variations in speech sounds. The present study used event-related potentials (ERPs) to examine neural responses to coarticulation in school age children with and without SLI. Atypical neural responses were observed for the SLI group in ERP indices of prelexical-phonological but not lexical stages of processing. Specifically, incongruent coarticulatory information resulted in a modulation of the N100 in the SLI but not typically developing group while a Phonological Mapping Negativity was elicited in the typically developing but not SLI group, unless additional cues were present. Neural responses to unexpected lexical mismatches indexed by the N400 ERP component were the same for both groups. The results demonstrate a relative insensitivity to important subphonemic features in SLI.  相似文献   

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