同型半胱氨酸与高血压的相关性

目的探讨血清同型半胱氨酸（Hcy）与原发性高血压（EH）及其危险因素相关性。方法选择在我院住院及门诊的140例高血压患者作为观察组,另选择在我院接受体检的正常健康人员112例作为对照组,分别测定其血清Hey水平,评价血清同型半胱氨酸水平在高血压发病中的意义。结果高血压患者平均血清同型半胱氨酸（Hcy）水平较健康人明显升高（P〈0．01）,且血压越高,血清Hey浓度越高。结论血清Hcy可能是高血压的一个危险因素。检测血清Hcy水平对原发性高血压的预防及治疗监测具有重要的临床意义。     

高血压并房颤与同型半胱氨酸、踝臂指数的相关性

目的：探讨高血压患者心房颤动（AF）发作与血同型半胱氨酸、踝臂指数的相关性。方法：将120例老年原发性高血压病患者按照有无合并AF发作分为两组：AF组为合并AF发作组65例;对照组为不合并AF发作（窦性心律组）55例,分别做血清同型半胱氨酸浓度和踝臂指数的检测,比较两组血清同型半胱氨酸水平、踝臂指数的高低。结果：高血压并AF组血清同型半胱氨酸浓度明显高于窦性心律组,踝臂指数小于窦性心律组,差异具有统计学意义（P〈0.05）。结论：高血压患者并AF发作有更高的血清同型半胱氨酸水平和更低的踝臂指数。     

原发性高血压病人血清同型半胱氨酸浓度变化的观察

目的进行原发性高血压病人血清同型半胱氨酸浓度变化的观察。方法选取该院于2010年5月—2011年5月收治的100例原发性高血压患者的临床资料,将其分为治疗组,另外再随机采取100名健康者,其中50名属于高血压甲级患者,没有并发症,分为对照A组。另外的50名属于乙级,无并发症者35例,合并心肌梗死10例,合并肾功能不全5例,分为对照B组。最后法用循环酶法Hcy试剂盒检测两组患者的人的血清同型半胱氨酸。结果治疗组血清Hcy水平与无症状对照A组,对比不显著,无统计学意义(P>0.05);对照B组血清HCY水平与其他组患者相比,差异有统计意义(P<0.01)。结论血清同型半胱氨酸水平会影响到高血压的患者病情的转变。     

原发性高血压患者血浆同型半胱氨酸检测意义

目的探讨血浆同型半胱氨酸在原发性高血压患者中检测意义。方法选择我院2011年1月至2012年3月原发性高血压患者80例作为观察组,选择体检健康者80例为对照组,抽空腹静脉血测定血浆同型半胱氨酸水平。结果原发性高血压组血浆同型半胱氨酸水平为14.61±2.77umol/L,对照组为12.43±2.66umol/L,两组比较有统计学意义（P〈0.001）,高血压组中同型半胱氨酸〉15umol/L的35例,占53.75%,对照组13例,占16.25%,两组比较有统计学意义（P〈0.005）。结论高同型半胱氨酸血症是高血压的危险因素之一,检测血浆同型半胱氨酸对高血压的预防、诊断、治疗和病情监控具有重要的临床意义。     

60例高血压患者高同型半胱氨酸与脑中风的关系分析

目的探讨分析60例高血压患者血清中同型半胱氨酸浓度的变化与脑中风的相关性。方法对我院2014年1月—2017年1月收入院进行治疗的60高血压患者的临床资料进行回顾性分析,据患者血清同型半胱氨酸水平,将患者分为观察组和对照组,统计两组患者发生脑中风的情况并进行比较,同时统计分析发生脑中风的患者和未发生脑中风的患者的血清同型半胱氨酸水平差异。结果观察组的脑中风患病率明显高于对照组,差异有统计学意义(P0.05);发生脑中风的患者的血清同型半胱氨酸水平明显高于未发生脑中风的患者血清同型半胱氨酸水平;发生脑中风患者与未发生脑中风患者舒张压和收缩压相比较,差异并不明显,不具有统计学意义。结论在高血压患者中,同型半胱氨酸是脑中风的重要危险因素,血清同型半胱氨酸水平与脑中风的发生率呈现正相关性,积极控制血清同型半胱氨酸水平,可减少脑中风的发生情况,提高患者的生存质量。     

昆明地区血清同型半胱氨酸临床参考范围调查

目的建立昆明地区血清同型半胱氨酸临床参考范围。方法配制同型半胱氨酸低浓度和高浓度血清样本各一份,验证该试剂方法批内和批间不精密度;收集268例表面健康人血清检测血清同型半胱氨酸浓度,建立血清同型半胱氨酸临床参考范围。结果同型半胱氨酸低浓度水平(6.67U/L)血清样本的批内和批间不精密度分别为1.80%和2.91%;高浓度水平(16.18U/L)批内和批间不精密度分别为1.30%和1.54%。268例表面健康人中男性组和和女性组血清同型半胱氨酸浓度进行t检验分析,F=14.585,结果有统计学意义(P<0.01)。男性同型半胱氨酸均值10.53U/L,中位数9.7U/L,参考范围取单侧第95百分位值为16.8U/L;女性同型半胱氨酸均值7.84U/L,中位数7.84U/L,参考范围取单侧第95百分位值为10.6U/L。结论男性和女性表面健康人血清同型半胱氨酸浓度存在显著差异,据此本实验室按性别建立了昆明地区男性和女性血清同型半胱氨酸临床参考范围。     

H型高血压是咋回事?

我母亲因头晕,到医院就诊,经检查血压偏高.进一步检查后医生说母亲患的是"H型高血压".请问,什么是H型高血压? 河南郑州 金明 H型高血压指的是伴有高同型半胱氨酸血症(血浆中同型半胱氨酸浓度高于正常值)的原发性高血压.     

轻中度高血压人群叶酸与同型半胱氨酸水平的相关分析

目的探讨轻中度高血压患者血清叶酸水平与血浆总同型半胱氨酸水平（tHcy）的相关性。方法从哈尔滨、沈阳、北京、西安、上海和南京六城市分析455位28～75岁轻中度原发性高血压患者，测定血清叶酸和血浆同型半胱氨酸水平。结果叶酸水平低于15nmol／L时，叶酸水平越低，tHcy水平越高，高tHcy血症的发生率也越高。结论轻中度高血压患者中，血清叶酸水平与血浆tHcy水平呈负相关。     

西藏地区藏族高血压人群MTHFR基因多态性与同型半胱氨酸水平的相关性研究

目的分析在西藏地区藏族高血压人群中MTHFR C677T基因多态性与同型半胱氨酸水平的关系。方法选取西藏自治区第二人民医院门诊和住院的藏族人群高血压伴同型半胱氨酸浓度≥10μmol/L的患者183名,检测MTHFR C677T基因型,分析其基因多态性,采用多重线性回归进行混杂因素筛选及校正,对校正后的结果与基因型进行相关性分析。结果在183例患者中,CC组、CT组及TT组的比例分别为56.8%、33.3%及9.8%。采用多重线性回归校正后发现,与CC组或CT组相比,TT组与同型半胱氨酸水平呈正相关(β=7.025,P=0.005)。结论本研究结果提示,在西藏地区藏族高血压人群中,MTHFR C677T基因突变可能导致同型半胱氨酸水平的增高。     

原发性高血压与同型半胱氨酸、低密度脂蛋白灼关系

目的：探讨原发性高血压与同型半胱氨酸、低密度脂蛋白的相关性。方法：六安市人民医院门诊和心血管内科住院的172例原发性高血压患者和体检中心健康体检者共185例为研究对象,检测同型半胱氨酸和低密度脂蛋白水平。结果：原发性高血压组HCY、LDL高于健康对照组,差异具有统计学意义（P〈0．05）。结论：同型半胱氨酸和低密度脂蛋白可以作为预测及评估原发性高血压的危险因素。     

妊高征患者亚甲基四氢叶酸还原酶基因多态的检测

目的　探讨妊高征患者亚甲基四氢叶酸还原酶 (MTHFR)基因C6 77T多态与血浆同型半胱氨酸 (Homo cysteine ,Hcy)、叶酸及维生素B12 水平的关系。方法　采用 (PCR -RFLPCPR -restrictionfragmentlengthpolymdor phism)法对 82例妊高征患者 (Hcy血症组和无Hcy血症组 )及 90例正常孕妇 (对照组 )进行MTHFR基因C6 77T等位基因检测 ,并同时测量孕妇血浆中的同型半胱氨酸、叶酸和维生素B12 水平。结果　妊高征组A(Hcy血症组 )纯合变异型T6 77/T6 77频率 (0 34)显著高于妊高征组B(无Hcy血症组 ) (0 11,P <0 0 1)和正常对照组 (0 13,P <0 0 1) ;各组中随 6 77T等位基因数量的增加 ,血浆Hcy水平也增加 ,但是对叶酸和维生素B12 水平没有明显影响。结论　MTH FR基因C6 77T多态可以导致妊高征孕妇血液中同型半胱氨水平升高 ,MTHFR基因C6 77T多态是妊高征发病的遗传危险因素之一     

Dietary and genetic determinants of homocysteine levels among Mexican women of reproductive age

OBJECTIVE: To evaluate the independent and joint effects of dietary folate, vitamin B(12) consumption and methylenetetrahydrofolate reductase (MTHFR) polymorphisms (677C>T and 1298A>C) on the circulating folate and homocysteine (Hcy) levels among Mexican women of reproductive age. DESIGN: A cross-sectional, population-based study. SUBJECTS: The first 130 healthy non-pregnant women (aged 16-34 years) who agreed to participate in a reproductive cohort in Morelos, Mexico. MAIN OUTCOME MEASUREMENTS: Dietary intakes of vitamin B(12) and folate were estimated using a semiquantitative food frequency questionnaire. MTHFR 677C>T and 1298A>C polymorphisms were ascertained using the PCR-based method. Serum levels of Hcy and folate were determined using high-performance liquid chromatography and radioimmunoassay, respectively. RESULTS: Genotype frequencies for the MTHFR 677C>T polymorphism were 21.5% (CC), 52.3% (CT) and 26.2% (TT) among Mexican women. Of the population, 22% had the MTHFR 1298AC genotype, while no individual carried the 1298CC genotype. We observed an increased level of Hcy among carriers of the 677TT genotype, compared to carriers of the 677CC genotype. The highest level of Hcy was observed among MTHFR 677TT carriers with low B(12) intake (<2.0 microg/day), which resulted with a significant interaction (P=0.01). CONCLUSION: Vitamin B(12) is an important determinant of Hcy levels in Mexico. Supplementation of folic acid with vitamin B(12) may be preferable when the MTHFR 677T variant allele is prevalent.     

MTHFR基因C677T位点多态性与胎儿生长受限的相关性

目的:探讨亚甲基四氢叶酸还原酶(MTHFR)基因C677T位点多态性与胎儿生长受限(FGR)的关系。方法:FGR患者62例,正常妊娠妇女65例。聚合酶链反应—限制性内切酶片段长度多肽性(PCR-RFLP)法检测MTHFR C677T基因多态性;荧光偏振免疫法测定血浆总同型半胱氨酸水平;微粒子酶免分析法测定血浆叶酸、VitB12浓度。结果:①FGR组MTHFR C677TC/T基因型频率显著高于正常对照组,C/C基因型频率显著低于对照组,总的突变T等位基因频率显著高于对照组(P<0.05)。②FGR组MTHFRT/T基因型Hcy水平较C/C、C/T基因型患者显著增高,而血清叶酸水平则明显降低(P<0.05)。血清VitB12水平在FGR3种基因型之间差异无显著性(P>0.05)。对照组MTHFR C677T3种基因型之间血清Hcy、叶酸、VitB12,水平差异无显著性(P>0.05)。结论:MTHFR基因C677T位点多态性与FGR有关,高同型半胱氨酸血症是FGR发病的危险因素。     

B-group vitamins, MTHFR C677T polymorphism and carotid intima-media thickness in clinically healthy subjects

OBJECTIVE: Plasma B-group vitamins and age may affect the carotid intima-media thickness (IMT) in subjects with different 677TT genotype of the methylenetetrahydrofolate reductase (MTHFR) gene. DESIGN: A hospital-based cross-study. SETTING: Genomic and Vascular Center, Changhua Christian Hospital, Changhua, Taiwan. SUBJECTS: Five hundred and forty-one clinically healthy subjects. INTERVENTION: Fasting plasma, homocysteine (Hcy), vitamin B(6), vitamin B(12), folate and B-mode carotid ultrasound. RESULTS: MTHFR genotype, plasma concentrations of folate, vitamin B(6) and vitamin B(12) and age were significantly correlated to the plasma Hcy concentration. MTHFR 677TT carriers had higher concentrations of Hcy than did subjects with the CC and CT genotypes. Age, sex, body mass index and plasma Hcy were independent contributors to increase carotid IMT. However, with stratification by mean value of age and B-group vitamins concentrations, we found that at advanced age, lower plasma folate and vitamin B(12) were three risk factors involved in the enhancing effect of the MTHFR 677TT genotype on the increase of plasma Hcy and carotid IMT. CONCLUSION: MTHFR 677TT-related carotid atherosclerosis was only identified in healthy elderly subjects with lower level of plasma folate and vitamin B(12). SPONSORSHIP: Changhua Christian Hospital.     

Folate status and a new repletion cut-off value in a group of healthy Majorcan women

BACKGROUND AND AIMS: Folate status is complex, complicated to assess and we lack consensus for laboratory determination.Total plasma homocysteine (Hcy) is a sensitive marker of folate status. The aim of this study was choosing a plasma total homocysteine (tHcy) measurement method and folate repletion level; assess the mutation C677T frequency for methylenetetrahydrofolate reductase (MTHFR) and the prevalence of hyperhomocysteinemia in healthy Majorcan women. METHODS: The measurement methods were compared using 219 women. Folate status assessment was determined by plasma tHcy, serum and erythrocyte folate and C677T for MTHFR in 342 healthy women. The mutation frequency is established with 146 of them.RESULTS: The measurement method comparison is summarized by Y = 1.013 (IC 95% 0.959, 1.069) X +0.829 (IC 95% 0.485, 1.170). The folate repletion level was set at Hcy < or = 8.6 micromol/l. Women (67.1%) are heterozygotic and do not carry the mutation. Homozygotic frequency is 18.5%, significantly higher in women under 40 years (P = 0.033). Hyperhomocysteinemia prevalence is 19.3%, and 51.7% in the younger group. CONCLUSIONS: Hcy determination by polarized fluorescence immunoassay reflects folate status. Levels < or = 8.6 micromol/l suggest folate repletion, which is less frequent in homozygotes. Population frequency for homozygotic-TT alleles for C677T-MTHFR reductase and hyperhomocysteinemia is significantly higher in women under 40 years.     

Are the associations between life-style related factors and plasma total homocysteine concentration different according to polymorphism of 5,10-methylenetetrahydrofolate reductase gene (C677T MTHFR)? A cross-sectional study in a Japanese rural population

Mild hyperhomocysteinemia is one of the known strong risk factors for atherosclerotic diseases, and therefore it is important to clarify factors that could determine plasma total homocysteine (tHcy) level. A cross-sectional study with a random sample of 455 Japanese rural residents aged 40-69 years was conducted in 2000 to investigate the associations of plasma tHcy concentration with 5,10-methylenetetrahydrofolate reductase (MTHFR) gene and selected life-style related factors. The frequency of the mutant allele, Valine (V) allele, was 0.40 and the prevalence of VV genotype was 14.3%. Plasma tHcy concentration in VV was significantly higher than those in two other genotypes. There were significant inverse associations of plasma tHcy with serum folate and serum vitamin B12 (P<0.001 for trend, respectively); both being stronger in VV than in other genotypes. The number of cigarettes smoked per day was positively associated with plasma tHcy concentration. A multivariate regression analysis revealed that serum folate, serum vitamin B12, and MTHFR genotype were independently associated with plasma tHcy. The inter-individual variance of plasma tHcy was more explained by serum folate and vitamin B12 than by MTHFR genotype. Higher intakes of folate, vitamin B12, and non-smoking may be important to prevent mild hyperhomocysteinemia and the eventual atherosclerotic diseases in this Japanese rural population.     

MTHFR基因多态性对药物联合干预H型高血压血浆Hcy动态监测的影响

目的 研究H型高血压患者服用马来酸依那普利叶酸片对血浆同型半胱氨酸（Hcy）水平的影响及亚甲基四氢叶酸还原酶（MTHFR）基因多态性对该疗效监测的预警作用. 方法 依托深圳南山区脑卒中社区综合防治项目,选取150例H型高血压患者和80例对照者,采用聚合酶链反应-限制性片段长度多态性（PCR-RFLP）法检测MTHFR基因多态性,分析不同基因型Hcy的差异.同时循环酶法测定95例H型高血压患者服用马来酸依那普利叶酸片4周前后血浆Hcy水平变化. 结果 H型高血压组中CC、CT、TT不同基因型Hcy水平差异有统计学意义,尤以TT基因型Hcy水平最高（P＜0.01）.95例H型高血压组采用马来酸依那普利叶酸片进行4周干预后,TT基因型Hcy水平下降幅度最大,差异有统计学意义（P＜0.05）. 结论 H型高血压人群中MTHFR基因677C/T纯合突变TT基因型可能是Hcy升高的重要遗传因素.应用马来酸依那普利叶酸片可有效降低高血压患者发生高Hcy血症的风险,其中以MTHFR基因TT型者为最明显.     

Association between C677T/MTHFR genotype and homocysteine concentration in a Kazakh population

We recently suggested that due to insufficient intake of vegetables, low folate status and mild homocysteinemia might exist in the Kazakh population. To clarify the determinants of homocysteine concentrations among this population, we determined concentrations of serum folate, albumin, creatinine, vitamin B12, and the C677T/ MTHFR genotype in 110 Kazakh individuals and compared these with plasma total homocysteine. In Kazakh, after adjustment for age and sex, folate was correlated with plasma total homocysteine, whereas concentrations in those with the TT genotype was almost twice as high as in those with the CC and CT genotypes (19.7+/-1.8 micromol/L vs. 10.7+/-0.5 micromol/L, p<0.001). Our results suggest that the C677T/MTHFR genotype is associated with homocysteine concentrations in this population and this association might be affected by other factors, such as folate status.     

Homocysteine concentrations in adults with trisomy 21: effect of B vitamins and genetic polymorphisms

BACKGROUND: The effects of supplementation with B vitamins and of common polymorphisms in genes involved in homocysteine metabolism on plasma total homocysteine (tHcy) concentrations in trisomy 21 are unknown. OBJECTIVES: We aimed to determine the effects of orally administered folic acid and of folic acid combined with vitamin B-12, vitamin B-6, or both on tHcy in adults with trisomy 21. The study was also intended to analyze the possible influence of gene polymorphisms. DESIGN: One hundred sixty adults with trisomy 21 and 160 healthy, unrelated subjects aged 26 +/- 4 y were included. Plasma tHcy, red blood cell folate, serum folate, and vitamin B-12 were measured. Genotyping for the common methylenetetrahydrofolate reductase (MTHFR) 677C-->T, MTHFR 1298A-->C, cystathionine beta-synthase 844Ins68, methionine synthase 2756A-->C, methionine synthase reductase 66A-->G, and reduced folate carrier 80G-->A polymorphisms was carried out. RESULTS: The mean tHcy concentration (9.8 +/- 0.7 micromol/L) of cases who did not use vitamins was not significantly different from that of controls (9.4 +/- 0.3 micromol/L). Plasma tHcy concentrations (7.6 +/- 0.3 mmol/L) in cases who used folic acid were significantly lower than in cases who did not. Folic acid combined with vitamin B-12 did not significantly change tHcy concentrations compared with those in cases who used only folic acid. Folic acid combined with vitamins B-6 and B-12 significantly lowered tHcy (6.5 +/- 0.5 micromol/L). The difference in tHcy according to MTHFR genotype was not significant. However, tHcy concentrations were slightly higher in TT homozygotes among the controls but not among the cases. CONCLUSION: This study provides information on the relation between several polymorphisms in genes involved in homocysteine and folate metabolism in adults with trisomy 21.     

Association of B vitamins status and homocysteine levels in elderly Taiwanese

To investigate the relationship between homocysteine (Hcy) and B vitamins status in the Taiwanese elderly population, an analysis was made of the plasma Hcy levels in elderly persons. The study sample was taken from the Elderly Nutrition and Health Survey in Taiwan (1999-2000) (Elderly NAHSIT) and included 1094 males and 1135 females aged 65-90 years. The results showed that average plasma Hcy was 13.3+/-0.6 micromol/ L for males and 10.6+/-0.7 micromol/L for females. The average plasma Hcy levels of males from all age groups were significantly higher than those of females, and significantly increased with age (P<0.0001). The overall prevalence of hyperhomocysteinemia (Hcy>15 micromol/L) was 23.4% for elderly males and 11.2% for elderly females, and this also increased with age (P<0.0001). In subjects with normal renal function, folate, vitamin B2, B6, and B12 status were significantly lower in males with hyperhomocysteinemia, while only folate and vitamin B12 were significantly lower in females with hyperhomocysteinemia. Further analysis suggested that folate, vitamin B6 or B12 insufficiency were associated with hyperhomocysteinemia in both sexes, while vitamin B2 insufficiency was significantly associated only in males. In elderly persons with adequate folate, vitamin B6, and B12 status, there was no significant association between vitamin B2 and hyperhomocysteinemia. This association occurred only in those who had concurrent poor folate, vitamin B6, or B12 status. The strength of the association between vitamin B12 insufficiency and hyperhomocysteinemia was not affected by simultaneous vitamin B2 or B6 insufficiency, but increased about 3-fold when combined with folate. This suggests that poor folate and vitamin B12 status has a synergistic effect on the risk of hyperhomocysteinema in the elderly, as did a poor folate and vitamin B6 status. Therefore, maintaining adequate vitamin B12 status and avoiding multiple B vitamin insufficiency, especially that of folate and vitamin B12 or B6, should be emphasized as an important measure for reducing plasma Hcy levels among elderly Taiwanese.