Polymorphism analysis of four canine MHC class I genes

Abstract: We have studied the variability of four structurally complete dog leukocyte antigen (DLA) class I genes, termed DLA-12, -88, -79 and -64, in a population of mixed breed, unrelated dogs. The human HLA and canine DLA loci share a high degree of similarity in terms of gene structure. This analysis focused on the first three exons of each of four complete canine genes. Exons two and three are the major source of polymorphism in the corresponding human genes. In this analysis, DLA-88 was found to be significantly more polymorphic than the other three genes, with 44 distinct alleles observed among 63 mixed breed, unrelated dogs. The remaining genes had between one and four alleles when examined in 25 dogs. This work was carried out as part of an effort to develop an MHC typing system for the dog, which is critical to the further development of preclinical studies of hematopoietic stem cell and solid organ transplantation in the canine model.     

心脏神经症患者直立倾斜试验探讨

目的:探讨直立倾斜试验(HUTT)对心脏神经症的诊断价值。方法:对59例心脏神经症患者,在排除器质性心脏病后行HUTT。结果:43例呈阳性,阳性发生率为72.9%。不同性别间反应类型有显著差异(P<0.05),女性多见血管抑制型(占76.9%)。不同反应类型间终末血压、心率有明显差异(P<0.05)。结论:HUTT可作为心脏神经症有效的辅助诊断方法。     

心脏机械瓣膜置换术后分娩的临床研究

目的 探讨心脏机械瓣膜置换术后分娩的临床处理措施。方法 对19例心脏机械瓣膜置换手术后妊娠及分娩的资料进行回顾性分忻。结果 19例心脏机械瓣膜置换术后产妇均安全度过孕产期。分娩前后心功能Ⅰ～Ⅲ级，分娩时出血200～260m1，胎儿体重2950--3146g。无母婴死亡者，无胎儿出血以及畸形者。结论 心脏机械瓣膜置换术后心功能Ⅰ～Ⅲ级可安全度过孕产期。分娩采用剖宫产术为宜。妊娠期间口服抗凝剂(华法林)不增加分娩时母婴出血和新生儿畸形。     

Comparison of [I]metaiodobenzylguanidine kinetics with heart rate variability and plasma norepinephrine level

Background. [¹²³I]Metaiodobenzylguanidine (MIBG) imaging has been used to assess cardiac sympathetic nerve abnormalities. We evaluated the clinical significance of myocardial MIBG imaging as a measure of cardiac sympathetic nervous system function by comparing it to heart rate variability and plasma norepinephrine level.Methods and Results. In 211 subjects, we analyzed heart rate variability with 24-hour electrocardiography, performed scintigraphy with MIBG, and measured plasma norepinephrine levels. Time and frequency domain measures of heart rate variability were calculated with the Marquette heart rate variability program (Marquette Electronics, Milwaukee, Wis.). Early and late myocardial MIBG uptakes were measured at 15 and 150 minutes after injection, respectively. MIBG clearance rate from the heart and heart-to-lung and heart-to-mediastinum ratios of MIBG activities were calculated. On the whole, heart rate variability, including low-frequency power, correlated positively, but modestly so, with late MIBG uptake and negatively with MIBG clearance rate. The plasma norepinephrine level correlated negatively with late MIBG uptake and with heart rate variability, including low-frequency power, and positively with MIBG clearance rate. Similar correlations were also observed in patient subgroups with coronary artery disease, diabetes mellitus, and renal failure, but these correlations were weak (R² < 0.5).Conclusions. Increased cardiac sympathetic nervous system activity may be associated with increased myocardial MIBG clearance and decreased heart rate variability, including low-frequency power. Because these associations were not strong, however, the combination of heart rate variability with MIBG may allow an interactive assessment of the cardiac autonomic nervous system.     

心导纳微分环,肺导纳微分环最大向量正常值及其临床意义

本文报道３－５０岁２１４例心导纳微分环（ＣＡＤＬ）和肺导纳微分环（ＰＡＤＬ）最大向量振幅及方位正常值，结果随增龄变化振幅递减，方位递增，多数男＞女，部分组间有差异。４８例左向右分流先心病环体最大向量与肺动脉压之间呈平行关系，并探讨其临床意义。     

Myocardial protection in adult cardiac surgery: current options and future challenges

Current techniques of myocardial protection are evolving with the use of less conventional modalities of cardioplegia and have reduced the morbidity and mortality of cardiac operations. Blood cardioplegic solutions appear superior to cold cardioplegia in terms of myocardial protection and adjuncts as glutamate/aspartate enhancement, antioxidant supplementation, nitric oxide donors and maintenance of calcium homeostasis seem effective. In the near future, further experimental and clinical investigations about pharmacological preconditioning, sodium–hydrogen exchangers inhibition and gene therapy need to be addressed to well define their potential role in the improvement of current techniques of myocardial protection that are suboptimal in high-risk clinical settings.     

人心肌肌钙蛋白T的提取、纯化及鉴定研究

目的 :探究一种简便易行的人心肌肌钙蛋白T(cTnT)的提纯方法并进行鉴定。　方法 :采用匀浆、离心、70℃加热、冰浴、饱和硫酸铵盐析、透析、DEAE 纤维素层析等方法提纯cTnT ,并进行鉴定和免疫活性检测。　结果 :1 0 0g心肌组织中获得cTnT 2 1 .35 6mg ,纯度最高达 91 .7%。　结论 :建立的方法能成功提取纯度较高 ,且具有免疫活性的人心肌cTnT ,为建立适用于临床的cTnT检测方法奠定基础     

The cold pressor test: Vascular and myocardial response patterns and their stability

The purposes of the present study were to compare the cardiovascular response patterns evoked by three versions of the cold pressor test (either forehead stimulation or hand or foot immersion) and to determine the reproducibility of the responses over a 2-week interval. Blood pressure, heart rate, stroke volume, cardiac output, total peripheral resistance, and systolic time intervals were obtained during rest and during the cold pressor test in 42 young men. Across conditions, the pressor response was supported by peripheral resistance increases with concomitant stroke volume decreases. Although the response panerns were generally similar across sites, exceptions were apparent for heart rate. Forehead stimulation was characterized by no significant change in heart rate, whereas limb (hand or foot) immersion was associated with significant heart rate acceleration. The responses elicited by the three cold pressor test conditions were reliable and showed little evidence of attenuation over the test-retest interval.     

人白细胞干扰素诱导慢性乙型肝炎病人DNA损伤修复的探讨

应用不同浓度人白细胞干扰素处理10例慢性乙型肝炎病人外周血淋巴细胞,观察病人姐妹染色单体互换(SCE)频率的动力学变化.结果表明,人白细胞干扰素处理组SCE平均频率明显低于对照组,差异高度显著(P<0.01);慢性迁延性肝炎和慢性活动性肝炎处理组之间SCE平均频率无显著性差异;但人白细胞干扰素处理低浓度组SCE平均频率低于高浓度组,差异不显著(P>0.05).提示人白细胞干扰素具有诱导HBV损伤人体DNA的修复作用;大剂量人白细胞干扰素对HBV损伤人体DNA的修复未必有益.