冠状动脉搭桥术后左室功能的超声评价

冠状动脉搭桥术(CABG)是治疗经药物及介入治疗无效的冠心病的有效方法,对于准确地评价其手术前后的心室功能成为临床心脏病学研究的重要课题。由于超声心动图具有无创、便捷等优点,从而成为目前临床评价心室功能的主要检测方法。本文将对目前用于评价CABG后左室功能的超声心动图诊断研究进展作一综述。1评价技术及其基本原理1.1多普勒组织成像多普勒组织成像(DTI)是一种无创性室壁分析技术,将高速低振幅的血流频移信号滤过而保留低速高振幅的组织频移信号,高速捕获心肌的原始动态信息,实时显示心肌运动的方向与速度。DTI能准确、直观…     

Apopotic gene Bax expression in carotid plaque

The expression of BAX in carotid atherosclcrosis and its regulation is far from defined. Objectives To investigate BAX expression in stable/fibrous and instable/vulnerable carotid plaque and its clinical significance. Methods 25 cases of carotid plaque specimens obtained from endarterectomy were divided into two groups, stable/fibrous 14 cases, vulnerable/instable 11 cases; aortic artery and its branches from hepatic transplantation donors 6 case as control. The expression of proapoptotic BAX was detected by immunohistochemistry (IHC), in situ hybridization(ISH) and in situ TdT dUTP nick end labeling (TUNEL). Results 5 eases of BAX ( ) were detected by ICH and ISH, 4 case of TUNEL ( ) were detected by TUNEL in stable/fibrous carotid plaque, while 10 cases were BAX ( )by IHC(P<0.05) , 11 case by ISH and 9 case by TUNEL were detected in instable/vulnerable carotid plaque (P<0.01), respectively. The intensity of BAX ( ) cells by IHC and ISH was 8.63±2.62 and 10.32±3.12 in fibrous plaques, whereas 122±21.64 and 152±23.35 in vulnerable plaques, respectively. No expression of BAX was found in controlled group. Conclusion The higher expression of Bax in vulnerable carotid plaque may be one mechanisms in molecular pathogenesis of carotid atherosclerosis which affect plaque stability and be the cause of higher incidence of stroke than fibrous carotid plaques, the regulation of BAX expression in different stage of atherosclerosis may provide targets in gene therapy for carotid atherosclerosis.     

β2-ADRENERGIC RECEPTOR GENE POLYMORPHISM IN CHINESE NORTHERN ASTHMATICS

THEβ2-adrenergicreceptor(β2-AR)ishighlyexpre-ssedonairwaysmoothmusclecellsinlung,anddefectsinβ2-ARsignalpathwaywereinvolvedinthepathogenesisofasthma.1 Humanβ2-ARgeneisanintr-onlessgenewithacodingblockconsistingof1239nucleo-tidesonchromosome5q31-32,genome-widesearchforas-thmasusceptibilitylocishowedthatmarkersonthisregionhavebeenlinkedtoasthma-associatedphenotypesinvariousethnicpopulations.2 Reihsausetal3 firstdescribedninecod-ingregionpolymorphisms,particularly,thethreecommonaminoacidsu…     

闹心爱疗,今天你们还吵架吗?

衡量一对夫妻感情的好与坏,人们往往这样或那样来评价:他们俩口子好得不得了,从没红脸,从不吵架……“他们俩口子别提啦.一天到晚吵吵闹闹,从不安宁,还不如离了呢……”。言语之中,无不透露着对恩爱夫妻的羡慕与佩服,对吵嘴夫妻的担忧和嘲讽。一谈及某某夫妻又吵架了,人们仿佛就另眼相看、闻声而起,谈吵色变。 在过去男尊女卑的时代,婚姻中的女人以贤德为美.她们是不能违背丈夫的一言一行的,更别说去吵去闹。但她们小心翼翼维护的家园却仍免不了受到男人的践踏和漠视。如今,新世     

二氯胺基酚诱发的染色体畸变及染毒时间对畸变率的影响研究

２，４－二氯胺基酚（ＤＣＡＰ）是８３—１除草剂在哺乳动物体内的主要代谢产物。本研究以三种染毒计划观察了ＤＣＡＰ诱发Ｖ７９细胞的染色体畸变。结果表明：ＤＣＡＰ是一种染色体损伤剂，诱发的畸变主要为染色单体断裂和交换；３ｈ染毒和染毒后培养１７ｈ诱发的染色体畸变率最高，２０ｈ染毒观察不到染色体畸变，说明以高浓度短期染毒对高细胞毒性化合物的细胞遗传毒性研究可能是较好的染毒方案。     

耐万古霉素肠球菌表型及基因型分析

目的：对耐万古霉素的肠球菌进行表型及基因型分析，了解临床耐万古霉素肠球菌(VRE)的流行状况。指导临床合理使用抗生素。方法：48株肠球菌，按常规方法进行鉴定，并采用琼脂筛选法对耐万古霉素肠球菌进一步筛选。将筛选出的3株耐万古霉素肠球菌，以多重PCR法进行基因分型。结果：共检出3株对万古霉素耐药肠球菌，其中1株为天然耐万古霉素株。基因型分析结果为1株VanA型，1株VanCl型，另1株基因型不明。结论：已发现3株VRE。临床应合理使用抗生素，以防止VRE的爆发流行。     

丽珠肠乐、参苓止泻汤合治婴幼儿腹泻

目的：探讨丽珠肠乐、参苓止泻汤治疗婴幼儿迁延性或慢性腹泻的疗效。方法：将62例患儿随机分为两组，均补液、维持水电解质及酸碱平衡。治疗组用丽珠肠乐、参苓止泻汤，对照组用蒙脱石。7d为1个疗程，观察两组疗效。结果：治疗组的显效率、有效率、总有效率明显优于对照组（P〈0．01）。结论：丽珠肠乐、参苓止泻汤合治婴幼儿迁延性或慢性腹泻疗效满意。     

Propofol and Sevoflurane in Subanesthetic Concentrations Act Preferentially on the Spinal Cord: Evidence from Multimodal Electrophysiological Assessment

Background: Animal experiments in recent years have shown that attenuation of motor responses by general anesthetics is mediated at least partly by spinal mechanisms. Less is known about the relative potency of anesthetic drugs in suppressing cortical and spinal electrophysiological responses in vivo in humans, particularly those, but not only those, connected with motor responses. Therefore, we studied the effects of sevoflurane and propofol in humans using multimodal electrophysiological assessment.

Methods: We studied nine healthy volunteers in two sessions during steady state sedation with 0.5, 1.0, and 1.5 [mu]g/l (targeted plasma concentration) propofol or 0.2 and 0.4 vol% (end-tidal) sevoflurane. Following a 15-min equilibration period, motor responses to transcranial magnetic stimulation and peripheral (H-reflex, F-wave) stimulation were recorded, while electroencephalography and auditory evoked responses were recorded in parallel.

Results: At concentrations corresponding to two thirds of C50 awake, motor responses to transcranial magnetic stimulation were reduced by approximately 50%, H-reflex amplitude was reduced by 22%, F-wave amplitude was reduced by 40%, and F-wave persistence was reduced by 25%. No significant differences between sevoflurane and propofol were found. At this concentration, the Bispectral Index was reduced by 7%, and the middle-latency auditory evoked responses were attenuated only mildly (Nb latency increased by 11%, amplitude PaNb did not change). In contrast, the postauricular reflex was suppressed by 77%.