A case of sudden cardiac death due to mitochondrial disease

A 25-year-old, emaciated man without medical treatment was found to have died suddenly at home by his mother. At autopsy, there were no injuries to his body, but significant circulatory insufficiency was observed. Electron microscopy revealed abnormal mitochondria in cells of the cardiac conduction system. The conduction system was filled with mitochondrial size abnormalities and mitochondrial cristae abnormalities. No notable abnormal findings were observed in other organs. Genetic examination of the blood revealed the mitochondrial pathogenetic variant m.3243A>G. Epileptic seizures, diabetic ketoacidosis, and hyperosmolar hyperglycemic state were unlikely to be the cause of sudden death. The cause of death was diagnosed as arrhythmia possibly induced by the failure of the cardiac conduction system due to mitochondrial disease. This is a rare case of sudden death caused by an accumulation of abnormal mitochondria in the cardiac conduction system.     

消炎痛治疗宫内放环后出血

积极治疗节育手术并发症是搞好计划生育的一个重要环节。月经异常是宫内放置节育环的主要并发症，也是节育环停止使用的主要原因。近几年来本人采用消炎痛治疗官内放环后月经异常，取得了良好的效果。     

Histopathological characterisation of effects of the mouse Pax6 missense mutation on eye development

Mutations in PAX6/Pax6 lead to a variety of ocular anomalies in humans and mice. The aim of the study was to characterise the ocular abnormalities caused by the missense Pax6^Leca4 mutation and compare them to published observations on Pax6 alleles that are functionally equivalent to Pax6⁻ null alleles (such as Pax6^Sey and Pax6^Sey-Neu) and human inherited eye diseases. Ocular features of homozygous Pax6^Leca4/Leca4 and heterozygous Pax6^Leca4/+ embryos at E12.5-E18.5, heterozygous Pax6^Leca4/+ young mice at P18 and heterozygous Pax6^Leca4/+ adults at 12 weeks were analysed histologically with their wild-type Pax6^+/+ littermates. Homozygous Pax6^Leca4/Leca4 fetuses died perinatally with no eyes although an optic cup rudiment with pigmented cells developed. Pax6^Leca4/+ mice were microphthalmic and a range of other severe ocular phenotypes affected both the anterior and the posterior segments. In contrast to Pax6^+/−, the Pax6^Leca4/+ eyes had no goblet cells in the corneal epithelium, the iris was not hypoplastic and there was no lens-corneal epithelial plug. However, microphthalmia was more severe, corneal vascularisation occurred earlier (during fetal stages), pigmented cells were present in the vitreous and corneal stroma and the ciliary body was malformed or abnormal. These results show that, although Pax6^Leca4/+ lacked some eye abnormalities commonly seen in Pax6^Sey/+ and Pax6^Sey-Neu/+ eyes, in most respects their eyes were more severely affected. These differences probably reflect both differences between the Pax6^Leca4 and the Pax6^Sey-Neu mutations and differences in modifier gene expression in different genetic backgrounds. The presence of pigmented cells in the cornea is a novel observation. Some Pax6^Leca4/+ ocular abnormalities were similar to those present in human Peters' anomaly and persistent hyperplastic primary vitreous (PHPV) so Pax6^Leca4/+ mice provide a useful model for some inherited eye diseases.     

可吸收性医用珊瑚人工骨的致突变性研究

目的评价珊瑚人工骨的遗传毒性。方法采用Ames试验;细胞染色体畸变试验和小鼠骨髓细胞微核试验。结果不同浓度的浸提液加与不加S9mix条件下Ames试验;细胞染色体畸变试验以及微核试验与阴性对照组比较无显著差异,结果为阴性。结论在本试验系统条件下,可吸收性珊瑚人工骨无致突变作用。     

132例男性不育患者遗传学病因分析

目的：对男性不育患者进行遗传学病因分析，并探讨其遗传效应。方法：采取132例男性不育患者外周血进行染色体核型分析。结果：132例男性不育患者中，染色体异常24例，染色体变异22例。其中大Y20例，47，XXY18例，45．XY，t(13；14)3例，小Y和46，XY，inv(9)各2例，46，XY，t(9；22)1例。结论：染色体异常是男性不育的重要原因，并建议男性不育患者进行基因诊断，以便确诊是否属于遗传病，为生育提供指导，避免盲目治疗。     

超声心动图与心电图判定左室心肌梗塞部位和范围对比研究

目的:比较二维超声心动图(2DE)和心电图(ECG)对心肌梗塞(MI)定位诊断的异同、优劣。方法:对59例 MI 患者进行了2DE 和 ECG 检查。在2DE 上将左室分为16个节段而分别确定与 ECG 各导联的对应关系,分别计数2DE 上室壁运动异常(WMA)节段数和 ECG 上有异常 Q 波导联所对应节段数,对比分析两种方法检查结果的一致性。结果:2DE 和 ECG 分别检出338和311个节段阳性,两种方法阳性一致率57.9%,两种方法阳性一致率在各壁的高低依次为下壁、前壁、后壁、前间隔、侧壁;两种方法检测结果的差别有显著性(P<0.05);两种方法检测结果的相关系数 r=0.595(P=0.0000)。结论:两种方法的检查结果有较好的一致性,2DE 优于 ECG。     

556例遗传咨询病例细胞遗传学分析

目的 :分析染色体异常与临床疾病的关系。方法 :应用细胞培养染色体分析技术对 5 5 6例遗传咨询病例进行细胞遗传学检查。结果 :发现 47例染色体结构或数目异常 ,占受检人数的 8.4% ,其中常染色体异常 39例 ,性染色体异常 8例。此外检出 46例 ,XY女性反转综合征 2例。结论 :反复自然流产和不孕不育夫妇及怀疑 Down综合征者应进行染色体检查     

糖尿病调脂药物治疗的循证医学

本文重点介绍近年来糖尿病患者调脂治疗,主要包括临床常用的他汀类、贝特类、烟酸等药物降胆固醇(TC)、甘油三酯(TG)、低密度脂蛋白-胆固醇(LDL-C)水平、升高高密度脂蛋白-胆固醇(HDL-C),以及减少心血管事件的疗效、不良反应等。