Meteorological factors and the time of onset of chest pain in acute myocardial infarction

Analysis of the time of onset of chest pain in 2254 patients with a myocardial infarction admitted to a coronary care unit in Leicester during a 10-year period shows an association with temperature and humidity. During both the most cold and humid times of the year, the relationship is a strong one. A generalized linear model with a log link was used to fit the data and the backward elimination selection procedure suggested a humid, cold day might help to trigger the occurrence of myocardial infarction. In addition, cold weather was found to have a stronger effect on the male population while those men aged between 50 and 70 years were more sensitive to the effect of high humidity.     

过氧化心肌线粒体产生的脂类自由基及（－）－EGCG的抑制作用

本文利用ＥＳＲ技术研究了心肌线粒体酶修饰下的脂质过氧化和脂类自由基,以及（－）－ＥＧＣＧ的抑制作用。结果表明：４－ＰＯＢＮ能捕集ｌｉｐｏｘｙｇｅｎｇｓｅ诱发心肌线粒体产生的自由基,得到６条线谱的脂类自由基和４条线谱捕集物,（－）－ＥＧＣＧ对该体系中使用的１ｉｐｏｘｙｅｎａｓｅ活性无影响,对所产生的自由基有明显的清除作用,并呈量效关系。对脂质过氧化的抑制作用,在本试验浓度范围内随浓度增加变化不大,最大抑制率约２０％。     

丹参酮Ⅱ－A磺酸钠对鼠肝线粒体功能的影响

利用大鼠肝脏线粒体为材料,以琥珀酸为底物,研究了不同浓度的丹参酮Ⅱ－Ａ磺酸钠对线粒体态４、态３呼吸及呼吸控制率,线粒体跨膜电位,线粒体呼吸链复合体（Ⅱ＋Ⅲ）电子传递及质子转移活性的影响。结果证明丹参酮ⅡＡ－磺酸钠是线粒体呼吸链复合体（Ⅱ＋Ⅲ）的有效抑制剂。文中对丹参酮ⅡＡ－磺酸钠在心肌缺血再灌注过程中的保护作用的分子机理进行了讨论。     

Haptoglobin in Carnivora: a unique molecular structure in bear, cat and dog haptoglobins

Haptoglobin (Hp), a hemoglobin-binding protein in plasma, consists of α and β subunits and has a tetra-chain arrangement (β-α-α-β) connected by disulfide bridges in most mammals so far examined. Dog Hp has been reported to be unique compared with other Hps in respect that (1) the two αβ units are joined by a non-covalent interaction rather than a disulfide bridge and (2) the α chain has an oligosaccharide-binding sequence (Asn-X-Ser/Thr) and is glycosylated. To determine whether the unique structures of dog Hp are common in the Carnivora, we purified Hps from sera of bear and cat, and analyzed their subunit structure and partial amino acid sequences. The analyses by gel filtration and sodium dodecyl sulfate-polyacrylamide gel electrophoresis, under both reducing and non-reducing conditions, revealed that bear and cat Hps have similar subunit arrangements to dog Hp, suggesting the absence of a disulfide bridge between two α chains. This was confirmed by amino acid sequence analysis of the α chains: that is, Cys₁₅ participating in the inter-α chain disulfide bridge was replaced by Val in bear or Leu in cat and dog. Thus, the unique subunit arrangement of Hp reported in dog may be common in the Carnivora. In contrast to dog Hp, however, α chains of bear and cat Hps were found not to have the typical oligosaccharide binding sequence on their α chains and were not glycosylated.     

A novel type of meso-diaminopimelic acid-based peptidoglycan and novel poly (erythritol phosphate) teichoic acids in cell walls of two coryneform isolates from the surface flora of French cooked cheeses

The primary structure of the peptidoglycan and the teichoic acids of two coryneform isolates from the surface flora of French cooked cheeses, CNRZ 925 and CNRZ 926, have been determined. In the peptidoglycan, meso-diaminopimelic acid was localized in position three of the peptide subunit. It contained an d-glutamyl-d-aspartyl interpeptide bridge, connecting meso-diaminopimelic acid and d-alanine residues of adjacent peptide subunits. The -carboxyl group of d-glutamic acid in position two of peptide subunits was substituted with glycine amide. The teichoic acid pattern and composition differed between the strains: both contained an erythritol teichoic acid and strain CNRZ 925 also contained an N-acetylglucosaminylphosphate polymer. The erythritol teichoic acids differed in terms of the quality and quantity of substituents, but they both had N,N-diacetyl-2,3-diamino-2,3-dideoxyglucuronic acid in common.Abbreviations DNP dinitrophenyl - Ery erythritol - Gal galactose - GlcN glucosamine - GlcNAc N-acetylglucosamine - GlcUANAc₂ N,N-diacetyl-2,3-diamino-2,3-dideoxyglucuronic acid - Hex UANAc₂ N,N-diacetyl-2,3-diamino-2,3-dideoxyhexuronic - acid m-Dpm, meso-diaminopimelic acid - Mur muramic acid - MurNAc N-acetylmuramic acid     

丙泊酚联合七氟醚麻醉在先天性心脏病介入手术患儿中的心肌保护作用及对苏醒质量和应激反应的影响

摘要 目的：研究丙泊酚联合七氟醚麻醉在先天性心脏病介入手术患儿中的心肌保护作用及对苏醒质量和应激反应的影响。方法：选择2020年1月~2022年4月期间在苏州大学附属儿童医院接受先天性心脏病介入手术患儿96例,按照双色球法将患儿分为对照组（n=48,接受瑞芬太尼、丙泊酚麻醉）和观察组（n=48,接受丙泊酚、七氟醚麻醉）。对比两组患儿心率、呼吸频率、平均动脉压、苏醒质量、心肌损伤指标、应激反应指标和不良反应发生率。结果：两组置喉罩时（T1）~拔除喉罩（T4）时间点心率、呼吸频率、平均动脉压下降后升高,观察组高于对照组同时间点（P<0.05）。观察组的苏醒时间、拔管时间均短于对照组（P<0.05）。两组术毕、术后24 h肌酸磷酸激酶同工酶（CK-MB）、心肌肌钙蛋白（cTnI）升高后下降,观察组低于对照组同时间点（P<0.05）。两组术毕、术后24 h血糖、皮质醇升高后下降,观察组低于对照组同时间点（P<0.05）。两组不良反应发生率组间对比,差异不显著（P>0.05）。结论：丙泊酚联合七氟醚麻醉应用于先天性心脏病介入手术中,可减轻患儿的应激反应,稳定机体血流动力学波动,同时还可发挥心肌保护作用,提高苏醒质量。     

关节镜下双排缝合桥固定与单排固定治疗肩袖全层撕裂的疗效对比及术后早期再撕裂的危险因素分析

摘要 目的：对比关节镜下双排缝合桥固定和单排固定治疗肩袖全层撕裂的疗效,并分析术后早期再撕裂的危险因素。方法：回顾性分析广州中医药大学附属北碚中医院2018年1月~2021年12月期间收治的200例肩袖全层撕裂患者的临床资料,根据手术方案的不同分为A组（n=97,接受单排固定治疗）和B组（n=103,接受双排缝合桥固定治疗）。对比两组的疼痛、肩关节功能情况、肩关节活动度及术后早期再撕裂发生率。采用单因素和多因素Logistic回归分析肩袖全层撕裂患者术后早期再撕裂的危险因素。结果：术后6个月,B组视觉疼痛模拟评分量表（VAS）评分低于A组,美国加州大学肩关节评分系统（UCLA）评分、美国肩肘外科医师学会（ASES）评分高于A组（P<0.05）。术后6个月,B组前屈、外展、体侧外旋角度大于A组（P<0.05）。B组的术后早期再撕裂总发生率低于A组（P<0.05）。术后早期再撕裂的发生与糖尿病史、撕裂大小、吸烟史、年龄、术前肌肉质量、性别、脂肪浸润、注射皮质类固醇有关（P<0.05）。多因素Logistic回归分析结果显示：年龄≥60岁、性别为男性、吸烟史、糖尿病史、撕裂大小为巨大型再撕裂、脂肪浸润、注射皮质类固醇是术后早期再撕裂发生的危险因素（P<0.05）。结论：关节镜下双排缝合桥固定治疗肩袖全层撕裂,可更好的减轻疼痛症状,改善关节功能和关节活动度。此外,糖尿病史、脂肪浸润、吸烟史、高龄、撕裂大小为巨大型再撕裂、男性、注射皮质类固醇等是肩袖全层撕裂患者术后早期再撕裂的危险因素。     

GPX－abzyme对受XO／HX系统损伤的心肌线粒体的保护作用

探讨了研制的具有谷胱甘肽过氧化物酶活力的含硒抗体酶（ＧＰＸ－ａｂｚｙｍｅ）对于受损心肌线粒体的保护作用,利用牛的心肌线粒体为实验材料,通过线粒体的膨胀度、脂质过氧化物含量、ＣＣＯ活力变化及电镜观察等几个方面证明ＧＰＸ－ａｂｚｙｍｅ能抵抗ＸＯ／ＨＸ系统产生的自由基的损伤作用,ＥＳＲ研究也表明ＧＰＸ－ａｂｚｙｍｅ能明显降低ＸＯ／ＨＸ损伤系统中的自由基含量。