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Objective. In a model of rat cardiac hypertrophy, the changes in the distribution of ET-1 receptors in two subcellular fractions, the sarcolemma and the light vesicles during myocardial hypertrophy were studied. Methods. Cardiac hypertrophy was produced by placing a constricting clip around the suprarenal abdominal aorta of rats, and ET-1 receptor was assayed with radioactive analysis method. Results. It was found that plasma and ventricular ET-1 levels increased significantly on week 2 and week 4 of pressure overload. ET-1 binding studies showed that during myocardial hypertrophy, the maximum binding capacity (Bmax) was increased by 41% (P<0.01) and 65% (P< 0.01) in sarcolemma in H-2 week and H-4 week groups, but was decreased by 24% (P< 0.01) and 21% (P< 0.01) in light vesicles. The sum of Bmax of sarcolemmal and light vesicle fractions was increased by 33% (P< 0.01) and 57% (P< 0.01) in group H-2 week and H-4 week, respectively. ? Conclusion. ET-1 receptors in rat heart were externalized from light vesicles to sarcolemma, which may contribute to the development of myocardial hypertrophy.
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根本原因分析法在门诊化疗给药错误分析中的应用
用药是一个十分复杂的过程,通常需要经历10多个步骤,即诊断、选药、处方、转抄医嘱、审核处方、调配、核对、发药、保存、计算剂量、稀释配制、按时用药、观察效果、监测体内浓度、监测不良反应、调整用药方案等.每一步都有可能发生差错[1].给药错误指的是病人实际接受的药物与医嘱之间存在差异[2].我们采用根本原因分析法(root cause analysis,RCA)对1例门诊病人化疗给药错误作回顾性分析,探讨门诊化疗给药错误的根本原因及防范措施.
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有限元分析法在口腔生物力学领域的应用
在口腔医学中存在着大量的牛物力学问题,有限元法是对人体的力学行为进行数值模拟的一种有效工具,其在口腔生物力学中的应用越来越广泛.本文综述了有限元法在解决口腔生物力学问题中的研究进展,包括口腔正畸、口腔修复、口腔种植、口腔颌面外科等领域的力学性能评价.有限元法为研究口腔医学中的有关基础性问题、解决口腔医学中的临床实际问题、发展口腔临床技术手段提供了力学基础,为进一步研究口腔疾病治疗方法提供参考和借鉴.指出了有限元法在口腔生物力学中应用的不足以及三维模型重建和分析中需进一步改进和研究的问题.