Supraacetabular insufficiency fractures

Insufficiency fractures in the supraacetabular region were identified in five women, aged 55-83 years. Factors contributing to the diminished resistance of their bones included postmenopausal osteoporosis, steroid therapy, radiation therapy, and rheumatoid arthritis. The supraacetabular fractures were seen on routine radiographs as hazy bands of sclerosis located immediately above and parallel to the acetabular roof. All five patients had additional fractures in the spine or pelvis. Supraacetabular insufficiency fractures may be an unsuspected cause of hip pain, especially in older women.     

Ferromagnetic materials in patients: detection before MR imaging

A number of surgical clips and other metallic materials embedded within patients have ferromagnetic properties that present a potential hazard when in the strong fields associated with magnetic resonance imaging. Several types of magnetometers and metal detectors were investigated as possible pre-imaging screening devices. The sensitivities and costs of these devices are given.     

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Current aspects of forensic lawFrom October 2004 to March 2005

     

高压培养对血管内皮细胞t-PA和PAI-1的影响及卡托普利干预的效果

目的：高血压常伴有纤溶功能的异常,但其机制尚不清楚。本研究拟观察高静水压培养对人脐静脉内皮细胞（HUVECs）t-PA和PAI-1的影响以及卡托普利的干预效果,并探讨其可能的作用机制。方法：选用第4～6代HU-VECs,接种于24孔培养板中。依培养压力分为3组：大气压组（0mmHg）,中压组（90mmHg）,高压组（180mmHg）。在同一压力组,根据不同药物干预又分为两个亚组。即对照组（Ctrl）和卡托普利组（Cap,10^-5mol/L）。每组6份标本。采用ELISA法测定上清液t-PA和PAI-1的抗原浓度,并用细胞内总蛋白进行标化（单位：ng/μg proteins）。同时测定细胞内Ca^2＋浓度（nmol/L）。结果：与大气压组相比,中压和高压组t-PA浓度均显著降低,PAI-1浓度显著增高,t-PA/PAI-1比值显著降低,[Ca^2＋]i也显著增高。卡托普利对大气压组的t-PA、PAI-1和[Ca^2＋]i无显著影响,但在两个高压组,卡托普利显著升高t-PA浓度,显著降低PAI-1浓度,t-PA/PAI-1比值显著升高,[Ca^2＋]i显著地降低。结论：高静水压可损害内皮细胞的纤溶功能,而卡托普利的干预可降低高压所升高的[Ca^2＋]i,并改善高静水压对内皮细胞纤溶功能的影响。