颅内动脉瘤辅助栓塞治疗的回顾性研究

目的 探讨颅内动脉瘤的两种辅助栓塞技术与围手术期预后之间的关系.方法 回顾2006年5月至2010年12月栓塞治疗颅内动脉瘤患者围手术期预后情况,将结果转换为GOS评分,并分组统计；统计学分析两种栓塞技术与围手术期预后之间的相关性.结果 共辅助栓塞治疗动脉瘤患者148例,球囊辅助弹簧圈栓塞技术治疗55例,围手术期预后良好率74.5％,重残率20.0％,死亡率5.5％；支架辅助弹簧圈栓塞技术治疗93例,围手术期预后良好率84.9％,重残率9.7％,死亡率5.4％；两组之间存在统计学差异(P＜0.001).结论 围手术期预后支架辅助栓塞优于球囊辅助栓塞.     

Acute Claudication caused by Angio-Seal Closure Devices: a Report of Four Cases

Femoral artery closure devices are increasingly used after percutaneous arterial interventions to obtain hemo-stasis at the puncture site. Their efficacy and advantages in patient comfort are established. Nevertheless they can cause their own specific complications. In a five month’s period we had to treat four patients with sudden onset invalidating claudication after the use of an Angio-Seal closure device. Malpositioning of the device led to the ischemic complications. We describe and illustrate the pre-and peroperative findings and the treatment. Interventionalists should monitor and register ischemic complications following the use of puncture site closure devices in order to try and minimize these. The occurrence of few serious complications can outweigh the relative small benefits these devices offer.     

Minimally invasive repair of the mitral valve: Technological and clinical developments

Abstract

The present article will review new technology in the invasive approach to mitral valvular disease. Mitral valve pathology continues to present an important challenge to the cardiac surgeon and interventionalist. From the early days of closed mitral valvular commisurotomy, a number of new approaches to this valve have been developed. Mitral stenosis was previously approached through a minimally invasive beating heart surgical approach, but may now be treated with either catheter-based or open surgical techniques. Regurgitation, which has become the leading pathology of the mitral valve in the developed world, may be approached through traditional cardiac surgery or through catheter-based techniques. New imaging techniques and device innovation will cause drastic changes in therapy for mitral valvular disease in the foreseeable future.     

Endovascular laser detachment of platinum alloy microcoils: Principle and initial experimental experience

Abstract

The aim of the investigation was the technical realization and approval of a new method for insertion and detachment of platinum alloy microcoils and other vascular implants via standard microcatheters. Flexible lightconducting fibers, 105 μm in diameter were connected to platinum alloy microcoils. It was examined whether an insertion wire, a lightconducting fiber and a platinum alloy microcoil could be advanced through a Tracker-18 (Target) microcatheter. The detachment of the attached coil from the lightconducting fiber was investigated. Platinum alloy microcoils can be attached to available lightconducting fibers in a reliable and reproduceable manner. Together with the fiber they can be advanced via a Tracker-18 microcatheter. Only extremely tortuous vessels may increase the friction to critical values. A Ho-YAG laser source was used. This allowed the instantaneous detachment of microcoils from laser fibers. In contrast to electrolytical detachment; no foreign substances are released to the blood stream. The detachment does not require waiting time and does not activate thrombus formation. Due to specific technical features, injuries of the vessel wall are avoided. After further miniaturization and adaption of the lightconducting fibers to the required characteristics; I aster detachment may have the potential to replace current methods such as electrolytical and mechanical coil detachment. [Neurol Res 1996; 18: 256–258]     

Investigating the performance of four specific types of material grafts and their effects on hemodynamic patterns as well as on von Mises stresses in a grafted three-layer aortic model using fluid-structure interaction analysis

One of the important parts of the cardiac system is aorta which is the fundamental channel and supply of oxygenated blood in the body. Diseases of the aorta represent critical cardiovascular bleakness and mortality around the world. This study aims at investigation of hemodynamic parameters in a two-dimensional axisymmetric model of three-layer grafted aorta using fluid–structure interaction (FSI). It assumes that a damaged part of aorta, which may happen as a result of some diseases like aneurysm, dissection and post-stenotic dilatation, is replaced with a biomaterial graft. Four types of grafts materials so-called Polyurethane, Silicone rubber, Polytetrafluoroethylene (PTFE) and Dacron are considered in the present study. The assumption of linear elastic and isotropic material is set for the both aorta's wall and aforementioned grafts. Blood is considered as an incompressible and Newtonian fluid. The results indicate higher displacement in Polyurethane and silicone rubber in comparison with other two. Furthermore, results reveal that blood flow velocity has slightly higher values in PTFE and Dacron grafted models compared to Polyurethane and Silicone rubber ones. Even though there are some differences in hemodynamic patterns in these grafted models, they are not considerable as much as von Mises stresses across the graft-aorta intersections are. This study shows that the types of material grafts play an important role in the amount of stresses particularly at intersections of aorta and graft.