Stuck up and fracture of coronary angioplasty hardware are unwonted complications of percutaneous coronary interventions (PCI) for which surgical retrieval and management is once in a while required. We present one ca...Stuck up and fracture of coronary angioplasty hardware are unwonted complications of percutaneous coronary interventions (PCI) for which surgical retrieval and management is once in a while required. We present one case of a 59-year-old diabetic, a hypertensive gentleman who attended the emergency room (ER) with central chest pain for 2 hours. After evaluation of the patient <span>by physical and noninvasive diagnostic tests, he was diagnosed as a case of</span> acute myocardial infarction (AMI) with stable hemodynamic. For the aforementioned findings, the patient was treated first with a thrombolytic agent in <span>ER and then shifted to Cardiology Department for monitoring and further</span> <span>coronary evaluation by coronary angiography (CAG). CAG revealed essen</span><span>tially single vessel disease (SVD) with complex left anterior descending (LAD) </span>artery lesion, so PCI was attempted but failed with an unfortunate incidence of the broken delivery shaft and left <i>in vivo</i>. Immediate decision making and <span>surgical management for retrieval of lost angioplasty device and correction</span> coronary lesion with revascularization save the patient from grave complica<span>tion. All the series of events and management approaches of this very com</span>plex coronary artery lesion are discussed in this article.展开更多
近年来,风能资源大力发展,风火打捆经直流送出成为中国目前及未来开发和利用的主要方式,风电机群和高压直流输电(high voltage direct current,HVDC)对同步发电机组(synchronous generator,SG)轴系扭振各模态电气阻尼的影响规律有待深...近年来,风能资源大力发展,风火打捆经直流送出成为中国目前及未来开发和利用的主要方式,风电机群和高压直流输电(high voltage direct current,HVDC)对同步发电机组(synchronous generator,SG)轴系扭振各模态电气阻尼的影响规律有待深入研究。针对直驱风电机群、火电机组和直流输电,建立了系统的线性化模型,分析了接入设备对火电机组电气阻尼的交互耦合关系和风火打捆经直流送出系统中火电机组轴系扭振的机理。基于复转矩系数法,研究了风电机群运行风速、控制参数和直流输电输送功率、控制参数等因素对同步发电机组电气阻尼系数的影响。最后,在PSCAD/EMTDC中搭建风火打捆经直流送出系统的时域仿真模型,通过时域仿真和时频分析,验证了电气阻尼系数分析结果的有效性。展开更多
文摘Stuck up and fracture of coronary angioplasty hardware are unwonted complications of percutaneous coronary interventions (PCI) for which surgical retrieval and management is once in a while required. We present one case of a 59-year-old diabetic, a hypertensive gentleman who attended the emergency room (ER) with central chest pain for 2 hours. After evaluation of the patient <span>by physical and noninvasive diagnostic tests, he was diagnosed as a case of</span> acute myocardial infarction (AMI) with stable hemodynamic. For the aforementioned findings, the patient was treated first with a thrombolytic agent in <span>ER and then shifted to Cardiology Department for monitoring and further</span> <span>coronary evaluation by coronary angiography (CAG). CAG revealed essen</span><span>tially single vessel disease (SVD) with complex left anterior descending (LAD) </span>artery lesion, so PCI was attempted but failed with an unfortunate incidence of the broken delivery shaft and left <i>in vivo</i>. Immediate decision making and <span>surgical management for retrieval of lost angioplasty device and correction</span> coronary lesion with revascularization save the patient from grave complica<span>tion. All the series of events and management approaches of this very com</span>plex coronary artery lesion are discussed in this article.
文摘近年来,风能资源大力发展,风火打捆经直流送出成为中国目前及未来开发和利用的主要方式,风电机群和高压直流输电(high voltage direct current,HVDC)对同步发电机组(synchronous generator,SG)轴系扭振各模态电气阻尼的影响规律有待深入研究。针对直驱风电机群、火电机组和直流输电,建立了系统的线性化模型,分析了接入设备对火电机组电气阻尼的交互耦合关系和风火打捆经直流送出系统中火电机组轴系扭振的机理。基于复转矩系数法,研究了风电机群运行风速、控制参数和直流输电输送功率、控制参数等因素对同步发电机组电气阻尼系数的影响。最后,在PSCAD/EMTDC中搭建风火打捆经直流送出系统的时域仿真模型,通过时域仿真和时频分析,验证了电气阻尼系数分析结果的有效性。
