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iEnergy 2022年第1期1卷 100-113页

作者： Slavko Mocevic Jianghui Yu Boran Fan Keyao Sun Yue Xu Joshua Stewart Yu Rong He Song Vladimir Mitrovic Ning Yan Jun Wang Igor Cvetkovic Rolando Burgos Dushan Boroyevich Christina DiMarino Dong Dong jayesh kumar motwani Richard Zhang Center for Power Electronics Systems(CPES) Bradley Departement of Electrical and Computer EngineeringVirginia TechBlacksburgVA 24061USA Center for Electromechanics(CEM) The University of Texas at AustinAustinTX 78758USA Department of Electrical and Computer Engineering at the University of Nebraska-Lincoln LincolnNE 68588USA

Simultaneously imposed challenges of highvoltage insulation,high dv/dt,highswitching frequency,fast protection,and thermal management associated with the adoption of 10 kV SiC MOSFET,often pose nearly insurmountable barriers to potential users,undoubtedly hindering their penetration in mediumvoltage(MV)power *** novel technologies such as enhanced gatedriver,auxiliary power supply network,PCB planar dcbus,and highdensity inductor are presented,enabling the SiCbased designs in modular MV converters,overcoming aforementioned ***,purely substituting SiC design instead of Sibased ones in modular MV converters,would expectedly yield only limited ***,to further elevate SiCbased designs,novel highbandwidth control strategies such as switchingcycle control(SCC)and integrated capacitorblocked transistor(ICBT),as well as highperformance/highbandwidth communication network are *** these technologies combined,overcome barriers posed by stateoftheart Si designs and unlock system level benefits such as very high power density,highefficiency,fast dynamic response,unrestricted line frequency operation,and improved power quality,all demonstrated throughout this paper.

关键词： SiC MOSFET modular multilevel converter(MMC) switching-cycle control(SCC) integrated capacitor-blocked transistor(ICBT) PEBB medium-voltage(MV) high density high efficiency

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Severe Mitral Regurgitation Due to Pacing in Patient Post Aortic Valve Replacement (A Case Report)

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World Journal of Cardiovascular Surgery 2018年第1期8卷 22-27页

作者： Shailendra kumar motwani Vishnu Datt D. K. Tempe National Board G.B. Pant Hospital New Delhi India Department of Cardiac Anesthesiology and Critical Care G.B. Pant Hospital New Delhi India Department of Cardiac Anesthesiology G.B. Pant Hospital New Delhi India

Epicardial Cardiac pacing may lead to severe Mitral Regurgitation by one of the following mechanisms: 1) Inappropriate Atrioventricular interval. 2) Myocardial ischemia due to fast heart rate may cause transient papillary muscle dysfunction. 3) Right Ventricular apical pacing may lead to Left Ventricular dyssynchrony in the presence of optimal Atrioventricular synchrony. Acute severe Mitral Regurgitation leading to acute severe hemodynamic deterioration is a reported complication of Permanent Pacemaker insertion. Our case demonstrated acute severe MR as a consequence of RV Pacing leading to acute hemodynamic deterioration, which was relieved on withdrawal of pacing. Left Ventricular dyssynchrony can be relieved by reducing the peacemaker rate or changing to biventricular pacing, this reduces the severity of Mitral Regurgitation and improves the hemodynamics due to simultaneous activation of left and right ventricles. This case illustrates the acute and potentially dramatic effects of intra-Left Ventricular dyssynchrony upon Mitral Valve function. Informed consent was obtained from the patient to report the case. Thus right ventricular pacing can cause left ventricular dyssynchrony leading to worsening of Mitral Regurgitation. It is important to pay attention to mode of pacing when evaluating Mitral Regurgitation in patients with Right Ventricular pacemaker and unstable hemodynamics after initiation of pacing.

关键词： Epicardial Pacing Mitral Regurgitation Dyssynchrony Hemodynamics Cardiopulmonary Bypass Atrioventricular Synchrony Atrioventricular Interval

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