Ventricular premature complexes (VPCs) are known to be one of the most benign cardiac arrhythmias when they occur in structurally normal hearts. We experienced a 32-year old man who presented with dyspnea, palpitations and very frequent VPCs (31% of the total heart beats). Echocardiography revealed a dilated left ventricle (LV 66 mm at end-diastole and 57 mm at end-systole) and a decreased ejection fraction (34%). Very frequent VPCs had been detected 10 years previously and he underwent a failed radiofrequency catheter ablation (RFCA) procedure at that time. The patient had been treated with heart failure medications including betablockers, ACE inhibitors and spironolactone for the two most recent years. Six months after we eliminated these VPCs with a second RFCA procedure, the heart returned to normal function and size. Long standing and very frequent VPCs could be the cause of left ventricular dysfunction in a subset of patients who suffer with dilated cardiomyopathy, and RFCA should be the choice of therapy for these patients.
The research grasps water quality contamination source by investigating the data that are superordinate laws and the related plans implemented for establishing water quality improvement measures of upper stream for Chung-Ju Dam, present conditions of the hydraulic and hydrology, the present conditions and plans of environment basic facilities, and present conditions of main contamination source's occurrence load and discharge load, etc. The research used the QUAL2E simulation which is being widely applied to simulation of river water quality because the QUAL2E has high credibility among water quality simulations known throughout the country. On basis of this research, regulations and politic alternatives are required in order to water quality improvement upper stream for the Chung-ju dam, especially establishing processing facilities in the region where loading amount is concentrated should be considered with the additional research regarding cost-efficient facility of pollution source.
Center (PETC) enjoys an international reputation as a result of past accomplishments and ongoing cooperative agreements with other countries. This high regard for the institution and its people prompts professionals from around the world to come to PETC for training, technical expertise, and to collaborate on research projects. PETC's Overseas Activities 11 Since the early 1970s, PETC has been active in the international exchange of information with regard to coal technologies. In addition, PETC staff members traveling abroad find themselves as unofficial ambassadors of U.S. fossil energy technology. The 7th International Conference on Coal Science 17 This conference, better known as the ICCS, has continued on a biennial basis since 1979. It is recognized as the most prestigious of all conferences dedicated solely to the timely exchange of basic scientific information on coal. What Is Coal? 22 The most common description of coal, that of a black rock composed of amorphous carbon, formed by transformations of organic material that occur over tens to hundreds of millions of years, is misleading and fails to present a true picture of the nature and complexity of coal. NO, Reduction by SCWSNCR 30 Renewed focus has been placed on nitrogen oxides (NO,) reduction because NO, is likely to be targeted for further reduction by the U.S. Environmental Protection Agency.
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