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Early Results of Mitral Valve Replacement in Severe Pulmonary Artery Hypertension—An Institutional Prospective Study 被引量:1
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作者 nirmal kumar Prashant Sevta +3 位作者 Subodh Satyarthy Saket Agarwal Vithal kumar Betigeri Deepak kumar Satsangi 《World Journal of Cardiovascular Surgery》 2013年第2期63-69,共7页
Introduction: In patients undergoing surgery for mitral valve replacement (MVR) for valvular heart disease, pulmonary artery hypertension (PAH) has been considered a major risk factor. In this prospective study, we ha... Introduction: In patients undergoing surgery for mitral valve replacement (MVR) for valvular heart disease, pulmonary artery hypertension (PAH) has been considered a major risk factor. In this prospective study, we have studied the early hemodynamic changes and post-operative outcomes of MVR among patients with severe PAH. Methods: 68 consecutive patients who underwent mitral valve replacement for severe rheumatic mitral valve disease with severe PAH (pulmonary artery pressure (PAP) > 50 mmHg) were studied prospectively for immediate postoperative hemodynamics and outcomes. The mean age of the patients was 32.1 years. 32 (47.05%) patients had mitral stenosis, 13 (19.11%) had mitral regurgitation and 23 (33.82%) had mixed lesions. Patients were divided into two groups based on preoperative pulmonary artery pressures. In 56 patients (82.35%, group I) PAP was sub-systemic or systemic, with a mean of 58.4 mmHg. Twelve patients (17.65%, group II) had supra-systemic PAP with a mean of 82.4 mmHg. Results: After mitral valve replacement, the PAP and pulmonary vascular resistance (PVR) decreased significantly in group I to near normal levels. In group II also the PAP and PVR decreased significantly but significant residual PAH remained. Operative mortality was 3.5% in group I and 16.6% in group II. Conclusions: MVR is safe and effective at the presence of severe PAH as long as the PAP is below or equal to systemic pressures. With suprasystemic PAP, MVR carries a high risk of mortality and the patient continues to have severe PAH in the postoperative period. 展开更多
关键词 PULMONARY ARTERY Hypertension MITRAL Valve REPLACEMENT
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Parallelization of H.264 Encoder Using FPGA Based Symmetric Multi-Core Processors
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作者 Murali Krishnan Elumalai Gangadharan Esakki nirmal kumar 《通讯和计算机(中英文版)》 2011年第6期476-482,共7页
关键词 多核心处理器 H.264 FPGA 并行执行 编码器 视频压缩算法 DSP处理器 对称
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