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medicine education presentation cardiac anaesthesia coronary transesophageal echo raas frank starling law stroke volume cardiac reflexes contractility afterload preload cardiac output physiology of heart heart anatomy critical care icu seminar anesthesia newer modes ventilator icu critical care anesthesia md anesthesia ppt medical health healthcare pathophysiology of ms proximal isovelocity surface a pisa wilikins score deceleration time planimetry pressure half time tee mitral stenosis papillary muscles chordae scallops leaflets commisurres transgastric views mid esophageal views subvalvular apparatus mitral valve anatomy katz grading epiaortic echocardiography counselling sts score euroscore risk stratification cardiac surgery preoperative coronary steal coronary perfusion pressure