A comparison of hemodynamic effects of levosimendan and dobutamine in patients undergoing mitral valve repair / replacement for severe mitral stenosis oleh Ravikumar Gandham, Ayya Syamasundar, Harish Ravulapalli, Ranjith B Karthekeyan, Mahesh Vakamudi, Rajeshkumar Kodalli, Sushma Nandipati