Effect of levosimendan on hemodynamic changes in patients undergoing off-pump coronary artery bypass grafting: A randomized controlled study oleh Rajesh Kumar Kodalli, Ayya Syama Sundar, Mahesh Vakamudi, Harish Ravulapali, Sushma Nandipati, Nivash Chandrasekaran, Ranjith Baskar Karthekeyan