Ephedrine versus Ketamine in Preventing Hemodynamic Instability in Intubated and Mechanically Ventilated Patients; An Observational Study. - Gopala Krishna, Bhattaram Skanda; Siripriya, Pasupuleti; Krishna, Penagaluru Pranay; Sankar, Velavarthipati Ravi; Hareesh, Karuvalli Mohanan; Praveen, Kalle; Raghu, Kondle (Journal of Practical Emergency Medicine, 2025)