Gupta, C.; Rastogi, B.; Agarwal, S.; Singh, V. P.; Choudhary, V. K.; Inayat, U. Clinical Efficacy of Esmolol, Lignocaine and Diltiazem As Premedicant for Attenuation of Hemodynamic Responses of Laryngoscopy and Endotracheal Intubation- a Comparative Evaluation. Int J Res Med Sci 2017, 5, 4443-4449.