1. [1] Reid LC, Brace DE. Irritation of the respiratory tract and its reflex effect upon the heart. Surg Gynecol Obstet 1940;70:157-62.
2. Reflex circulatory responses to direct laryngoscopy and tracheal intubation performed during general anesthesia;King;Anesthesiology,1951
3. Haemodynamic consequences of induction and endotracheal intubation;Prys-Roberts;Br J Anaesth,1971
4. [4] Batra YK, Indu B, Puri GD. Attenuation of pulse rate and blood pressure response to laryngoscopy and tracheal intubation by clonidine. International Journal of Clinical Pharmacology, Therapeutics and Toxicology 1988;26(7):360-3.
5. [5] Nishikawa T, Taguchi M, Kimura T, et al. Effects of clonidine premedication upon haemodynamic changes associated with laryngoscopy and intubation. Masui (Japan) 1991;40(7):1083-8.