References 1 Prys-Roberts C, Greene LT, Meloche R, Foex P. Studies of anaesthesia in relation to hypertension. II. Haemodynamic consequences of induction and endotracheal intubation. Br J Anaesth 1971; 43:531-545. 2 Shribman AJ, Smith G, Achola KJ. Cardiovascular and catecholamine response to laryngoscopy with and without endotracheal intubation. Br J Anaesth 1987; 59:295-299. 3 Derbyshire DR, Chmielewski A, Fell D, et al. Plasma catecholamine responses to tracheal intubation. Br J Anaesth

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... 55:855-860. 4 Thomson IR. The haemodynamic response to intubation: a perspective. Can J Anaesth 1989; 36:367-369. 5 Landesberg G, Mosseri M, Wolf Y, et al. Perioperative myocardial ischemia and infarction. Anesthesiology 2002; 96:264-270. 6 Knight AA, Hollenberg M, London MJ, et al. Perioperative myocardial ischemia: importance of the preoperative ischemic pattern. Anesthesiology 1988; 68:681-688. 7 Zimmermann P, Greim C, Trautner H, et al. Echocardiographic monitoring during induction of general anesthesia with a miniaturized esophageal probe. Power spectral density (PSD) channel 1 − logarithmic frequency scale Spectrogram of reflectance oximetric raw reflectance intensity signal. Example of power spectral density (PSD) computed from a raw reflectance intensity signal by a modified Welch periodogram method on a linear (top panel) and logarithmic (bottom panel) frequency scales. Note the clearly identifiable spectral peaks in the respective frequency ranges delimited by dashed vertical lines.