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The bispectral index response to tracheal intubation is similar in normotensive and hypertensive patients

[La réponse de l'index bispectral à l'intubation endotrachéale est similaire chez les patients normotendus et hypertendus]

Masayasu Nakayama, MD^*, Hiromichi Ichinose, MD, Shuji Yamamoto, MD, Noriaki Kanaya, MD^* and Akiyoshi Namiki, MD PhD^*

^* From the Department of Anesthesiology, Sapporo Medical University School of Medicine, Sapporo; and
the Division of Anesthesia, Obihiro Kosei Hospital, Obihiro, Japan.

Address correspondence to: Dr. Masayasu Nakayama, Department of Anesthesiology, Sapporo Medical University School of Medicine, South 1, West 16, Chuoku, Sapporo 060-8543, Japan. Phone: +011 611-2111; Fax: +011 631-9683; E-mail: miyabi{at}zc4.so-net.ne.jp

Purpose: To compare the hemodynamic and bispectral index (BIS) responses to tracheal intubation in normotensive and hypertensive patients.

Method: Three minutes after induction of anesthesia with thiamylal and fentanyl, tracheal intubation was performed in 24 normotensive and 22 hypertensive patients. Heart rate (HR), mean arterial pressure (MAP), and BIS were measured every minute.

Results: Tracheal intubation increased HR, MAP, and BIS in both normotensive and hypertensive patients. The increase in MAP was significantly greater in hypertensive patients than in normotensive patients, but there were no differences in HR or BIS in the two groups of patients.

Conclusion: Patients with and without hypertension exhibit the same arousal response (as measured by BIS) to tracheal intubation despite the enhanced vasopressor response in hypertensive patients.

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