Gökahmetoglu, Günhan Kayseri Eğitim Araştırma Hastanesi - Anestezi Bölümü, Turkey , Tercan, Elvan Medipol university - Medical Faculty - Department of Anaestesiology and Reanimation, Turkey , Bicer, Cihangir Medipol university - Medical Faculty - Department of Anaestesiology and Reanimation, Turkey , Aksu, Recep Erciyes University - Medical Faculty - Departments of Anesthesiology, Turkey , Boyaci, Adem Erciyes University - Medical Faculty - Departments of Anesthesiology, Turkey

Comparison of the depth of anesthesia in sevoflurane and halothane anesthesia with bispectral index and 95% spectral edge frequency

26877

Objective: The aim of the present study was to evaluate the depth of anesthesia provided by halothane or sevoflurane by using the bispectral index (BIS) and 95% spectral edge frequency (SEF) monitoring systems. Methods: Forty patients, between the ages of 20-60 years, scheduled for gynecological surgery under general anesthesia were studied between the years 2001-2002. Anesthesia induction was maintained by conventional spontaneous inhalation induction method with sevoflurane in the group I patients (n=20), with halothane in the group II patients (n=20). SEF and BIS index values were recorded. Results: In both groups, SEF values recorded before intubation, after intubation, before and after skin incision were significantly lower compared with values recorded at baseline (p 0.05). Also, SEF values in both groups recorded after anesthesia induction were significantly higher compared with baseline values (p 0.05). Regarding the recorded SEF values after extubation, there were statistically significant differences between the two groups (p 0.05). In both groups, BIS values recorded after anesthesia induction, before intubation, after intubation, before and after skin incision were significantly lower compared with values recorded at baseline and after extubation (p 0.05). Regarding the recorded BIS values before intubation and 1 min after intubation, there were statistically significant differences between the two groups (p 0.05). Conclusion: We conclude that BIS index and SEF values will only be helpful in the evaluation of the hypnosis component of anesthesia and it is not sufficient in showing the autonomous response, which is formed against the perioperative sympathetic and surgical stimulations.

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Bispectral index , halothane , sevoflurane , anesthesia depth , hemodynamic responses

Dicle Medical Journal

356