The effects of bhpectral index-BlS monitorisution on the anesthetic agents consumption, recovery criteria and hospital stay

Abstract

Aim: This study was planned for observing the effects of monitoring of the depth of-anesthesia with BIS-bispectral index, a technique of cerebral monitoring, on the anesthetic agents consumption, recovery criteria and hospital stay. Materials and methods: ASA I-II (American Society of Anesthesiologists) 80 patients aged 20-60 years undergoing thyroidectomy, were included in the study. The first group which is monitorized by using Bispectral index is named as Group BIS while the other group which is monitorized by using hemodynamic parameters is named as Group HEMO. All patients have been administered the same anesthetic technique. The concentration of level of desflurane has been adjusted according to hemodynamic parameters in Group HEMO and BIS value 40-60 in Group BIS. The time between the volatile agent cut-off and extubation is named "extubation period" when the time passed until the awakening is named "awakening period". Besides, the periods between the volatile agent cut-off and leaving the operation room and desflurane consumptions have been recorded. When patients have score 9 of Mollified Aldretc Scoring they have been considered to be able to leave the recovery unit. The duration of staying time of each patient at the hospital was recorded. Results: Desflurane consumption in Group BIS was less than Group HEMO (p<0,05). MAC value of desflurane was higher at Group HEMO than Group BIS (p<0.05). The periods of extubation, awakening and leaving from operation room have been found shorter for Group BIS than Group HEMO (p<0,05). Heart rate, mean arterial pressures and hospital stay were similar between groups (p>0,05). Conclusion: Using bispectral index during anesthesia as an observation of the depth of anesthesia, which is giving objective knowledge, is affecting positively on the recovery criteria and reducing consumption of anesthetic agent.