TO SIMULTANEOUSLY CORRELATE THE OBSERVED BIS SCORES WITH HEMODYNAMIC CHANGES

Abstract

Background & Method: The present study was carried out in the Department of Anaesthesiology, Index Medical College Hospital & Research Centre, Indore with an aim to simultaneously correlate the observed BIS scores with hemodynamic changes. The study was carried out in 50 patients of ASA grade I& II scheduled for surgeries like laparotomy, hemithyroidectomy, cholecystectomy etc. During the above said study period, 50 patients posted for elective general surgeries under general anaesthesia underwent continuous EEG analysis. Patients underwent routine pre- anaesthetic evaluation and routine NPO protocols were followed.

Result: BIS scores showed changes at various stages in anaesthesia. On induction, BIS decreased to 46 and increased to 52 by 3rd min of intubation. On incision, the score increased to 63. At closure, it increased to 79. Post extubation, a score of 94 was achieved in 15 min.

Conclusion: The correlation between BIS and hemodynamics could not be statistically established. In view of significant disparities in BIS scores and hemodynamics in individual patients, anaesthesia management was suitably modified. We found that BIS values decrease with induction to 45 within 3 min by using propofol, and the BIS values increases to 51, 55, 59 in 30 sec, 1min and 3 min of intubation and reaches 62, 63 at 1 and 5 min after incision. In the maintenance phase the scores in our study were between 45 to 70 until 15 min before extubation, when the scores were maintained between 72-77, to facilitate recovery. Immediate post extubation BIS scores were 87 and it increased gradually to 93 within 15min.

Keywords: BIS scores & hemodynamic.