question: Compared to hyperbaric bupivacaine what was the result of isobaric bupivacaine on reduce bispectral index (BIS)?
context: Difference of BIS from baseline was not significant between two groups at most time points except for the 45th minute after injection that it was 5.9 ± 9 vs. 2.7 ± 4.6 for hyperbaric and isobaric bupivacaine, respectively (p = 0.047).