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Efficiency of the attention networks in the group not monitored using the bispectral index (BIS) (non-BIS group). Attention network (alerting, orienting, and executive control) functions in the non-bispectral index (BIS) group were assessed pre-operatively and at day 1 and day 5 postoperatively. * P<0.05 vs. corresponding pre-operative value; # P<0.05 vs. corresponding pre-operative value.
