Dexmedetomidine group
Of the patients in the dexmedetomidine group, six were in the high LF/HF ratio group and 24 were in the low LF/HF group. Vasoactive drugs were required in two patients (33.3%) in the high LF/HF ratio group and in six patients (25.0%) in the low LF/HF ratio group. However, this difference was not statistically significant. The hemodynamic data showed no differences between the two groups (Table 