Figure 1. Changes in hemodynamic variables. Data are shown as mean. DA: dexmedetomidine- alfentanil, KA: ketamine-alfentanil. T0: baseline, T1, T5, and T15: 1, 5, and 15 min after drug infusion in both groups, Trecov: at the recovery ward, T2h, and T6h: 2 and 6 hours after infusion.