 A pilot study was performed with the technique used for the Group P. Power analysis showed that a minimum sample size of 40 patients 20 in each group was required to detect a 20 change in arterial pressures at a power level of 90 with p0.05. Categorical variables and hemodynamic parameters were analyzed using Mann-Whitney U Test and repeated-measures Anova respectively. Comparison of the incidence of the outcomes between the two groups was analyzed by a two-tailed Fishers exact test. Statistical significance was defined as p0.05. 