Rapid Intravenous Infusion of Mannitol Results in a Dipper-type Change in Stroke Volume Variation in Patients Undergoing Major Neurosurgery

The purpose of this study is to observe the variation of Hemodynamics、lactic acid、base excess、peripheral vascular resistance and DO2 through FloTrac™/Vigileo™ system after rapid infusion mannitol in neurosurgery.The hemodynamic changes after mannitol infusion are shown in Figure 1. HR (Fig. 1A) and systolic BP (Figure 1B) significantly increased between 0 min and 10 min (P = 0.041) and between -10 min and 10 min (P = 0.073), respectively; these two variables decreased steadily and returned to the baseline. Diastolic BP (Fig. 1B) showed no significant change after mannitol infusion (P = 0.102). CVP (Fig. 1C) significantly increased between -20 min and 0 min (P \< 0.001) and constantly decreased after 0 min, which remained below the baseline between 30 min and 60 min. CI (Fig. 1D) and SVI (Fig. 1E) showed a significant persistent increase between -20 min to 0 min (P \< 0.001) and between -20 min and 10 min (P \< 0.001), respectively. SVV exhibited a dipper-type change shown as a significant decrease between -20 min and 0 min and a significant increase between 0 min and 60 min (P \< 0.001), which returned to the baseline after 20 min.