Objective To explore the changes of hemodynamics and oxygen delivery(DO 2) by transesophageal echo Doppler during acute hypervolemic hemodilution(HHD) with 6% hydroxyethel starch(HES).

• 目的 应用经食管超声多普勒血液动力学监测仪 ,观察全麻下急性高容量血液稀释(HHD)的血液动力学和氧供 (DO2 )变化。