By observing the changes of Central venous-arterial partial pressure difference of carbon dioxide \[P (v-a) CO2\] in liquid resuscitation during early escharectomy in patients with large-scale burns, We investigate the effect of P (v-a) CO2 on postoperative tissue perfusion and oxygenation in order to seek a more effective intergrated target plan of liquid resuscitation for burn patients.
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Central venous oxygen saturation
Timeframe: From start anesthesia until end of anesthesia, up to a maximum of 6 hours
Lactic acid value
Timeframe: From start anesthesia until end of anesthesia, up to a maximum of 6 hours