This research will confirm that Pcv-aCO2 is suitable for the guidance of early fluid therapy and the evaluation of the prognosis of patients with abnormal hemodynamics after abdominal tumor surgery, and is expected to be a new monitoring index to improve the therapeutic effect of these patients.
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The change of Pcv-aCO2
Timeframe: fluid resuscitation for 6 hours, 12 hours and 24 hours