Effect of Hydration Guided by Vigileo on the Prevention of CIN After PCI for Patients With AMI

If the patient is mechanically ventilated, the following scheme is adopted: if SVV≤10%, then adjust the rehydration speed to 1 ml/kg/h; if 10%\<SVV\<15%, then adjust the rehydration speed to 2 ml/kg/h; if SVV≥15%, then adjust the rehydration speed to 3 ml/kg/h. The hydration lasts 24 hours after operation, and the rehydration speed is changed according to the SVV. If the patient does not use mechanical ventilation, the following scheme is adopted: 250ml normal saline is administered within 10 minutes after direct PCI, and the rehydration volume changes to 125ml in patients with mild-to-moderate congestive heart failure. If the increment of SV≥15%, then adjust the rehydration speed to 3 ml/kg/h; if 10%≤the increment of SV\<15%, then adjust the rehydration speed to 2 ml/kg/h; if the increment of SV\<10%, then adjust the rehydration speed to 1 ml/kg/h. Reassessed every 1 hour until SV is stable，and the hydration also lasts 24 hours after operation.