Anesthesia management
All patients were administered general anesthesia according to our clinic's standard CD protocol. No premedication was administered to the patients. In addition, all the patients were started on intravenous infusion of Ringer’s lactate solution (5–7mL/kg/h). After ASA-recommended standard monitoring (non-invasive blood pressure monitoring, electrocardiography, and peripheral oxygen saturation), anesthesia was induced with propofol (2.5mg/kg) and rocuronium (0.6mg/kg), followed by tracheal intubation. After the umbilical cord was clamped, remifentanil was administered at 0.25mcg/kg/min as an analgesic. Sevoflurane and O