Esketamine for Prevention of Depression After Cytoreductive Surgery in Ovarian Cancer

The goal of this clinical trial is to learn if intraoperative administration of esketamine would prevent or mitigate postoperative depressive symptoms after cytoreductive surgery in ovarian cancer. The main questions it aims to answer are: * Whether a single low dose of esketamine administered would reduce the postoperative depressive symptoms three days after cytoreductive surgery in ovarian cancer? * Whether a single low dose of esketamine administered would relief the postoperative sleep disturbance, postoperative recovery? Researchers will compare the esketamine to a placebo (normal saline) to see if the esketamine works to reduce the postoperative depressive symptoms. Participants will: * Receive either 0.2 mg/kg esketamine or placebo infused intravenously after induction of general anesthesia. * The preoperative Patient Health Questionnaire 9 (PHQ-9) scale was used to verify the symptoms suggestive of depression.