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Postoperative analgesia by continuous extradural infusion of ropivacaine after upper abdominal surgery

Continuous Extradural InfusionHealth SciencesPain MedicineUpper Abdominal SurgeryMedicinePostoperative Pain ManagementPerioperative PainPreoperative PainPain ManagementSurgeryPostoperative AnalgesiaAnesthesiaPerioperative MedicineAnesthetic AdministrationAnesthesiologyRegional Anesthesia