Overview The Efficacy and the Safety of Dexmedetomidine Sedation on the Pediatric Intensive Unit(PICU) Patients. Status: Unknown status Trial end date: 2015-12-01 Target enrollment: Participant gender: Summary To observe the efficacy and safety of dexmedetomidine sedation on the patients admitted to the pediatric intensive care unit after surgery. Phase: Phase 4 Details Lead Sponsor: Anhui Provincial Children's HospitalTreatments: DexmedetomidineFentanylMidazolam