Overview Dexmedetomidine and Magnesium Sulfate in Preventing Junctional Ectopic Tachycardia After Pediatric Cardiac Surgery Status: Recruiting Trial end date: 2023-04-01 Target enrollment: Participant gender: Summary to study the prophylactic effect of magnesium sulfate , dexmedetomidine or their combination in reduction the incidence of JETS postoperative Phase: Phase 4 Details Lead Sponsor: Kasr El Aini HospitalTreatments: DexmedetomidineMagnesium Sulfate