The patients in group C (control) (n=30) were bolused with 1 mg kg-1 ketamine (Ketalar®, Eczacibasi, Luleburgaz, Turkey) (IV) and 1 mg kg-1 propofol (Propofol 1% Fresenius, Fresenius Kabi Deutschland, Bad Homburg, Germany) (IV) followed by 1 mg kg-1 hour-1 ketamine (IV) and 50 µg kg-1 min-1 propofol (IV) infusion. Additionally a loading dose of 1 ml kg-1 D5 0.3% NaCl IV given over 10 minutes, followed by 0.5 ml kg-1 hour-1 IV D5 0.3% NaCl infusion were administered.

The patients in group D (dexmedetomidine) (n=30) were bolused with 1mg kg-1 ketamine (IV), 1mg kg-1 propofol (IV) followed by 1 mg kg-1 hour-1 ketamine (IV) and 50 µg kg-1 min-1 propofol (IV) infusion. Additionally a loading dose of 1 µg kg-1 dexmedetomidine (Precedex Abbott Labs, North Chicago, IL) IV given over 10 minutes, followed by 0.5 µg kg-1 hour-1 IV dexmedetomidine infusion were administered. Dexmedetomidine was prepared as a 1 µg ml-1 solution using D5 0.3% NaCl solution.

a loading dose of 1 µg kg-1 dexmedetomidine (Precedex Abbott Labs, North Chicago, IL) IV given over 10 minutes, followed by 0.5 µg kg-1 hour-1 IV dexmedetomidine infusion were administered. Dexmedetomidine was prepared as a 1 µg ml-1 solution using D5 0.3% NaCl solution.

The patients were evaluated for complete blood count and blood levels of creatinine (Cr), Neutrophil Gelatinase-Associated Lipocalin (NGAL), renin, endothelin-1, total antioxidant status (TAS) and total oxidant status (TOS) before the procedure and 6 and 24 hours after the procedure.

After the patients were taken to the pediatric cardiac catheterization laboratory, mean arterial pressure (MAP), heart rate (HR), peripheral oxygen saturation (SpO2).