MATERIALS AND METHODS
A retrospective cohort study performed including all patients who underwent cardiac catheterization in the first 5 weeks after congenital heart surgery. It included diagnostic and interventional procedures from November 2015 to May 2018 in PCCC at King KAUH. Patients who had cardiac catheterization > 5 weeks after cardiac surgery were excluded from the study. The study was approved by the ethical committee of KAUH. Data collected include: Age, weight, diagnosis, type of surgery, indication of cardiac catheterization, type of cardiac catheterization, time from surgery, the need for redo surgery, the type of redo surgery, duration of mechanical ventilation, Inotropic Score (IS) &Vasoactive Inotropic Score (VIS), duration of ECMO support, duration of hospital and Pediatric Intensive Care Unit (PICU) admission, procedure complications and outcome (survival /death). IS is calculated as dopamine dose (μg/kg/min) + dobutamine dose (μg/kg/min) + 100 × epinephrine dose (μg/kg/min). VIS is calculated as IS + 10 × milrinone dose (μg/kg/min) + 10,000 × vasopressin dose (Units/kg/min) + 100 × norepinephrine dose (μg/kg/min)]8.
The success of the interventional procedures was also reported and defined for angioplasty (ballooning or stenting) as the increase in the vessel diameter to more than 75 % of adjacent normal vessel or at least 50% increase from the pre-procedural diameter. For occlusion procedures success was defined as absence of significant residual shunting seen by angiography 7,9. All procedures were performed during the same admission for cardiac surgery.