Early Cardiac Catheterization in Children with Congenital Heart Disease on Postoperative Extracorporeal Membrane Oxygenation: Safety, Outcomes, and Clinical Management

Background: Extracorporeal membrane oxygenation (ECMO) is lifesaving in pediatric patients with respiratory and/or cardiovascular failure. Cardiac catheterization is an important diagnostic and therapeutic tool in patients with congenital heart disease supported by ECMO, allowing the assessment of residual lesions, hemodynamically significant anatomical abnormalities, and unexplained indications for ongoing ECMO support. The timing and clinical contribution of cardiac catheterization in these patients are still debated. Objective: This study aimed to evaluate the indications, safety, and impact of cardiac catheterization on clinical management in pediatric patients receiving postoperative ECMO support. Methods: This single-center, retrospective study examined 39 pediatric patients under the age of 18 who underwent postoperative cardiac catheterization with ECMO support between January 2022 and December 2025. Demographic data, procedure characteristics, and clinical outcomes were analyzed. Results: Of the 190 patients under postoperative ECMO support, 39 underwent catheterization. The median age of the patients was 2.5 months (range, 6 days–180 months) and median weight was 4.2 kg (range, 2.8–57 kg). The most frequent diagnoses were ventricular septal defect-pulmonary atresia (VSD-PA) in 20.5% (n = 8) and transposition of the great arteries (TGA) in 15.3% (n = 6). The indication for catheterization was to investigate the reason for ECMO placement in 26 patients (66.6%). Most patients underwent catheterization within the first 24 h after ECMO initiation. Patients who underwent catheterization represented a higher-risk subgroup, with a greater proportion of STAT 4-5 procedures (59% vs. 40%) compared with the overall ECMO cohort. Cardiac catheterization resulted in a change in clinical management in 25.6% of patients through catheter-based intervention or surgical revision. Survival in the catheterized subgroup was 12.8%, reflecting the high-risk nature of this population. Conclusions: Cardiac catheterization in pediatric patients on postoperative ECMO support can be performed with a low complication rate and can significantly alter clinical management. Cardiac catheterization should be considered an important diagnostic and therapeutic modality, particularly in the presence of suspected residual lesions or unexplained hemodynamic instability. Additionally, we recommend that cardiac catheterization be performed promptly within the first 24–48 h in this patient group on ECMO support.