Neonatal Transcatheter Closure of a Large Pulmonary Arteriovenous Fistula with a KONAR-MF™ VSD Occluder.

Pulmonary arteriovenous fistulas (PAVFs) are rare congenital anomalies characterized by abnormal vascular connections that bypass the capillary bed, causing hypoxemia, cyanosis, and systemic embolic risks. Early diagnosis and intervention are critical to prevent complications, particularly in neonates with severe right-to-left shunts. This report describes the first documented case of neonatal transcatheter closure of a large PAVF using a KONAR-MF™ VSD Occluder (MFO). A 1-day-old neonate with a prenatally diagnosed PAVF presented with oxygen saturation of 82%. Angiographic and echocardiographic assessments confirmed the presence of a large PAVF between the right pulmonary artery and right inferior pulmonary vein. The fistula was successfully closed using an 8 × 6 mm MFO device, with no complications. Post-procedure, oxygen saturation improved to 100%, and follow-up at 5 months demonstrated sustained closure. This report highlights the safety and versatility of the MFO occluder in complex cardiac cases, offering a minimally invasive alternative to surgical intervention.