Objective: Non-surgical adjustment of Pulmonary artery band (PAB) diameter is an attractive method for increasing pulmonary blood flow (PBF). This study assessed the feasibility/safety of band loosening/debanding by balloon dilatation. Methods: All pts who underwent PAB balloon dilatation (PABB) between 10/2006 & 4/2008 were reviewed. At surgery, PAB diameter was fixed with hemoclips in a manner designed to permit progressive dislodgement of the clips in a controlled manner. A balloon inflated at the PAB site resulted in its gradual loosening until desired clinical outcome is achieved. Results: Eight PABB were performed in 6pts (2pts had 2 dilations). Mean age at catheterization 6 months (range 3-14) (mean weight 5 kg). Median time from PAB placement 4.5 months (range 1.8-15). Diagnosis at PAB: CoA/hypoplastic transverse arch with multiple apical muscular VSDs (n=4) and functional single ventricle with un-protected PBF (n=2). PABB required a single balloon in 7 (serial dilations in 5) and double balloon in 1. Balloons ranged from 4-12 mm; inflated to 8-24 atms. The procedure was successful in all patients. Saturation increased from a mean of 76 to 89% (p=0.001). Gradient decreased from a mean of 67 to 36mmHg (p=0.001). Angiographically measured band site diameter increased from a median of 3.8 to 6.7 mm (p=0.002). One patient had a re-perfusion injury, requiring mechanical ventilation for 5 days. There were no other complications. Conclusion: PABB is a safe and effective method for increasing PBF in a staged/controlled manner. PABB may eliminate the need for surgical removal in some cases.