Pulmonary Artery Banding — How It Works, Benefits & Recovery — Procedure Guide, Recovery & Risks | MyMedicPlus

Pulmonary artery banding (PA banding) is a palliative (non-corrective) cardiac surgical procedure used in paediatric cardiac surgery to reduce excessive pulmonary blood flow in infants and young children with large left-to-right intracardiac shunts — most commonly large ventricular septal defects (VSD), atrioventricular septal defects (AVSD), or other complex congenital heart anomalies. The procedure involves placing a band (a narrow tape or clip, typically a Gore-Tex or Teflon tape) around the main pulmonary artery trunk to create a partial obstruction that restricts the volume of blood flowing from the right ventricle into the pulmonary circulation. By artificially narrowing the pulmonary artery, PA banding reduces pulmonary blood pressure and flow to a level that protects the delicate pulmonary vascular resistance (PVR) from progressive remodelling and eventual irreversible elevation (Eisenmenger syndrome) that would occur from chronic exposure to excess pulmonary blood flow and pressure. PA banding is a staging strategy — not a cure — providing physiological stabilisation until the infant is old enough, large enough, or sufficiently medically optimised to tolerate the definitive intracardiac repair (VSD closure, AV canal repair, or other corrective procedure), typically at 3–6 months or when the infant reaches approximately 5–6 kg body weight.

PA banding is indicated in neonates and infants in whom a large left-to-right shunt is present but definitive repair is not immediately feasible or carries unacceptable risk. Primary indications include: large VSDs or AVSDs in critically ill, haemodynamically unstable neonates with severe pulmonary overcirculation (elevated pulmonary blood flow causing severe respiratory failure, failure to thrive, and recurrent chest infections) — where cardiopulmonary bypass for definitive repair at this age carries very high mortality; complex cardiac anomalies with multiple defects where staged palliation is the surgical strategy (e.g., double inlet left ventricle, pulmonary atresia with VSD, some forms of double outlet right ventricle); premature infants in whom the risks of cardiopulmonary bypass and definitive repair are prohibitive; patients with severe non-cardiac comorbidities (sepsis, hepatic failure, respiratory distress syndrome) precluding bypass at the time of presentation; and aortic coarctation or interruption with associated intracardiac defects where staged repair is preferred at some centres. The decision to band versus perform primary repair is determined by the congenital heart disease team (paediatric cardiologist and congenital cardiac surgeon) weighing the physiological severity, infant weight and maturity, and anatomy of the defect. Many high-volume centres now prefer primary repair even in small infants, and PA banding has become less frequently used with advances in neonatal cardiac surgery.

PA banding is performed under general anaesthesia with full monitoring (arterial line, SpO2, capnography, direct arterial blood pressure). The approach is typically a median sternotomy (the standard cardiac surgical incision) or left lateral thoracotomy — cardiopulmonary bypass is not required. The pericardium is opened and the main pulmonary artery is identified and dissected free from the aorta. A band of pre-measured Gore-Tex tape (approximately 2–3 mm wide and 2.5–3 cm per kg body weight in circumference) is passed around the main pulmonary artery and secured with a clip or suture. The tightness (degree of banding) is calibrated intraoperatively by monitoring: pulmonary arterial pressure distal to the band (via a needle in the pulmonary artery), right ventricular pressure (which should rise to approximately systemic level), transcutaneous oxygen saturation (SpO2 target 80–85% to allow adequate systemic cardiac output without excessive pulmonary flow), and echocardiographic assessment of RV function and pulmonary Doppler gradient across the band. The band is fixed to the pulmonary artery wall with sutures to prevent migration. Chest drains are placed and the chest is closed. The band remains in situ until the definitive repair, at which time the band is removed as part of the corrective operation and the pulmonary artery is reconstructed (patch augmentation if significant stenosis has developed).

PA banding effectively reduces pulmonary blood flow and pressure, preventing progressive pulmonary vascular disease and allowing safe staging of definitive repair to a time when the infant is physiologically more resilient. Infants with severe pulmonary overcirculation causing respiratory failure, recurrent pneumonia, and failure to thrive typically show significant clinical improvement within days to weeks of banding — improved respiratory status, reduced oxygen requirements, and resumed weight gain. Protection of pulmonary vascular resistance is the critical benefit: without banding (or early primary repair), unrestricted pulmonary blood flow at systemic or near-systemic pressure leads to irreversible pulmonary arteriopathy (Eisenmenger syndrome) within months to years, ultimately precluding corrective surgery and causing right heart failure and death. In-hospital mortality for the banding procedure itself is 2–5% in modern series at specialist congenital heart centres; overall mortality is higher in very premature infants (<1.5 kg) or those with associated non-cardiac anomalies. Outcomes of subsequent definitive repair are significantly improved in infants who have been successfully staged with PA banding compared to emergency primary repair in critically ill neonates.

Band-related complications include: band migration (proximal or distal) causing inadequate restriction, pulmonary artery distortion, or paradoxical pulmonary hypertension — requiring emergency revision; inadequate banding with persistent excessive pulmonary blood flow and ongoing pulmonary vascular damage; excessive banding causing right ventricular outflow tract obstruction, right heart failure, cyanosis, and decreased cardiac output — requiring immediate band loosening or removal; pulmonary artery stenosis or kinking from the band — requiring patch angioplasty at the time of definitive repair; and direct injury to adjacent structures (coronary arteries, aorta) during dissection. Low cardiac output syndrome from post-operative right ventricular failure requires aggressive inotropic support (milrinone, dopamine). Respiratory complications (atelectasis, pneumonia) are common in small infants. Paradoxical acidosis from inadequate pulmonary blood flow may occur in cyanotic congenital heart defects requiring specific planning. Band erosion into the pulmonary artery wall is a rare late complication. Overall, approximately 10–20% of banded patients require band revision before definitive repair due to under- or over-banding.

Following the procedure, infants are managed in the paediatric cardiac intensive care unit (PCICU) with ventilatory support, continuous saturation monitoring, and arterial blood pressure monitoring for 24–72 hours. Inotropic support (dopamine 5–10 mcg/kg/min, milrinone 0.25–0.5 mcg/kg/min) maintains cardiac output during the critical early post-operative period. Target oxygen saturations of 80–85% confirm appropriate band tightness; saturations below 75% suggest the band is too tight and may require revision. Feeding (via nasogastric tube initially) is restarted 24–48 hours post-operatively when haemodynamic stability is confirmed. Hospital stay is typically 5–10 days, longer in premature or critically ill infants. Infants are discharged on regular cardiology follow-up with echocardiographic monitoring of band gradient and right ventricular function. Planning for definitive corrective surgery typically occurs at 3–6 months of age, or when the infant reaches approximately 5–6 kg. At the definitive repair operation, the PA band is removed, the pulmonary artery is assessed for distortion and repaired if necessary, and the intracardiac defect is corrected under cardiopulmonary bypass.