Details of the treatment protocol, including salient preoperative, intraoperative, and postoperative features of the HLHS treatment algorithm, implemented in January 2014. AVVR indicates atrioventricular valve regurgitation; CPB, cardiopulmonary bypass; CVP, central venous pressure; DO
2, systemic oxygen delivery; ECLS, extracorporeal life support; EGA, estimated gestational age; ETT, endotracheal tube; HLHS, hypoplastic left heart syndrome; MAP/MABP, mean arterial blood pressure; mBTS, modified Blalock‐Taussig shunt; MUF, modified ultrafiltration; OHT, orthotopic heart transplantation; PAB, pulmonary artery band; PD, peritoneal dialysis; PDA, patent ductus arteriosus; PGE, prostaglandin E1; PRBC, packed red blood cells; Qp/Qs, ratio of pulmonary to systemic blood flow; S1P, stage 1 palliation; SvO2, systemic venous oxyhemoglobin saturation; TR, tricuspid valve regurgitation; TXA, tranexamic acid; VO
2, oxygen consumption.