Seventy Years Managing Hypoplastic Left Heart Syndrome - What has been Learned and What Remains to be Learned.

In this review, we describe the evolution of the surgical management of Hypoplastic Left Heart Syndrome from its initial description through the development of contemporary interventional strategies. Through this account, we highlight lessons learned from prior comparisons and how these apply to the current debate, Norwood vs Hybrid palliations. The Congenital Heart Surgeons Society - Critical Left Ventricular Outflow Tract Obstruction Cohort has played an important role in defining outcomes and shows promise for future understanding.