Figure 1:  Lombardy emergency cardiac surgery hub-and-spoke system during the coronavirus disease 2019 epidemic. This map shows the reorganization of the cardiac surgery system for emergency and urgent situations during the coronavirus disease-2019 outbreak in Lombardy: 4 adult (A–D) hubs and 1 paediatric (E) hub have been identified; satellite spoke centres (in numbers) are asked to transfer patients needing emergency/urgent surgery to their respective hubs.