Figure 2.

Admission to ICU and treatment escalations at different stages of pregnancy. This figure is based on the clinical assumption that treatments are gradually escalated until highest treatment required is reached; antenatal and postpartum: numbers presented as flow chart; intrapartum: total number of patients receiving ICU treatment during childbirth; intensive care unit (ICU), insufflation of oxygen (O²), non-invasive ventilation (NIV), invasive ventilation, and extracorporeal membrane oxygenation (ECMO).