Figure 1.
Time course of changes in arterial blood gas values. The values for umbilical arterial pH (A), partial pressure of carbon dioxide (PaCO2, B), and partial pressure of oxygen (PaO2, C) are shown for the first 150 minutes of the study, up to the point of pulmonary physiological assessments. There were significant differences between the constant pressure (open symbols) and 8-L/minute bias flow bubble (closed symbols) continuous positive airway pressure group for pH, PaCO2, and PaO2. *p < 0.05; **p < 0.01. Specific p values are not included in the graph, for clarity, but are provided in Table E2 of the online supplement.