Fig. 1
Scatter diagrams of COEC and ductal diameter for preterm infants who responded (gray circles) and non-responded (black circles) to ibuprofen treatment for PDA. Four timing points were plotted: 1 h prior to treatment (baseline, a) and 18–24 h post each dosage of ibuprofen (b, c and d, respectively). COEC, cardiac output by electrical cardiometry; PDA, patent ductus arteriosus