What echocardiographic indices are predictive of patent ductus arteriosus surgical closure in early preterm infants? A prospective multicenter cohort study.

Background: No echocardiographic indices for predicting the need for preterm patent ductus arteriosus (PDA) surgery have been tested with an adequate sample size. We tested the hypothesis that some echocardiographic indices have better predictive ability for the need for PDA surgery.

Methods: We prospectively collected data from infants with gestational ages between 23 and 29 weeks at 34 Japanese neonatal intensive care units over 14 months. Data points were 1, 3, 7, and 14 days of age and, if applicable, before PDA surgery. We assessed five echocardiographic indices. Volume and dimension indices were adjusted for birth body weight (BBW). For each echocardiographic index, the worst value among all data points in nonsurgical patients or the value just before surgery in surgical patients was used. Multivariate logistic regression was applied with adjustment for clinical status.

Results: In total, 691 patients were analyzed, of whom 61 (8.8%) underwent surgery, as guided using the criteria in the protocol. The areas under the receiver-operating characteristic curve for PDA diameter (0.86) and PDA diameter/BBW (0.86) were the largest, followed by those of left pulmonary artery end-diastolic velocity (LPAedv) (0.80), and left atrial volume/BBW (0.80).

Conclusions: Considering the measurement's easiness and independence of body size, PDA diameter and LPAedv may serve as useful indices for assessing the need for PDA surgery in early preterm infants.