Journal of perinatology-http://www.nature.com/jp/journal/vaop/ncurrent/abs/jp201014a.html
Serial echocardiograms obtained in 115 ELBW at less than or equal to10 day postnatal were examined to estimate PDA size using the PDA:left pulmonary artery (LPA) diameter ratio: greater than or equal to1 indicated a large PDA.
Neonates with moderate to large PDA at less than or equal to4 day had 15-times greater likelihood of requiring treatment for sPDA than those with a small PDA (95% confidence interval (CI): 5.6–41). Sensitivity, specificity and PPV of the PDA:LPA at <27 weeks was 80, 86 and 92%, respectively.
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