Table_1_Primary hemostasis in fetal growth restricted neonates studied via PFA-100 in cord blood samples.docx

BackgroundPlatelet function of fetal growth restricted (FGR) neonates remains a field of debate. Platelet function analyzer (PFA-100) offers a quantitative in vitro assessment of primary, platelet-related hemostasis. Our aim was to examine platelet function using PFA-100 in FGR neonates and associate our results with perinatal parameters.MethodsPFA-100 was applied on 74 FGR neonates, 48 full-term (>37 weeks' gestation) and 26 preterm neonates (ResultsCOL/EPI CTs were prolonged in FGR (median 132 s, IQR 95–181 s) compared with control neonates (median 112.5 s, IQR 93–145 s), p = 0.04. Median COL/EPI CT for term and preterm FGR neonates was 126 s (IQR 90–157 s) and 137 s (IQR 104–203), respectively (p = 0.001), and COL/ADP CT was 70 s (IQR 62–80 s) for term and 75 s (IQR 68–82 s) for preterm FGR neonates (p = 0.08). Among FGR neonates, COL/EPI CT was related with delivery time (with preterm neonates exhibiting prolonged COL/EPI CTs), p = 0.05. No correlation was proved between both CTs and hematological parameters in FGR neonates.ConclusionFGR neonates showed impaired platelet function via PFA-100, with preterm FGR neonates confronting the greatest risk. Prolonged COL/EPI CTs in FGR neonates seemed to be independent of hematological parameters and could warn for closer evaluation during the first days of their lives.