784 Seeking for Definitions of Poor Perfusion States (PPS) In Low Birth Weight Infants (LBWI) (Part I)

Background and Aims Echocardiography-derived low superior vena cava flow (SVCF) associates intraventricular haemorrhage, neurodisability and death. The weaknesses of the method relate to its variability. We aim to explore the relationship between two SVCF cut-off values to define PPS in LBWI and the patients’ short-term neonatal co-morbidities. Methods One hundred LBWI [27.4 (2) wks; 1014 (316) g] who reached illness score below threshold, underwent early (< 12h) and serial echocardiography for the first 96hs after birth. The primary outcome was low SVCF prevalence according to two thresholds: < 41 ml/k/min and [< 41 ml/k/min + SVCF repeatability index (RI)](RI is twice the standard deviation of the differences divided by the mean of all the measures). Secondary outcomes were short-term neonatal clinical outcomes in relation to SVCF status. Results SVCF< 41 ml/k/min prevalence was 30% and was associated with immaturity (p=0.02), corioamnionitis (0.007), advanced resuscitation at birth (0.004), lower Apgar scores (p