LAUSR

INTRODUCTION To investigate the relevance of plasma levels of apelin and other risk factors in infants with retinopathy of prematurity (ROP). METHODS This was a single-center cross-sectional study. Fifty preterm infants with ROP and 50 preterm infants without ROP were enrolled. The analysis included evaluation of gestational age, birth weight, and measurement of plasma concentrations of apelin, vascular endothelial growth factor (VEGF), erythropoietin (EPO), and insulin-like growth factor (IGF-1) using enzyme-linked immunosorbent assay. RESULTS The mean BW and GA of babies with ROP were considerably lower than those without ROP (P < 0.001, P = 0.003, respectively). Plasma levels of VEGF, EPO, and IGF-1 were all lower in babies with ROP (all P < 0.001), while plasma apelin levels were greater (P < 0.001). We compared the sensitivity and selected the best cut-offs while keeping the specificity constant (80.0%). Among all the criteria, plasma apelin levels had the best sensitivity (72%), with a 21.08 pg/mL cut-off. Multivariable logistic regression analyses showed that the plasma level of apelin was the only parameter associated with ROP (P = 0.02, OR = 16, CI = 95%: 1.54-166.53). The AUC of the multivariable regression model that comprised GA, BW alone was 0.67, while the model that included apelin was 0.90. CONCLUSIONS Plasma apelin level demonstrated good sensitivity and specificity with regard to the association of ROP, the inclusion of apelin may be a promising factor to include in screening criteria.