High serum creatinine in early life of preterm infants predicts the severe retinopathy of prematurity: a retrospective single-centre study
Abstract BACKGROUND Hypoxia and anemia are among the risk factors for retinopathy of prematurity (ROP). The kidneys are important organs that sense oxygen levels and regulate red blood cell synthesis via erythropoietin production. We investigated the contribution of abnormal renal function (reflected by serum creatinine [SCr] levels) to severe ROP in very low birth weight (VLBW) infants. METHODS In the present study, we enrolled 242 VLBW infants of gestational age (GA) ranging between 25 and 32 weeks who were admitted at Soonchunhyang Cheonan University Hospital between Nov 2014 and Dec 2019. The cut-off value for normal SCr for each GA group based was defined as 95th percentile of SCr based on a reference chart developed in a previous study. Risk factors for ROP requiring treatment were analyzed using logistic regression. RESULTS Of the 242 infants, 63 (26%) were high SCr group and 30 (12.4%) infants had ROP requiring treatment. GA (odds ratio 0.38, 95% confidence interval 0.23–0.61) and high SCr group (4.68 [1.10–19.90]) were independent factors for ROP requiring treatment. CONCLUSIONS In VLBW infants, high SCr within the first 4 weeks after birth is one of the risk factors for ROP requiring treatment.