RT Journal Article SR Electronic T1 Association between blood carboxyhemoglobin level and bronchopulmonary dysplasia in extremely low birthweight infants JF Journal of Investigative Medicine JO J Investig Med FD BMJ Publishing Group Ltd SP 68 OP 72 DO 10.1136/jim-2021-001967 VO 70 IS 1 A1 Thea Tagliaferro A1 Rowena Cayabyab A1 Rangasamy Ramanathan YR 2022 UL http://hw-f5-jim.highwire.org/content/70/1/68.abstract AB Carboxyhemoglobin (CO-Hb) can be endogenously formed in the presence of oxidative stress and may be elevated in inflammatory lung disease. There is lack of evidence of its relationship with the development of bronchopulmonary dysplasia (BPD) in extremely low birthweight (ELBW) infants. The objective of the study is to evaluate the relationship between blood CO-Hb levels in the first 14 days of life (DOL) in ELBW infants and the development of BPD at 36 weeks postmenstrual age (PMA). This is a retrospective cohort study of 58 ELBW infants born at LAC-USC Medical Center between June 2015 and and June 2019 who survived to 36 weeks PMA. CO-Hb values were collected daily from DOL 1 to DOL 14. BPD definition using the recent 2019 NICHD criteria was used. Multivariate logistic regression was performed to determine the association between blood CO-Hb levels and BPD. Receiver operator curve was used to evaluate the ability of the median fraction of inspired oxygen (FiO2) level used at DOL 11–14 in discriminating absent to mild BPD versus moderate to severe BPD. 58 ELBW infants were included in the study. 24 (41%) were diagnosed with moderate to severe BPD, while 34 (59%) were diagnosed with no to mild BPD. Severity of BPD was fairly discriminated by FiO2 at DOL 11–14, but not with CO-Hb levels at any point within the first 14 DOL. The role and mechanism of CO-Hb production in this population need to be further studied.Data may be obtained from a third party and are not publicly available. Data were collected from an institutional neonatal database (Neonatal Information Systems (NIS 5), Rosemont, Philadelphia).