RESUMEN

Background: Our objective was to examine the clinical presentation, echocardiographic findings, and outcomes of newborns presenting with left ventricle (LV) dysfunction in the first 48 hours of life without perinatal asphyxia or structural heart disease. We hypothesize that LV dysfunction may occur due to maladaptation to extrauterine life. Methods: This is a retrospective cohort analysis including infants born in a quaternary perinatal centre. Late preterm and term neonates who were diagnosed with left ventricular dysfunction at less than 48 hours of life were identified using an echocardiography clinical laboratory's database and extracorporeal life support database. LV dysfunction was defined as m-mode fractional shortening (FS) <28% or ejection fraction (EF) <50% on echocardiography or reduced function reported by a cardiologist. Data extracted included patient & maternal demographics, echocardiogram parameters, clinical status, and medications. The primary outcome measure was time to recovery of LV function based on echocardiography. Results: Of the 69 patients identified, 19 patients were included in the final analysis. The mean gestational age was 38 weeks. Thirteen (68%) infants did not have an underlying cause identified despite extensive work-up. Four (21%) infants had exposure to maternal illicit drug use during pregnancy. Three infants died, and all infants without identifiable etiologies had recovery of LV function within 14 days of life. Conclusions: LV dysfunction can occur during the abrupt transition from fetal to neonatal circulation and can be associated with maternal illicit drug use.