Predictors of Mortality in Preterm Infants with Respiratory Distress Syndrome: A Retrospective Analysis

Aims: The aim of this study was to evaluate clinical outcomes and identify predictors of mortality in preterm infants with respiratory distress syndrome (RDS) treated in a tertiary Pediatric Intensive Care Unit (PICU). Methods: This retrospective study included 86 preterm infants diagnosed with RDS and treated between January 2015 and December 2024. Clinical data were extracted from medical records and included demographic and anthropometric parameters, perinatal history, associated neonatal diagnoses, ventilation type and duration, surfactant administration, use of inotropes and antibiotics, cranial ultrasound findings, and PICU length of stay. Results: Mortality was 18.6%, with the highest rates observed in extremely preterm infants (<28 weeks) and those with extremely low birth weight (<1000 g). Several clinical variables were significantly associated with survival: gestational age, birth weight, birth length, and Apgar scores at 1 and 10 min (all p ≤ 0.005). In multivariable logistic regression, each additional week of gestation (OR 0.72, 95% CI 0.59-0.87), higher birth weight (OR 0.998, 95% CI 0.997-0.999), and higher Apgar scores (OR 0.69 at 1 min; OR 0.60 at 10 min) were significantly associated with survival. Ventilation was required in 97.7% of infants, and outcomes differed significantly by ventilation modality (p = 0.021), with the lowest mortality observed in those treated with combined invasive and non-invasive ventilation. Resuscitation (p < 0.001) and inotropic support (p < 0.001) were strongly associated with death. Length of PICU stay and duration of ventilation were significantly shorter in non-survivors (p < 0.05). Surfactant therapy was used in 79.1% of infants but was not significantly associated with survival. Conclusions: Gestational age, birth weight, and early postnatal condition were the strongest predictors of survival in preterm infants with RDS. Non-invasive and combined ventilation were associated with better outcomes, whereas the need for resuscitation and inotropes indicated markedly higher mortality. These results highlight the importance of early stabilization and optimized respiratory support in improving outcomes.