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Perinatal factors and the development of chronic lung disease in preterm infants: a case control study
E D Watson1, D J Henderson-Smart, G N Storey
1Perinatal Medicine, King George V Memorial Hospital, Sydney, New South Wales, Australia.
Insights
This study found that shorter gestational age and longer oxygen therapy duration are key factors in developing chronic lung disease (CLD) in neonates. Male sex, patent ductus arteriosus, and pneumothorax were not significant risk factors for CLD.
Area of Science:
- Neonatal Medicine
- Pediatric Pulmonology
- Perinatology
Background:
- Chronic lung disease (CLD) is a significantcomplication in premature neonates.
- Identifying risk factors for CLD is crucial for improving outcomes in high-risk infants.
Purpose of the Study:
- To investigate factors contributing to the development of chronic lung disease (CLD) in neonates.
- To analyze the association between various clinical factors and CLD in premature infants.
Main Methods:
- A case-control study was conducted on neonatal survivors born between 25-32 weeks gestation.
- Infants with respiratory failure were assessed for CLD development.
- Matched controls were used to compare clinical parameters between infants with and without CLD.
Main Results:
- Shorter gestational age was strongly associated with CLD development.
- Neonates with CLD required significantly longer oxygen therapy, higher maximum FiO2, and more intermittent positive pressure respiration (IPPR).
- Lower mean birthweight, arterial cord pH, and base excess were observed in the CLD group. Male sex, patent ductus arteriosus, and pneumothorax were not significant risk factors.
Conclusions:
- Prolonged oxygen and ventilator support are confirmed associations with CLD.
- Gestational age and severity of respiratory support are primary determinants of CLD, challenging previous associations with other factors.
Abstract:
A case control study of neonates was performed to determine those factors contributing to the development of chronic lung disease (CLD). During the 5 years 1981-84 there were 487 neonatal survivors at gestations of 25-32 weeks; 391 of these developed respiratory failure (oxygen therapy required for more than 6 h). Fifty-six of the latter developed CLD (oxygen therapy required for more than 28 days and a coarse reticular pattern on chest X-ray). These neonates were predominantly of the shortest gestational ages, regardless of the initial chest X-ray diagnosis. Forty-three of these infants with CLD were matched for gestation and initial chest X-ray appearance (respiratory distress syndrome, n = 20; normal, n = 15; non-specific, n = 8) with 42 control infants. The mean duration of oxygen therapy (P less than 0.001), maximum FiO2 (P less than 0.001), incidence (P less than 0.01) and duration of intermittent positive pressure respiration (IPPR; P less than 0.05) and peak IPPR (P less than 0.05) were significantly greater in the CLD group. Mean birthweight (P less than 0.001), arterial cord pH (P less than 0.05) and base excess (P less than 0.05) were significantly lower in the CLD group. Factors that were not statistically significant in the development of CLD included antenatal fetal heart rate abnormality, hypertensive disease of pregnancy, acute intrauterine infection (chorioamnionitis or umbilical vasculitis), administration of antenatal steroids, sex, patent ductus arteriosus and pneumothorax. The association between CLD and ventilator/oxygen therapy is confirmed. Contrary to other reports, male sex, clinical patent ductus arteriosus and pneumothorax were not associated with CLD.