Spectrum of chronic lung disease in a population of newborns with extremely low gestational age.
OBJECTIVE
To determine how the ability to oxygenate the blood develops after birth in infants of extremely low gestational age (ELGANs) and to find risk factors for chronic lung disease.


METHODS
A prospective, population-based, cohort study was undertaken in one tertiary-care centre. The alveolar-arterial oxygen pressure difference (AaDO(2)) was monitored.


RESULTS
Of 41 survivors, 21 had a period of normal lung function in the first week of life, after which oxygenation deteriorated. Low gestational age and low Apgar score at 5 min were found to be strong and independent predictors of AaDO(2) in the first month of life. Mechanical ventilation did not appear as a risk factor. Lung function at 36 weeks of gestation and duration of oxygen treatment could be better predicted by the severity of lung disease in the first month than by gestational age at birth.


CONCLUSIONS
Difficulty in oxygenation was a general observation in ELGANs and not only a particular subset. Gestational age and Apgar score were independent predictors of the degree of difficulty over the first month of life. As oxygenation failure often developed after a few days, the process may be possible to treat or prevent once the pathogenesis is known.
Department of Paediatrics, The Sahlgrenska Academy at University of Gothenburg, Sweden. ola.hjalmarson@pediat.gu.se
O
O
Hjalmarson
H
H
Brynjarsson
S
S
Nilsson
K L
KL
Sandberg
D001034:Apgar Score; D001785:Blood Gas Monitoring, Transcutaneous; D002821:Chorioamnionitis / Q000453:epidemiology; D002908:Chronic Disease; D015897:Comorbidity; D004374:Ductus Arteriosus, Patent / Q000453:epidemiology / Q000601:surgery; D005260:Female; D006801:Humans; D062071:Infant, Extremely Premature; D007231:Infant, Newborn; D007235:Infant, Premature, Diseases / Q000453:epidemiology*; D008171:Lung Diseases / Q000453:epidemiology*; D008297:Male; D015999:Multivariate Analysis; D011247:Pregnancy; D011446:Prospective Studies; D012121:Respiration, Artificial; D012307:Risk Factors; D013548:Sweden / Q000453:epidemiology