Longitudinal evaluation of airway function 21 years after preterm birth

American Journal of Respiratory and Critical Care Medicine
Indra NarangAndrew Bush

Abstract

There are limited longitudinal data about respiratory morbidity and lung function after preterm birth into adulthood. To determine the evolution of respiratory symptoms, spirometry, and airway hyperresponsiveness of ex-preterm subjects from childhood into adulthood. Ex-preterm subjects (median birth weight, 1,440 g; median gestation, 31.5 wk), recruited at birth (not treated with surfactant), had excess respiratory symptoms, airway obstruction, and increased airway hyperresponsiveness in mid-childhood. At a median age of 21.7 years, 60 of these subjects (the index study group) and 50 healthy term control subjects were recruited to determine respiratory morbidity and spirometry. Respiratory symptom questionnaire, spirometry, and methacholine challenge test. The index study group had significantly more respiratory symptoms (16 of 60) than did control subjects (4 of 50) (odds ratio, 4.2; 95% confidence interval, 1.3 to 13.5; P = 0.01), but no significant difference in measured spirometry. Specifically, in the index study group and control subjects, the mean z scores (95% confidence interval of the group difference) for the FEV(1) were -0.60 and -0.58 (-0.44 to 0.49), respectively (P = 0.92); for the forced mid-expiratory flow they...Continue Reading

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