Am. J. Respir. Crit. Care Med., Volume 156, Number 4, October 1997, 1178-1184

Bronchial Lability and Responsiveness in School Children Born Very Preterm

ANNA S. PELKONEN, ARJA L. HAKULINEN, and MARKKU TURPEINEN

Department of Allergic Diseases, Helsinki University Central Hospital, and Helsinki City Maternity Hospital, Helsinki, Finland

We evaluated bronchial lability and responsiveness in 29 prematurely born children (birth weight < 1,250 g) 8 to 14 yr of age, 12 with histories of bronchopulmonary dysplasia (BPD). Flow-volume spirometry, a bronchodilator test, and histamine challenge at the office and home monitoring of peak expiratory flow (PEF) values twice daily for 4 wk with and without a ₂-agonist were performed with a novel device, the Vitalograph Data Storage Spirometer. The spirometric values at the office and the results of home monitoring were compared with those for a control group of children born at term. All spirometric values except FEV₁/FVC were significantly lower in the BPD group than in the non-BPD group (p < 0.0001). Ten children (83%) in the BPD group and four (24%) in the non-BPD group had subnormal spirometric values at the office, indicating bronchial obstruction. Of the children with obstruction, 79% reported respiratory symptoms during the preceding year, and 57% had increased diurnal PEF variation and/or responded to administration of a ₂-agonist during home monitoring or at the office. The BPD children were significantly more responsive to histamine than the non-BPD children (p = 0.002). All spirometric values were significantly lower in both preterm groups than in the control group born at full term (p < 0.01). In conclusion, regardless of BPD, bronchial obstruction, bronchial lability, and increased bronchial responsiveness are common in prematurely born children of school age.

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