Original Article: Other
Exhaled breath condensate purines correlate with lung function in infants and preschoolers
Article first published online: 21 MAY 2012
Copyright © 2012 Wiley Periodicals, Inc.
Volume 48, Issue 2, pages 182–187, February 2013
How to Cite
Patel, K., Davis, S. D., Johnson, R. and Esther, C. R. (2013), Exhaled breath condensate purines correlate with lung function in infants and preschoolers. Pediatr. Pulmonol., 48: 182–187. doi: 10.1002/ppul.22573
- Issue published online: 15 JAN 2013
- Article first published online: 21 MAY 2012
- Manuscript Accepted: 1 MAR 2012
- Manuscript Received: 4 OCT 2011
- CFF. Grant Number: PATEL10A0
- CFF. Grant Number: DAVIS08Y2
- NHLBI. Grant Number: 1K23HL089708
- NIEHS. Grant Number: P30 ES-10126
- mass spectrometry;
- infant pulmonary function testing;
- adenosine monophosphate
Although airway inflammation begins early in life in children with chronic respiratory diseases, current methods to assess this inflammation are invasive and entail significant risk. Measurement of exhaled breath condensate (EBC) purines and other biomarkers offers a less invasive method to assess airway inflammation; however, the feasibility and utility of EBC biomarkers in young children has not been established.
EBC was collected from children <3 years old with cystic fibrosis or other lung diseases during clinically indicated infant pulmonary function tests (iPFTs). EBC concentrations of the purine biomarkers adenosine (Ado), adenosine monophosphate (AMP), and the dilution marker urea were measured using mass spectrometry.
EBC was successfully collected (average volume 330 ± 170 µl) from preschool children (age 2.3 ± 0.8 years) in 15 of 17 iPFTs. No significant changes in oxygen saturation (96.9 ± 1.6 start, 96.8 ± 1.7 end, P = 0.389) or respiratory rate (35.2 ± 7.5 start, 34.6 ± 7.9 end, P = 0.443) were observed during collection. Ado and AMP were successfully measured in 13/15 samples [8 cystic fibrosis (CF)]. EBC AMP to Ado ratio (AMP/Ado) negatively correlated with forced expiratory volume at 0.5 sec (FEV0.5, r = −0.71, P < 0.01) and positively with the ratio of residual volume to total lung capacity (RV/TLC, r = 0.66, P = 0.015). These correlations remained statistically significant in the subset with CF.
EBC can be safely collected and analyzed in preschool children using commercially available equipment. The EBC AMP/Ado ratio correlates with measures of infant lung function and may be a less invasive means of monitoring airway inflammation in this population. Pediatr Pulmonol. 2013; 48:182–187. © 2012 Wiley Periodicals, Inc.