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Correspondence
Reasons for heterogeneous change in LCI in children with cystic fibrosis after antibiotic treatment
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  1. Sophie Yammine1,2,
  2. Anja Bigler1,
  3. Carmen Casaulta1,
  4. Florian Singer1,3,
  5. Philipp Latzin1,2
  1. 1Division of Respiratory Medicine, Department of Pediatrics, University Children's Hospital of Bern, Bern, Switzerland
  2. 2University Children's Hospital of Basel UKBB, Basel, Switzerland
  3. 3University Children's Hospital of Zurich, Zurich, Switzerland
  1. Correspondence to Professor Philipp Latzin, University Children's Hospital UKBB, Spitalstrasse 33, Postfach, Basel 4031, Switzerland; philipp.latzin{at}ukbb.ch

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With great interest we read the paper of Horsley et al.1 In their prospective observational study they showed significant improvement in indices of ventilation capacity (spirometry) and ventilation heterogeneity (multiple-breath washout (MBW)) after a course of intravenous antibiotics in subjects with cystic fibrosis (CF). There was considerable heterogeneity of lung clearance index (LCI) response as observed previously.2 Here we aim to disentangle underlying physiological mechanisms of this heterogeneous response.

We assessed changes of lung function parameters before and after 23 courses of intravenous antibiotics in 19 children with CF aged 5–18 years. Children performed arterial blood oxygen measurement, nitrogen MBW,3 , …

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