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J Cyst Fibros. 2013 Dec;12(6):567-74. doi: 10.1016/j.jcf.2013.05.010. Epub 2013 Jun 19.

Treatment response of airway clearance assessed by single-breath washout in children with cystic fibrosis.

Author information

1
Division of Respiratory Medicine, Department of Pediatrics, University Hospital of Bern, 3010 Bern, Switzerland.

Abstract

BACKGROUND:

We studied the ability of 4 single-breath gas washout (SBW) tests to measure immediate effects of airway clearance in children with CF.

METHODS:

25 children aged 4-16 years with CF performed pulmonary function tests to assess short-term variability at baseline and response to routine airway clearance. Tidal helium and sulfur hexafluoride (double-tracer gas: DTG) SBW, tidal capnography, tidal and vital capacity nitrogen (N2) SBW and spirometry were applied. We analyzed the gasses' phase III slope (SnIII--normalized for tidal volume) and FEV1 from spirometry.

RESULTS:

SnIII from tidal DTG-SBW, SnIII from vital capacity N2-SBW, and FEV1 improved significantly after airway clearance. From these tests, individual change of SnIII from tidal DTG-SBW and FEV1 exceeded short-term variability in 10 and 6 children.

CONCLUSIONS:

With the tidal DTG-SBW, an easy and promising test for peripheral gas mixing efficiency, immediate pulmonary function response to airway clearance can be assessed in CF children.

KEYWORDS:

CF; CO(2); CR; Children; Cystic fibrosis; DTG; FEV(1); He; ICC; LCI; MBW; MEF(25–75); N(2); PFT; PT; Physical therapy modalities; Pulmonary ventilation; Respiratory function test; SBW; SF(6); SIII; SnIII; carbon dioxide; chest physiotherapy; coefficient of repeatability (between-test repeatability); cystic fibrosis; double-tracer gas: 26.3% helium and 5% sulfur hexafluoride; forced expiratory volume in one second; helium; intra-class correlation coefficient (intra-test repeatability); lung clearance index; mean expiratory flow between 25 and 75% of expired volume; multiple-breath washout test; nitrogen; pulmonary function test; single-breath washout; slope of alveolar phase III from gas washout curves; sulfur hexafluoride; tidal volume normalized phase III slope from gas washout curves

PMID:
23790270
DOI:
10.1016/j.jcf.2013.05.010
[Indexed for MEDLINE]
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