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Slow and fast lung compartments in cystic fibrosis measured by nitrogen multiple-breath washout.

Artikel i vetenskaplig tidskrift
Författare Per M. Gustafsson
P D Robinson
Marita Gilljam
Anders Lindblad
Birgitta Houltz
Publicerad i Journal of applied physiology (Bethesda, Md. : 1985)
Volym 117
Nummer/häfte 7
Sidor 720-9
ISSN 1522-1601
Publiceringsår 2014
Publicerad vid Institutionen för medicin
Institutionen för kliniska vetenskaper, Avdelningen för pediatrik
Institutionen för medicin, avdelningen för invärtesmedicin och klinisk nutrition
Sidor 720-9
Språk en
Länkar dx.doi.org/10.1152/japplphysiol.012...
Ämneskategorier Pediatrik

Sammanfattning

Imaging studies describe significant ventilation defects across a wide range of cystic fibrosis (CF) related lung disease severity. These are unfortunately poorly reflected by phase III slope analysis-derived Scond and Sacin from multiple-breath washout (MBW). Methodology extending previous two-lung compartment model-based analysis is presented describing size and function of fast- and slow-ventilating lung compartments from nitrogen (N2) MBW and correlation to obstructive lung disease severity. In 37 CF subjects (forced expiratory volume in 1 s [FEV1] mean [SD] 84.8 [19.9] % predicted; abnormal lung clearance index [LCI] in 36/37, range 7.28-18.9) and 74 matched healthy controls, volume and specific ventilation of both fast and slowly ventilated lung compartments were derived from N2-based MBW with commercial equipment. In healthy controls lung emptying was characterized by a large compartment constituting 75.6 (8.4)% of functional residual capacity (FRC) with a specific ventilation (regional alveolar tidal volume/regional lung volume) of 13.9 (3.7)% and a small compartment with high specific ventilation (48.4 [15.7]%). In CF the slowly ventilated lung compartment constituted 51.9(9.1)% of FRC, with low specific ventilation of 5.3 (2.4)%. Specific ventilation of the slowly ventilated lung compartment showed stronger correlation with LCI (r(2) = 0.70, P < 0.001) vs. Sacin (r(2) = 0.44, P < 0.001) or Scond (no significant correlation). Overventilation of the fast lung compartment was no longer seen in severe CF lung disease. Magnitude and function of under- and overventilated lung volumes can be derived from routine N2 MBW in CF. Reported values agree with previous modelling-derived estimates of impaired ventilation and offer improved correlation to disease severity, compared with SnIII analysis.

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