PEDIATRICS Vol. 61 No. 6 June 1978, pp. 842-846
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Late Effect of Nocturnal Mist Tent Therapy Related to the Severity of Airway Obstruction in Children With Cystic Fibrosis

Michel A. Bureau M.D.1, Dianne M. McDougall B.Sc.1, Pierre H. Beaudry M.D.1, and Mimi M. Belmonte M.D.1

1 Departments of Metabolism and Respiratory Function, McGill University, Montreal Children's Hospital Research Institute, Montreal

To evaluate the long-term effect of nocturnal mist tent therapy on the progression of airway obstruction in children with cystic fibrosis (CF) of varying severity, two matched groups each consisting of 24 children with CF were studied during 18 months on mist tent therapy and 18 months off therapy. The progression in airway obstruction was measured by change in serial measurements of maximal midexpiratory flow (MMEF), from which a regression equation of MMEF against time was obtained for each individual. Changes in MMEF value with or without therapy were compared in patients matched for severity of disease as indicated by initial MMEF values.

For the group as a whole no differences were found in the progression of the airway obstruction whether the patients received mist tent therapy or not. This therapy failed to benefit any of the groups of children with CF who had early, moderate, or advanced airway obstruction as judged from their initial MMEF value.

It is concluded that nocturnal mist tent therapy neither decreases airway obstruction nor prevents its progression in children with CF.

Submitted on February 23, 1977
Accepted on October 19, 1977