Study design (if review, criteria of inclusion for studies)
randomized trial
Participants
92 children and adolescents with bronchial asthma and cystic fibrosis
Interventions
filter (Pall PF 30)
Outcome measures
flow-volume curves and spirometry were registered in the whole body plethysmograph
Main results
Values measured with filter correlated closely to those registered without; individual values remained close to the line of identity. With high flow rates, however, there was a minimal tendency towards lower measurements with filter; this damping effect was flow-dependent and remained of a clinically insignificant dimension.