BACKGROUND AND AIMS: The measurement of airway resistance using the interrupter technique (R(int)) is feasible in preschool children and other subjects unable to undertake spirometry. This makes it potentially useful for the measurement of lung function in these groups. Commercial devices use different algorithms to measure pressure and flow from which R(int) is derived. This study provides normative values for British children using devices from a single manufacturer. METHODS: R(int) was measured in 236 healthy children of three ethnic groups (Afro-Caribbean and black African, Bangladeshi, and white British) aged 2-10 years using Micro Medical devices. Software in the devices calculated R(int) from pressure measured by the two point, back extrapolation method from the pressure transient during valve closure, with flow measured just before valve closure. RESULTS: R(int) is related to both age and height, but when age is allowed for there is not a significant relation with height. Neither gender nor any of the ethnicities studied was significantly related to R(int). DISCUSSION: These measurements in healthy children using this technique may be used as reference data for similar populations.
BACKGROUND AND AIMS: The measurement of airway resistance using the interrupter technique (R(int)) is feasible in preschool children and other subjects unable to undertake spirometry. This makes it potentially useful for the measurement of lung function in these groups. Commercial devices use different algorithms to measure pressure and flow from which R(int) is derived. This study provides normative values for British children using devices from a single manufacturer. METHODS: R(int) was measured in 236 healthy children of three ethnic groups (Afro-Caribbean and black African, Bangladeshi, and white British) aged 2-10 years using Micro Medical devices. Software in the devices calculated R(int) from pressure measured by the two point, back extrapolation method from the pressure transient during valve closure, with flow measured just before valve closure. RESULTS: R(int) is related to both age and height, but when age is allowed for there is not a significant relation with height. Neither gender nor any of the ethnicities studied was significantly related to R(int). DISCUSSION: These measurements in healthy children using this technique may be used as reference data for similar populations.
Authors: E Lombardi; P D Sly; G Concutelli; E Novembre; G Veneruso; G Frongia; R Bernardini; A Vierucci Journal: Thorax Date: 2001-09 Impact factor: 9.139
Authors: Donald H Arnold; Tebeb Gebretsadik; Thomas J Abramo; James R Sheller; Donald J Resha; Tina V Hartert Journal: Emerg Med J Date: 2011-05-17 Impact factor: 2.740
Authors: Rebekka Veugelers; Elsbeth A C Calis; Corine Penning; Arianne Verhagen; Roos Bernsen; Jan Bouquet; Marc A Benninga; Peter J F M Merkus; Hubertus G M Arets; Dick Tibboel; Heleen M Evenhuis Journal: BMC Pediatr Date: 2005-07-19 Impact factor: 2.125