Source: Annual Congress 2003 - Assessing airway function: practicalities and clinical applications
Disease area: Airway diseases

Abstract

Aim: We investigated the influence of the type of mouthpiece on bodyplethysmography and forced spirometry: a so-called freeflow mouthpiece where the tongue is in a fixed position (FM) was compared with a conventional rubber mouthpiece (TM).
Methods: The airwayresistance (Raw), specific conductance (sGaw), peak expiratory flow (PEF) and forced expiratory flow in one second (FEV1) were measured with a Vmax22-system (SensorMedics, Bilthoven, NL) in 40 patients referred for routine lungfunction testing. The patients were divided into two groups based on the FEV1%VC: group A with normal spirometry (17M:3F, 47±16 yrs, FEV1= 101±13%pred.) and group B with bronchial obstruction (12M:8F, 68±11 yrs, FEV1= 56±13%pred). In each subject three acceptable flowvolumecurves (according to Eur Respir J 1993;3:14-18) and three acceptable airwayresistancecurves were obtained with FM and TM, in random order. The highest PEF and FEV1 and the mean Raw and sGaw was used for analysis.
Results: A significantly higher PEF of 2% was found when FM was compared to RM in both groups. No effect was found on FEV1, Raw and sGaw. The intra-individual coefficients of variation (CoV) of PEF, FEV1, sGaw and Raw as obtained with FM and TM were not significantly different.
Conclusion: The use of FM results in a significantly higher PEF compared to the conventionally used RM in both groups. The type of mouthpiece did not affect FEV1, Raw, sGaw and the reproducability of PEF, FEV1, sGaw and Raw.

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Citations should be made in the following way:
M. Franssen, Y. Valkema, E. Snoey, J. Kroes (Groningen, Rotterdam, The Netherlands). The type of mouthpiece used affects the peak expiratory flow. Eur Respir J 2003; 22: Suppl. 45, 3624

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