Significance of Intraindividual Changes in Maximum Expiratory Flow Volume and Peak Expiratory Flow Measurements

SummaryAs part of a population study on chronic lung disease in the Netherlands, an investigation is made of the relationship of both age and sex with indices describing the maximum expiratory flow-volume (MEFV) curve. To determine the relationship, non-linear canonical correlation was used as realized in the computer program CANALS, a combination of ordinary canonical correlation analysis (CCA) and non-linear transformations of the variables. This method enhances the generality of the relationship to be found and has the advantage of showing the relative importance of categories or ranges within a variable with respect to that relationship. The above is exemplified by describing the relationship of age and sex with variables concerning respiratory symptoms and smoking habits. The analysis of age and sex with MEFV curve indices shows that non-linear canonical correlation analysis is an efficient tool in analysing size and shape of the MEFV curve and can be used to derive parameters concerning the whole curve.

Download Full-text

Usefulness of peak expiratory flow measurements: is it just a matter of instrument accuracy?

Thorax ◽

10.1136/thorax.58.5.375 ◽

2003 ◽

Vol 58 (5) ◽

pp. 375-376 ◽

Cited By ~ 12

Author(s):

V Brusasco

Keyword(s):

Peak Expiratory Flow ◽

Flow Measurements ◽

Expiratory Flow ◽

Instrument Accuracy

Download Full-text

Longitudinal Examination of the Shape of the Maximum Expiratory Flow‐Volume Curve in Young Adults Following SARS‐CoV‐2 Infection

The FASEB Journal ◽

10.1096/fasebj.2021.35.s1.04762 ◽

2021 ◽

Vol 35 (S1) ◽

Author(s):

Jonathon Stickford ◽

Marc Augenreich ◽

Valesha Province ◽

Nina Stute ◽

Abigail Stickford ◽

...

Keyword(s):

Young Adults ◽

Flow Volume ◽

Volume Curve ◽

Maximum Expiratory Flow ◽

Flow Volume Curve ◽

Expiratory Flow ◽

Longitudinal Examination

Download Full-text

The Shape of the Maximum Expiratory Flow Volume Curve

CHEST Journal ◽

10.1378/chest.94.4.799 ◽

1988 ◽

Vol 94 (4) ◽

pp. 799-806 ◽

Cited By ~ 25

Author(s):

Mary C. Kapp ◽

E.Neil Schachter ◽

Gerald J. Beck ◽

Lucinda R. Maunder ◽

Theodore J. Witek

Keyword(s):

Flow Volume ◽

Volume Curve ◽

Maximum Expiratory Flow ◽

Flow Volume Curve ◽

Expiratory Flow

Download Full-text

Predicting arterial oxygen tension from maximum expiratory flow volume curves in cystic fibrosis

Pediatric Pulmonology ◽

10.1002/ppul.1950060108 ◽

1989 ◽

Vol 6 (1) ◽

pp. 27-30 ◽

Cited By ~ 1

Author(s):

Arlene A. Stecenko ◽

Linda Postotnik ◽

Ronald G. Thomas

Keyword(s):

Cystic Fibrosis ◽

Oxygen Tension ◽

Arterial Oxygen Tension ◽

Arterial Oxygen ◽

Flow Volume ◽

Maximum Expiratory Flow ◽

Expiratory Flow

Download Full-text

Variability of the configuration of maximum expiratory flow-volume curves

Journal of Applied Physiology ◽

10.1152/jappl.1979.46.3.565 ◽

1979 ◽

Vol 46 (3) ◽

pp. 565-570 ◽

Cited By ~ 18

Author(s):

Y. K. Tien ◽

E. A. Elliott ◽

J. Mead

Keyword(s):

Normal Subjects ◽

Flow Limitation ◽

Residual Volume ◽

Flow Volume ◽

Maximum Difference ◽

Slope Ratio ◽

Computer Technique ◽

Volume Increment ◽

Maximum Expiratory Flow ◽

Expiratory Flow

With a computer technique variability of the configuration of maximum expiratory flow-volume (MEFV) curves was studied in terms of slope ratio, SR. SR = dV/dV divided by V/V, where V is the instantaneous flow and V is the volume increment above residual volume.) Approximately four SR-V curves, each based on three to five smoothed and averaged MEFV curves, were derived for each of 20 normal subjects (aged 23–55 yr) on a single occasion, and again at least 1 wk later. Individual curves were largely reproducible, the maximum difference in SR at most volumes being 0.3–1 U, but frequently showed substantial yet reproducible fluctuations with volume. These corresponeded to hitherto unrecognized irregularities of maximum expiratory flow that may reflect sudden changes in the location of flow limitation.

Download Full-text