We have located links that may give you full text access.
Ratio between forced expiratory flow between 25% and 75% of vital capacity and FVC is a determinant of airway reactivity and sensitivity to methacholine.
Chest 2003 July
STUDY OBJECTIVE: The ratio between forced expiratory flow between 25% and 75% of vital capacity (FEF(25-75)) and FVC is thought to reflect dysanapsis between airway size and lung size. A low FEF(25-75)/FVC ratio is associated with airway responsiveness to methacholine in middle-aged and older men. The current study was designed to assess this relationship in both male and female subjects over a broader range of ages.
STUDY DESIGN: Data analysis of consecutive subjects who had a >or= 20% reduction in FEV(1) after
SETTING: Pulmonary function laboratory in a university-affiliated hospital.
PATIENTS: A total of 764 consecutive subjects aged 4 to 91 years (mean +/- SD age, 40.8 +/- 19.6 years). There were 223 male (29.3%) and 540 female (70.7%) subjects.
MEASUREMENTS AND RESULTS: Airway reactivity was assessed as the dose-response slope of the reduction in FEV(1) from baseline vs the cumulative dose of inhaled methacholine. The cumulative dose of methacholine causing 20% reduction in FEV(1) (PD(20)) was used as the indicator of airway sensitivity. In a linear regression model that included age, height, and percentage of predicted FEV(1), the FEF(25-75)/FVC ratio accounted for 7.6% of variability in airway reactivity (p < 0.0001, r(2) = 0.076). Subjects with higher airway sensitivity, indicated by lower PD(20), also had a lower FEF(25-75)/FVC ratio.
CONCLUSIONS: A low FEF(25-75)/FVC ratio, indicating small airway size relative to lung size, is associated with higher airway sensitivity and reactivity to methacholine in susceptible subjects.
STUDY DESIGN: Data analysis of consecutive subjects who had a >or= 20% reduction in FEV(1) after
SETTING: Pulmonary function laboratory in a university-affiliated hospital.
PATIENTS: A total of 764 consecutive subjects aged 4 to 91 years (mean +/- SD age, 40.8 +/- 19.6 years). There were 223 male (29.3%) and 540 female (70.7%) subjects.
MEASUREMENTS AND RESULTS: Airway reactivity was assessed as the dose-response slope of the reduction in FEV(1) from baseline vs the cumulative dose of inhaled methacholine. The cumulative dose of methacholine causing 20% reduction in FEV(1) (PD(20)) was used as the indicator of airway sensitivity. In a linear regression model that included age, height, and percentage of predicted FEV(1), the FEF(25-75)/FVC ratio accounted for 7.6% of variability in airway reactivity (p < 0.0001, r(2) = 0.076). Subjects with higher airway sensitivity, indicated by lower PD(20), also had a lower FEF(25-75)/FVC ratio.
CONCLUSIONS: A low FEF(25-75)/FVC ratio, indicating small airway size relative to lung size, is associated with higher airway sensitivity and reactivity to methacholine in susceptible subjects.
Full text links
Related Resources
Trending Papers
Challenges in Septic Shock: From New Hemodynamics to Blood Purification Therapies.Journal of Personalized Medicine 2024 Februrary 4
Molecular Targets of Novel Therapeutics for Diabetic Kidney Disease: A New Era of Nephroprotection.International Journal of Molecular Sciences 2024 April 4
The 'Ten Commandments' for the 2023 European Society of Cardiology guidelines for the management of endocarditis.European Heart Journal 2024 April 18
A Guide to the Use of Vasopressors and Inotropes for Patients in Shock.Journal of Intensive Care Medicine 2024 April 14
Get seemless 1-tap access through your institution/university
For the best experience, use the Read mobile app
All material on this website is protected by copyright, Copyright © 1994-2024 by WebMD LLC.
This website also contains material copyrighted by 3rd parties.
By using this service, you agree to our terms of use and privacy policy.
Your Privacy Choices
You can now claim free CME credits for this literature searchClaim now
Get seemless 1-tap access through your institution/university
For the best experience, use the Read mobile app