Forced expiratory volume in one second: why dichotomise?
نویسندگان
چکیده
منابع مشابه
Forced expiratory volume in one second: why dichotomise?
Numerous epidemiological surveys have tried to evaluate the effects of exposures relevant to pulmonary disease.' A number of studies have analysed forced expiratory volume in one second (FEVI) using linear regression analysis, thus enabling adjustment for age, height, and sex as well as potential confounding variables. Within the last few years, studies analysing dichotomous FEV, variables with...
متن کاملEffort and the forced expiratory volume in one second (FEV).
1. The relationship between volumes expired and the maximum intrathoracic pressures developed within the first second of expiration was examined in a group of healthy subjects and patients with airways obstruction who exhaled with varying degrees of effort. 2. The body plethysmographic method was used to ensure that expirations started from total lung capacity. 3. Three different types of volum...
متن کاملSources of variation in forced expiratory volume in one second and forced vital capacity.
Published prediction equations for lung function differ considerably, but the components of population variation responsible for the differences are unknown. Data were analysed for 6,323 never-smoking adults who did not report wheeze or asthma, from 42 centres participating in the European Community Respiratory Health Survey. Means and components of variance were estimated for males and females...
متن کاملUncertainties in the expected value for forced expiratory volume in one second after surgery.
The purpose of this study is to understand better the reasons for the frequent unreliability of the expected value for the forced expiratory volume in one second (FEV1) in predicting surgical results after pneumonectomy. Measurement of FEV1 was performed in 159 patients before and after removal of one lung. Only 41 of the postoperative values for FEV1 differed from predicted values by less than...
متن کاملThe changes in airways structure associated with reduced forced expiratory volume in one second.
We compared the structure of the membranous and respiratory bronchioles of resected lungs from 111 patients with a normal predicted forced expiratory volume in one second (FEV1) to the structure of these airways from 45 patients with an FEV1 reduced below the 95% confidence limits for height and age. Membranous and respiratory bronchioles of less than 2 mm in internal diameter were counted and ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Occupational and Environmental Medicine
سال: 1992
ISSN: 1351-0711
DOI: 10.1136/oem.49.6.445