Results 31 to 40 of about 12,006,331 (115)

The Concavity of the Maximal Expiratory Flow–Volume Curve Reflects the Extent of Emphysema in Obstructive Lung Diseases [PDF]

Scientific Reports, 2019
AbstractA concave-shaped maximal expiratory flow-volume (MEFV) curve is a spirometric feature in chronic obstructive pulmonary disease (COPD). The MEFV curve is characterized by an increase in the Obstructive Index, which is defined as a ratio of forced vital capacity to the volume-difference between two points of half of the peak expiratory flow on ...
Fumi Mochizuki, Hiroaki Iijima, Azusa Watanabe, Naoya Tanabe, Susumu Sato, Masanari Shiigai, Keiji Fujiwara, Takafumi Shimada, Hiroichi Ishikawa, Jun Kanazawa, Yohei Yatagai, Hironori Masuko, Tohru Sakamoto, Shigeo Muro, Nobuyuki Hizawa   +14 more
openaire   +2 more sources

Analysis of Maximal Expiratory Flow-Volume Curves. Visual Evaluation and Quantitative Evaluation.

Nippon Eiseigaku Zasshi (Japanese Journal of Hygiene), 1991
Maximal expiratory flow-volume (MEFV) curves have been utilized in the diagnosis of chronic obstructive lung diseases, in the survey of air pollution, and in studies of respiratory functions in school children. Indices for the lower lung volumes of MEFV curves have been used in statistical analysis or individual evaluation because of their effort ...
Meguro, Tadamichi, Ogata, Masana
openaire   +4 more sources

Assessing the repeatability of expiratory flow limitation during incremental exercise in healthy adults

Physiological Reports
We sought to determine the repeatability of EFL in healthy adults during incremental cycle exercise. We hypothesized that the repeatability of EFL would be “strong” when assessed as a binary variable (i.e., absent or present) but “poor” when assessed as ...
Jack R. Dunsford, Jasvir K. Dhaliwal, Gracie O. Grift, Robert Pryce, Paolo B. Dominelli, Yannick Molgat‐Seon   +5 more
doaj   +1 more source

Variability of the configuration of maximum expiratory flow-volume curves

, 1979
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
J. Mead, Y. K. Tien, E. A. Elliott
core   +1 more source

Dyspnea During Night-Time and at Early Morning in Patients with Stable COPD is Associated with Supine Tidal Expiratory Flow Limitation

International Journal of COPD, 2020
Silvia Uccelli,1 Laura Pini,1 Damiano Bottone,1 Piera Ranieri,2 Nicla Orzes,1 Claudio Tantucci1 1Respiratory Medicine Unit, Department of Experimental and Clinical Sciences, University of Brescia, Brescia, Italy; 2Department of Internal Medicine and ...
Uccelli S, Pini L, Bottone D, Ranieri P, Orzes N, Tantucci C   +5 more
doaj  

Lung volumes and expiratory flow limitation during exercise in interstitial lung disease

, 1994
Lung volumes were measured at rest and during exercise by an open-circuit N2-washout technique in patients with interstitial lung disease (ILD). Exercise tidal flow-volume (F-V) curves were also compared with maximal F-V curves to investigate whether ...
R. E. Clemens, G. Sridhar, C. G. Gallagher, T. A. Zintel, D. D. Marciniuk   +4 more
core   +1 more source

Physiological and morphological determinants of maximal expiratory flow in chronic obstructive lung disease [PDF]

, 1996
Maximal expiratory flow in chronic obstructive pulmonary disease (COPD) could be reduced by three different mechanisms; loss of lung elastic recoil, decreased airway conductance upstream of flow-limiting segments; and ...
Hop, W.C.J. (Wim), Jongste, J.C. (Johan) de, Pare, P.D., Tiddens, H.A.W.M. (Harm), Coxson, H.O. (Harvey), Bogaard, J.M. (Jan)   +5 more
core  

Effects of airway tone and volume history on maximal expiratory flow in asthma

, 1987
We assessed the difference between isovolumic maximal expiratory flows (Vmax) using maneuvers begun at mid-lung volumes, so-called partial expiratory flow-volume curves (P), vs.
R. H. Ingram, B. M. Pichurko
core   +1 more source

Dose-response curve to salbutamol during acute and chronic treatment with formoterol in COPD

International Journal of COPD, 2011
Giuseppe Emanuele La Piana¹, Luciano Corda², Enrica Bertella¹, Luigi Taranto Montemurro¹, Laura Pini¹, Claudio Tantucci¹¹Cattedra di Malattie dell'Apparato Respiratorio, Universit&
La Piana GE, Corda L, Bertella E, Taranto Montemurro L, Pini L, Tantucci C   +5 more
doaj  

Effect of volume history on successive partial expiratory flow-volume maneuvers

, 1976
In normal subjects, the second of two successive partial expiratory flow-volume (PEFV 2) curves often had higher isovolume maximal expiratory flow rates (Vmax) than the first (PEFV 1) (mean increase 30.2 +/- 13%).
E. R. McFadden, R. Brown, J. Mead, J. J. Wellman, R. H. Ingram   +4 more
core   +1 more source