Results 21 to 30 of about 4,072 (126)

Artificial neural network identification of exercise expiratory flow-limitation in adults

Scientific Reports, 2023
Identification of ventilatory constraint is a key objective of clinical exercise testing. Expiratory flow-limitation (EFL) is a well-known type of ventilatory constraint. However, EFL is difficult to measure, and commercial metabolic carts do not readily
Hans Christian Haverkamp, Peter Luu, Thomas W. DeCato, Gregory Petrics   +3 more
doaj   +1 more source

Thoracic gas compression during forced expiration is greater in men than women

Physiological Reports, 2020
Intrapleural pressure during a forced vital capacity (VC) maneuver is often in excess of that required to generate maximal expiratory airflow.
Elizabeth A. Gideon, Troy J. Cross, Brooke E. Cayo, Aaron W. Betts, Dallin S. Merrell, Catherine L. Coriell, Lauren E. Hays, Joseph W. Duke   +7 more
doaj   +1 more source

Baseline spirometry parameters as predictors of airway hyperreactivity in adults with suspected asthma

BMC Pulmonary Medicine, 2021
Background Methacholine challenge tests (MCTs) are used to diagnose airway hyperresponsiveness (AHR) in patients with suspected asthma where previous diagnostic testing has been inconclusive.
Michael Peled, David Ovadya, Jennifer Cohn, Lior Seluk, Teet Pullerits, Michael J. Segel, Amir Onn   +6 more
doaj   +1 more source

Ventilatory Limitation of Exercise in Pediatric Subjects Evaluated for Exertional Dyspnea

Frontiers in Physiology, 2019
Purpose: Attribution of ventilatory limitation to exercise when the ratio of ventilation (V˙E) at peak work to maximum voluntary ventilation (MVV) exceeds 0.80 is problematic in pediatrics. Instead, expiratory flow limitation (EFL) measured by tidal flow-
Paolo T. Pianosi, Joshua R. Smith
doaj   +1 more source

Factors for the Variability of Three Acceptable Maximal Expiratory Flow–Volume Curves in Chronic Obstructive Pulmonary Disease

International Journal of COPD, 2021
Masafumi Yamamoto,1 Satoshi Konno,2 Hironi Makita,2,3 Katsuaki Nitta,4 Kaoruko Shimizu,2 Masaru Suzuki,2 Mutsumi Nishida,1 Junichi Sugita,1 Takanori Teshima,1 Masaharu Nishimura2,3 1Division of Laboratory and Transfusion Medicine, Hokkaido University ...
Yamamoto M, Konno S, Makita H, Nitta K, Shimizu K, Suzuki M, Nishida M, Sugita J, Teshima T, Nishimura M   +9 more
doaj  

Validation of new marker of fluid responsiveness based on Doppler assessment of blood flow velocity in superior vena cava in mechanically ventilated pigs

Intensive Care Medicine Experimental, 2018
Background We studied a novel approach for the evaluation and management of volemia: minimally invasive monitoring of respiratory blood flow variations in the superior vena cava (SVC). We performed an experiment with 10 crossbred (Landrace × large white)
Tomas Kovarnik, Miroslav Navratil, Jan Belohlavek, Mikulas Mlcek, Martin Chval, Zhi Chen, Stepan Jerabek, Otomar Kittnar, Ales Linhart   +8 more
doaj   +1 more source

Reference value for expiratory time constant calculated from the maximal expiratory flow-volume curve

BMC Pulmonary Medicine, 2019
Abstract Background The expiratory time constant (RCEXP), which is defined as the product of airway resistance and lung compliance, enable us to assess the mechanical properties of the respiratory system in mechanically ventilated patients.
Takamitsu Ikeda, Yasuhiro Yamauchi, Kanji Uchida, Koji Oba, Takahide Nagase, Yoshitsugu Yamada   +5 more
openaire   +3 more sources

Padrões ventilatórios na espirometria em pacientes adolescentes e adultos com fibrose cística Respiratory patterns in spirometric tests of adolescents and adults with cystic fibrosis

Jornal Brasileiro de Pneumologia, 2009
OBJETIVO: Avaliar os padrões dos distúrbios ventilatórios observados na espirometria em pacientes com fibrose cística (FC) e suas relações com a gravidade funcional e com o comportamento dos fluxos máximos expiratórios a baixos volumes.
Bruna Ziegler, Paula Maria Eidt Rovedder, Paulo de Tarso Roth Dalcin, Sérgio Saldanha Menna-Barreto   +3 more
doaj   +1 more source

Efeito do broncodilatador no tempo de apneia voluntária máxima em pacientes com distúrbios ventilatórios obstrutivos Bronchodilator effect on maximal breath-hold time in patients with obstructive lung disease

Jornal Brasileiro de Pneumologia, 2011
OBJETIVO: Identificar o papel do broncodilatador no tempo de apneia voluntária máxima em pacientes com distúrbios ventilatórios obstrutivos (DVOs). MÉTODOS: Estudo caso-controle incluindo pacientes com DVOs e grupo controle.
Raqueli Biscayno Viecili, Paulo Roberto Stefani Sanches, Denise Rossato Silva, Danton Pereira da Silva, André Frota Muller, Sergio Saldanha Menna Barreto   +5 more
doaj   +1 more source

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