نتایج جستجو برای: airflow

تعداد نتایج: 8579  

Journal: :Journal of applied physiology 2001
S H Loring H T Lee J P Butler

Whereas gravity has an inspiratory effect in upright subjects, transient upward acceleration is reported to have an expiratory effect. To explore the respiratory effects of transient axial accelerations, we measured axial acceleration at the head and transrespiratory pressure or airflow in five subjects as they were dropped or lifted on a platform. For the first 100 ms, upward acceleration caus...

2016
T. Wang D. Chen P.H. Wang J. Chen J. Deng

We used a computational fluid dynamics (CFD) model to study the inspiratory airflow profiles of patients with anterior nasal cavity stenosis who underwent curative surgery, by comparing pre- and postoperative airflow characteristics. Twenty patients with severe anterior nasal cavity stenosis, including one case of bilateral stenosis, underwent computed tomography (CT) scans for CFD modelling. T...

Journal: :The European respiratory journal 1998
M J Morris R G Madgwick I Collyer F Denby D J Lane

An index obtained from tidal expiration, the ratio of time to peak tidal expiratory flow (tPTEF) to expiratory time (tE), discriminates between groups with and without airflow obstruction in infants and children and correlates with other measurements of airflow obstruction in adults. The aim of this study was to determine whether the diagnosis of airflow obstruction could be made from an analys...

2010
Akira Yamasaki Kiyoshi Hashimoto Yasuyuki Hasegawa Ryota Okazaki Miki Yamamura Tomoya Harada Shizuka Ito Soichiro Ishikawa Hiroki Takami Masanari Watanabe Tadashi Igishi Yuji Kawasaki Eiji Shimizu

BACKGROUND Chronic obstructive pulmonary disease (COPD) is one of the leading causes of death and loss of disability-adjusted life-years. However, many COPD patients are not diagnosed because of underrecognition or underdiagnosis of this disease among many patients and physicians. One possible reason is underrecognition of spirometry. In this study, we examined the prevalence of airflow limitat...

2013
Spyridon Fortis Joseph Kittah Manuel De Aguirre Maria Plataki Armand Wolff Yaw Amoateng-Adjepong Constantine A Manthous

BACKGROUND Bronchodilators are a mainstay of treatment for patients with airflow obstruction. We hypothesized that patients with obesity and no objective documentation of airflow obstruction are inappropriately treated with bronchodilators. METHODS Spirometric results and medical records of all patients with body mass index >30 kg/m2 who were referred for testing between March 2010 and August...

Journal: :Archives of otolaryngology--head & neck surgery 2000
F J Hilgers F S van Dam S Keyzers M N Koster C J van As M J Muller

OBJECTIVE To develop a nasal airflow-inducing maneuver and apply it in the olfactory rehabilitation of patients who have undergone laryngectomy. DESIGN Intervention study; before-and-after trial. SETTING National cancer center. PATIENTS Forty-four patients who underwent laryngectomy; 34 men and 10 women; mean age, 64 years (range, 42-80 years); mean time since surgery, 6 years (range, 8 m...

Journal: :Applied sciences 2021

The paper aims to investigate the airflow dynamics of electric-arc spraying (EAS) with pulsation. study is focused on dynamic structure an obstacle in form crossed electrodes at steady and pulsating air supply (with a frequency up 120 Hz). work was fulfilled using computer simulation, “shadow” photo visualization, microstructure characterization coatings formed. It found that when flows along g...

2016
Xingli Liu Weiwei Yan Yang Liu Yat Sze Choy Yi-kun Wei

The flow characteristics in the realistic human upper airway (HUA) with obstruction that resulted from pharyngeal collapse were numerically investigated. The 3D anatomically accurate HUA model was reconstructed from CT-scan images of a Chinese male patient (38 years, BMI 25.7). The computational fluid dynamics (CFD) with the large eddy simulation (LES) method was applied to simulate the airflow...

Journal: :The European respiratory journal 2004
D Bumbacea D Campbell L Nguyen D Carr P J Barnes D Robinson K F Chung

The significance of severe airflow obstruction in severe asthma is unclear. The current study determined whether severe airflow obstruction is related to inflammatory or structural changes in the airways. Patients with severe asthma from a tertiary referral clinic were divided into two groups according to their postbronchodilator forced expiratory volume in one second (FEV1): severe persistent ...

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