نتایج جستجو برای: respiratory system

تعداد نتایج: 2405833  

ژورنال: مجله طب نظامی 2020

Coronaviruses belong to the Coronaviridae family and three SARS-CoV, MERS-CoV and SARS-CoV-2 pathogens are found in this family, all of which cause respiratory disorders in human beings. SARS-CoV-2 is a RNA virus of approximately 80-160 nm in size and genomic size of approximately 27-35 kb which causes COVID-19. Symptoms of COVID-19 include fever, dry cough, fatigue and muscle weakness, shortne...

Ali Amini Harandi Mostafa Ghanei,

Sulfur mustard is one of the major potent chemical warfare agents. It was widely used against not only military personnel but also civilian people ofIranduring the last years (1984–1988) of the Iraq–Iran war. A number of studies were performed regarding the acute and long-term consequences of sulfur mustard on respiratory system. Currently, many aspects of leading respiratory disorder that was ...

2007
M. Rozanek K. Roubik

The design of the mathematical model of the respiratory system is described in the study. The model has been designed using an electro-acoustic analogy and geometrical dimensions of the morphological models of the respiratory system. The dependence of the geometrical dimension of the airways upon the total lung impedance is studied. Geometrical dimensions of adult respiratory system and neonate...

Journal: :مجله دانشکده پزشکی دانشگاه علوم پزشکی تهران 0
فیروزه نیلی nili f

despite improvement of mechanical ventilation devices for infants, lung injury still causes morbidity and mortality in many cases. to determine the effect of high frequency oscillatory ventilation (hfov) in infants with severe respiratory failure, 10 neonates were evaluated prospectively. mean gestational age of these patients was 35 weeks and alveolar-arterial oxygen gradient (a-ado2) and the ...

Journal: :journal of research in health sciences 0
masoud neghab fatemeh amiri esmaeel soleimani seyed younus hosseini

background : the present study was undertaken to ascertain whether (or not) long term occupational exposure to low (sub-tlv levels) atmospheric concentrations of chlorine gas was associated with any significant decrements in the parameters of pulmonary function and/or  increased prevalence of respiratory symptoms. methods : in this retrospective cohort study that was performed in 2012, 54 worke...

Journal: :acta medica iranica 0
hossein kakooei department of occupational health, school of public health, tehran university of medical sciences, tehran, iran. abdollah gholami department of occupational health, school of public health, tehran university of medical sciences, tehran, iran. mehdi ghasemkhani department of occupational health, school of public health, tehran university of medical sciences, tehran, iran. mostapha hosseini department of biostatistics, school of public health, tehran university of medical sciences, tehran, iran. davoud panahi department of occupational health, school of public health, tehran university of medical sciences, tehran, iran. golamreza pouryaghoub center for research on occupational diseases, tehran university of medical sciences, tehran, iran.

dust can be produced by almost all production processes in portland cement factory. dust exposure potentially can affect respiratory function. but evidence for respiratory effect of cement dust exposure has not been conclusive. in this study we assessed effect of cement dust exposure on respiratory function in a cement production factory. a respiratory symptoms questionnaire was completed and p...

Journal: :journal of research in medical sciences 0
maasoumeh rashidi department of geography, isfahan university, isfahan, iran mohammad hossein ramesht moein zohary parinaz poursafa roya kelishadi zeinab rashidi

background: national institute of environmental health sciences (niehs) scientists shows that long-term exposure to air pollutants increases the risk of respiratory diseases such as allergies, asthma, chronic obstructive pulmonary disease, and lung cancer. children and the elderly are particularly vulnerable to the health effects of ozone, fine particles, and other airborne toxicants. air pollu...

Journal: :asia pacific journal of medical toxicology 0
mahnaz amini chronic obstructive pulmonary disease research center, school of medicine, mashhad university of medical sciences, mashhad, iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی مشهد (mashhad university of medical sciences) zohreh oghabian department of forensic medicine and clinical toxicology, kerman university of medical sciences, kerman, iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی کرمان (kerman university of medical sciences)

background: sulfur mustard (sm) as a chemical warfare agent, increases permeability of bronchial vessels and damages airway epithelium. sm exposure causes debilitating respiratory complications. this study was designed to evaluate clinical respiratory manifestations, and to compare chest x ray (cxr) and high resolution computed tomography (hrct) scan of chest in sm exposed patients with respira...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان - دانشکده مهندسی مکانیک 1387

در این تحقیق، مدل دینامیکی جذب ذرات در ریه (شش ها) بر اساس دیدگاه اویلری-اویلری تدوین شده است. شبیه سازی مدل در طول کل ریه انجام شده و مقدار جذب در هر نسل از ریه بوسیله حل عددی معادله gde بدست آمده است. همه مکانیزم های مختلف جذب ذرات منظور شده و تأثیر هر مکانیزم با توجه به اندازه ذرات تحلیل شده است. معادله gde به صورت یک بعدی و با استفاده از روش مقاطع برای بدست آوردن توزیع ذرات تنفس شده در طول ...

Journal: :acta medica iranica 0
moein m aghamohammadi a atarod l zehtab a

asthma is one of the most common chronic illnesses in childhood with an increased rate of hospitalization. in order to detemine the considerable factors for hospitalization of asthmatic children in our patients, we carried out a retrospective study of children with asthma who were admitted to children medical center affiliated to tehran university of medical sciences over a 3 year period ( 1993...

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