• Evaluation of natural ventilation in a modular hospital for COVID-19 patients. Displacement and transport the SARS-CoV-2 virus indoor environments. Geo-environmental aspects ventilation. The novel coronavirus, SARS-CoV-2, has potential to cause systems environments be rendered inadequate, not only workers but also people who transit through these even limited duration. Studies fields geoscien...

BACKGROUND The rapid shallow breathing index (RSBI), which is the ratio between respiratory rate (RR) and tidal volume (VT), is one of the most widely used indices to predict weaning outcome. Whereas the diaphragm plays a fundamental role in generating VT, in the case of diaphragmatic dysfunction the inspiratory accessory muscles may contribute. If this occurs during a weaning trial, delayed we...

INTRODUCTION The diaphragm plays a pivotal role in weaning and successful extubation. We hypothesized that ultrasonographic evaluation of the movements of the diaphragm by measuring liver/spleen displacement during spontaneous breathing trials is a good predictor for extubation outcome. PATIENTS AND METHODS The studied subjects were intubated patients receiving mechanical ventilation who were...

To investigate the human exhaled particle motion law under effects of thermal plume in a ventilated room, three-dimensional model typical double ward was created. The Large Eddy Simulation utilized to study different intensities on diffusion, and removal varied ventilation rates particles during displacement were simulated. results show that formed by at room temperatures has consistent distrib...

The main function of the respiratory system is gas exchange. Since many disease or injury conditions can cause biomechanical or material property changes that can alter lung function, there is a great interest in measuring regional lung function and mechanics. In this thesis, we present a technique that uses multiple respiratory-gated CT images of the lung acquired at different levels of inflat...

BACKGROUND The aim of this study was to assess the feasibility and safety issues concerning extraluminal use of the Uniblocker for one-lung ventilation (OLV) in the left thoracic surgery. METHODS Forty patients undergoing elective left thoracic surgery were included in this study, and all patients were randomly allocated to extraluminal use of Uniblocker group (E group, n = 20) or intralumina...

Total liquid ventilation can support gas exchange in animal models of lung injury. Clinical application awaits further technical improvements and performance verification. Our aim was to develop a liquid ventilator, able to deliver accurate tidal volumes, and a computerized system for measuring lung mechanics. The computer-assisted, piston-driven respirator controlled ventilatory parameters tha...

Ascites, a complicating feature of many diseases of the liver and peritoneum, commonly causes dyspnea. The mechanism of this symptom, however, is uncertain. In the present study, progressively increasing ascites was induced in anesthetized dogs, and the hypothesis was initially tested that ascites increases the impedance on the diaphragm and, so, adversely affects the lung-expanding action of t...

Thermal comfort is essential to increase the modal share of rail transport by attracting more passengers. In this study, three novel low-momentum ventilation concepts were analyzed regarding thermal railway passengers and compared a conventional setting. Using an experimental approach, objective measurements climate parameters subjective assessments from 146 test subjects in generic train compa...

Computational fluid dynamics (CFD) can be a very useful tool to help designers evaluate the indoor air quality and thermal comfort provided by HVAC systems. This paper describes how a CFD program is being used to guide the design process and optimize the ventilation system design for the world’s first indoor auto-racing facility. The facility is primarily a single space building with a floor ar...