The lattice Boltzmann method (LBM) and large-eddy simulation (LES) are combined with a scalar subgrid-scale model to simulate the indoor air velocity field harmful gas dispersion. LBM-LES is validated by comparing its results published experimental numerical results. Taking simplified chemical building as scenario, relative ventilation efficiency evaluated based on maximum concentration, config...

background: application noninvasive ventilation in the patients with exacerbation of chronic obstructive pulmonary disease (copd) reduced mortality. this case-control study was designed to compare efficiency and outcome of non-invasive (niv) versus invasive positive pressure ventilation (ippv) in respiratory failure due to copd methods: the patients were assigned to niv or ippv intermittantly.t...

conclusions according to the results of our study, neck collar fixation has no effect on ventilation in multiple trauma patients. results this study involved 163 multiple trauma patients. of these, 65% were male. the mean of end tidal carbon dioxide (etco2) of the patients without neck collars was 34.62 ± 4.46 and the mean etco2 of the patients with neck collars was 34.21 ± 2.31. there was no s...

background: endotracheal or tracheostomy tube in mechanically ventilated patients disturb verbal communication with others. therefore, patients are frustrated of requesting for their needs or problems related to artificial breathing. therefore investigating self-experiences of these patients can be applied in providing them with a better care by clinical personnel. methods: this is a qualitativ...

variability of tidal volume and respiratory rate in normally breathing man has long been demonstrated [1]. however because of lack of knowledge and technology primary ventilators could only deliver a fixed tidal volume in a fixed rate the so called volume controlled ventilation (vcv). vcv was volume preset time triggered and cycled and there was no synchronization with patient’s breaths. at tha...

abstract background: different modes of mechanical ventilation are used for respiratory support after coronary artery bypass graft (cabg). this study aimed to compare the effect(s) of using adaptive support ventilation (asv) and synchronized intermittent mandatory ventilation (simv) on the length of mechanical ventilation (intubation duration) and hospital stay after coronary artery bypass graf...

In recent years, displacement ventilation system has received much attention in terms of infectious disease control, due to the epidemic COVID-19 infections. Plume from occupants and other heat sources is a very important factor for because it determines height contaminant stratification. Therefore, this paper aims at effect distance between on distribution temperature, concentration plume CFD ...