conclusions pressure support ventilation, but not spontaneous breathing, induces a significant redistribution of ventilation towards the ventral region. the sensitivity of the support trigger appears to influence the distribution of ventilation only during the early phase of inspiration. background in supine position, pressure support ventilation causes a redistribution of ventilation towards t...

modeling of relationship between ventilation rate of buildings and sick building syndrome symptoms hosseinpoor s , gholamiborujeni f *, mohammadian y received: 22 aug, 2013 accepted: 23 oct , 2013 abstract background & aims: indoor air pollution with microbilal, chemical and physical pollutants lead to sick building syndrome (sbs). suitable ventilation of buildings, is one of the best methods t...

lateral and anterior displacements of mandible may cause malocclusion. the aim of this study was to determine the prevalence of these displacements in a population of 597 childrens age 12 in mashhad secondary schools. displacment of mandible was shown to be in 11.8 percent of the population (6.2 percent anterior and 5.6 percent lateral displacement).anterior displacement of mandible was diagnos...

Since the invention of mechanical ventilation systems, natural has been deemed inferior compared to active systems for buildings. The recent COVID-19 pandemic and raising awareness climate change issues have rekindled interests in as a sustainable method pollutant removal. Modelling is challenging due uncontrollable outdoor conditions. Simple models such well-mixed air model assume uniform indo...

Displacement ventilation, where cool external air enters a room through low-level vents and warmer leaves high-level vents, is characterised by vertical gradients in pressure arising from the indoor temperatures. Models usually assume that horizontal variations of temperature difference are small comparison are, therefore, unimportant. Small-scale laboratory experiments computational fluid dyna...

Natural ventilation is an important factor in the design of sustainable buildings; it has the potential to improve air quality, while providing thermal comfort at reduced energy costs. Computational fluid dynamics (CFD) simulations provide comprehensive information on the internal flow pattern and can be used as a design tool. The present work offers insight of natural ventilation in a fully fu...

Spaces with high occupancy density like classrooms are challenging to ventilate and require a lot of energy to maintain comfort. Usually, a compromise is made between low energy use and good Indoor Environmental Quality (IEQ), of which poor IEQ has consequences for occupants’ health, productivity and comfort. Alternative strategies that incorporate elevated air speeds can reduce cooling energy ...

Mechanic ventilation (MV) is an essential part of the support given to patients with respiratory failure, central nervous system injuries or undergoing postoperative care of adults, children or newborns. This support, in conjunction with frequent invasive monitoring, may cause anxiety, agitation and pain.(1) Children admitted to intensive care units (ICUs) have fear and anxiety both from the ab...

OBJECTIVE To evaluate the efficacy and safety of percutaneous tracheostomy by means of single-step dilation with fiber optic bronchoscopy assistance in critical care patients under mechanical ventilation. METHODS Between the years 2004 and 2014, 512 patients with indication of tracheostomy according to clinical criteria, were prospectively and consecutively included in our study. One-third of...