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 ventilation and regional specific volume change. We describe a registration-based technique for estimating local lung expansion from multiple respiratory-gated ...

Use of continuous transtracheal oxygen delivery systems combined with rhythmic chest compressions can provide excellent oxygenation and ventilation during cardiopulmonary resuscitation. However, occasional displacement of the transtracheal catheter results in life-threatening pneumomediastinal complications. We investigated using the pharyngeal lumen of a pharyngeal-tracheal lumened airway (PtL...

Mechanical factors of lung ventilation have been studied under various conditions since the works of Rohrer,’ Wirtz and Neergaard.’ Clinical application was reached with the well-known papers of Dean and Visscher3 and Otis and others.4 Because of the resistances aroused by such a displacement, the action of a series of forces or pressures is required for moving a volume of a gas to or from the ...

PURPOSE To describe the consequences of the cranial displacement of the diaphgram occurring during pneumoperitoneum (Pnp) and/or Trendelenburg (Tnd) position on respiratory mechanics. Possible addictive effects and the changes of the viscoelastic respiratory system resistance were studied, which were not extensively described before. METHODS The end-inflation occlusion method was applied on e...

Taking a typical two-person office as the research object, indoor thermal comfort of radiant cooling-displacement ventilation air-conditioning, cooling-personalized air-supply and all-air air-conditioning were simulated studied, index properties was analyzed. It found that personnel activity area with had lowest air supply temperature, PMV PPD, speed met requirements. The effect human body is s...

ventilation tube (vt) insertion is the most common otologic operations performed in children, which has great importance in recovery and prevention of hearing loss in children with eustachian tube dysfunction in critical ages of growth development. the location of the vt insertion varies in different studies; the differences are in recovery rates and sequelae of vt insertion. this study is perf...

INTRODUCTION Alterations in gas displacement in pediatric patients ventilated with the SensorMedics 3100A high-frequency oscillator are most commonly manipulated by adjusting the amplitude, frequency, and percent inspiratory time. The piston-position-and-displacement indicator is commonly centered and subsequently not adjusted. That practice may limit the clinician's ability to optimize carbon ...

Air curtain is an effective control for separating air spaces and reducing the cross-transfer of air, heat, contaminant between different zones. Studies show that displacement ventilation better indoor quality than mixed ventilation. However, may be susceptible to a phenomenon called lock-up, whereby contaminants are held in lower stratified portion space increase infection potential. This stud...