نتایج جستجو برای: jet ventilation

تعداد نتایج: 84059  

Journal: :British journal of anaesthesia 1990
M J Jones S D Mottram E S Lin G Smith

We have measured tidal (VT), entrained (Ve) and "blowback" (Vbb) volumes during high frequency jet ventilation (HFJV) through a Mallinckrodt Hi-Lo Jet tracheal tube in anaesthetized patients. The above volumes were calculated by digital integration of the appropriate regions of flow curves derived from a pneumotachograph placed between the bias flow tubing and the tracheal tube. At a driving pr...

Journal: :International journal of pediatric otorhinolaryngology 2010
Shaoqing Li Yuqi Liu Fang Tan Junliang Chen Lianhua Chen

OBJECTIVES To evaluate the efficacy of a manual jet ventilation device for bronchoscopic removal of foreign bodies in children. METHODS 360 children aged from 10 months to 12 years old undergoing rigid bronchoscopy for airway foreign body (FB) removal from February 2005 to June 2009 were included in the study. Patients were randomly divided into three groups of 120 patients per group (S, P an...

Journal: :Respiratory care 2012
Beena G Sood Zahid Latif Yimin Shen Robert J Galli Charles W Dunlap Matthew J Gelmini E Mark Haacke

BACKGROUND We have previously demonstrated aerosol delivery during conventional and high frequency oscillatory (HFOV) ventilation using magnetic resonance imaging (MRI) in piglets. There are no reports on aerosol delivery during high frequency jet ventilation (HFJV). OBJECTIVE To compare delivery of aerosolized gadopentetate dimeglumine (Gd-DTPA) in 3 neonatal ventilator circuits: convention...

2000
Scott D. Sommerfeldt

There are at least two challenges that the jet engine noise community is currently facing. One challenge is due to existing engines that are being extended to higher power ratings without increasing the passive noise control treatment area. The second challenge comes about with the increasing trend to go to ultra-high bypass engines. This increases the importance of the fan tone noise and at th...

2009
Linjun Wu Shuhua Zhu

In an Orthogonal Frequency Division Multiplexing (OFDM) systems, the Peak to Average power Ratio (PAR) is high. The clipping signal scheme is a useful and simple method to reduce the PAR. However, it introduces additional noise that degrades the systems performance. We propose an oversampling scheme to deal with the received signal in order to reduce the clipping noise by using finite impulse r...

Journal: :Canadian journal of anaesthesia = Journal canadien d'anesthesie 1997
L Magnusson F J Lang P Monnier P Ravussin

PURPOSE Laryngo-tracheal stenosis remains a major complication after prolonged intubation or tracheostomy. Surgical resection with end-to-end anastomosis carries the best long term prognosis. For the anaesthetist, however, this procedure represents a most challenging situation. METHODS Since 1993, we have used high frequency jet ventilation (HFJV) for tracheal resection. This paper describes ...

2017
Yueqin Li Li Pei Jing Li Yiqun Wang Jin Yuan Tigang Ning

We propose a photonic system for instantaneous frequency measurement (IFM) of wideband microwave signals with a tunable measurement range and resolution based on a polarization-maintaining fiber Bragg grating (PM-FBG). Firstly, in order to be insensitive to laser power fluctuation, we aim at generating two different frequency to amplitude characteristics so that we can normalize them to obtain ...

Journal: :British journal of anaesthesia 1990
E S Lin M J Jones S D Mottram B E Smith G Smith

We have studied the relationship between gas exchange and mechanical frequency response during high frequency jet ventilation (HFJV) at 0.5-5.0 Hz in anaesthetized pigs. The mechanical gain curve showed a minimal "anti-resonant" response at 0.8 Hz (f1) and a maximal "resonant" response at 5.0 Hz (f2). This finding may be explained by modelling the thorax and abdomen as a system of coupled masse...

Journal: :British journal of anaesthesia 2014
R Sütterlin R Priori A Larsson A LoMauro P Frykholm A Aliverti

BACKGROUND Superimposed high-frequency jet ventilation (SHFJV) has proved to be safe and effective in clinical practice. However, it is unclear which frequency range optimizes ventilation and gas exchange. The aim of this study was to systematically compare high-frequency jet ventilation (HFJV) with HFJV by assessing chest wall volume variations (ΔEEV(CW)) and gas exchange in relation to variab...

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