Search Results
Results 101 - 150 of 589
1 2 3 4 5 6 7 8 9 10 >
Heidenreich Joseph W - - 2006
OBJECTIVES: Continuous chest-compression cardiopulmonary resuscitation (CCC-CPR) has been advocated as an alternative to standard CPR (STD-CPR). Studies have shown that CCC-CPR delivers substantially more chest compressions per minute and is easier to remember and perform than STD-CPR. One concern regarding CCC-CPR is that the rescuer may fatigue and be unable ...
Zubieta-Calleja G R - - 2006
Chronic Mountain Sickness (CMS) patients have repeatedly been found to hypoventilate. Low saturation in CMS is attributed to hypoventilation. Although this observation seems logical, a further understanding of the exact mechanism of hypoxia is mandatory. An exercise study using the Bruce Protocol in CMS (n = 13) compared to normals ...
Iben Sabine C - - 2006
We used a rat pup model to delineate whether mechanical ventilation of <or=4 h duration in the absence of supplemental oxygen contributes to the development of airway hyperreactivity. Eight-day-old rat pups were assigned to unventilated normoxic controls, ventilated under normoxic conditions, ventilated under hyperoxic conditions (100% O2), or unventilated hyperoxic ...
Vitacca Michele - - 2006
OBJECTIVES: To evaluate the effects of arm exercise with or without support of mechanical ventilation on breathing pattern, respiratory muscle pressure output, and ratings of dyspnea and arm discomfort in difficult-to-wean patients with COPD. DESIGN AND SETTING: Prospective, controlled, physiological study in a respiratory ICU. PATIENTS: Eight tracheostomized difficult-to-wean patients. ...
Venkataraman Shekhar T - - 2006
The indications for heliox during mechanical ventilation are lower-airway obstruction, especially with hypercarbia; need to enhance aerosol delivery to lung periphery; and need to facilitate weaning from mechanical ventilation. Certain ventilators perform relatively well with heliox and are not substantially affected by it. It is preferable to connect the heliox ...
Chiang Ling-Ling - - 2006
BACKGROUND/PURPOSE: This study was designed to investigate the effects of 6 months of nocturnal nasal positive pressure ventilation (NNPPV) on respiratory muscle function and exercise capacity in patients with chronic respiratory failure. METHODS: A prospective, randomized, controlled design was used. Twenty-nine patients with chronic respiratory failure were enrolled and allocated ...
Rathgeber Jörg - - 2006
The efficiency of HMEs decreases with increasing tidal volumes. HMEs always result in an elevation of the inspiratory and expiratory airway resistances; this should be considered especially in cases that involve spontaneous respiration. The pressure drop across HMEs should be less than 2 hPa for a flow of 60 L/min, ...
Sottiaux Thierry M - - 2006
Respiratory mucosal and lung structures and functions may be severely impaired in mechanically ventilated patients when delivered gases are not adequately conditioned. Although under- and over-humidification of respiratory gases have not been defined clearly, a safe range of temperature and humidity may be suggested. During mechanical ventilation, gas entering the ...
Harris Daniel P - - 2006
We hypothesized that long-term facilitation (LTF) of minute ventilation and peak genioglossus muscle activity manifests itself in awake healthy humans when carbon dioxide is sustained at elevated levels. Eleven subjects completed two trials. During trial 1, baseline carbon dioxide levels were maintained during and after exposure to eight 4-min episodes ...
Brown Todd B - - 2006
OBJECTIVE: Despite widespread training with CPR guidelines, CPR is often poorly performed. We explore relationships between knowledge of CPR guidelines and performance (compression rate, compression depth, compression to ventilation ratio, and ventilation volume). METHODS: Sixty professional EMTs were sampled at 26 randomly ordered EMS response stations from an urban system ...
Boots Robert J - - 2006
OBJECTIVE: To compare the incidence of ventilator-associated pneumonia (VAP) in patients ventilated in intensive care by means of circuits humidified with a hygroscopic heat-and-moisture exchanger with a bacterial viral filter (HME) or hot-water humidification with a heater wire in both inspiratory and expiratory circuit limbs (DHW) or the inspiratory limb ...
Witt Jonathan D - - 2006
The purpose of this study was to evaluate the accuracy of a respiratory inductive plethysmograph (RIP) designed for ambulatory data collection during exercise by comparison to a pneumotachograph. Healthy young males (n=10) wore an elastic body garment embedded with inductance sensors encircling the rib cage and abdomen. Breathing frequency (f(R)), ...
Putensen Christian - - 2006
PURPOSE OF REVIEW: In patients with acute respiratory distress syndrome, controlled mechanical ventilation is generally used in the initial phase to ensure adequate alveolar ventilation, arterial oxygenation, and to reduce work of breathing without causing further damage to the lungs. Although introduced as weaning techniques, partial ventilator support modes have ...
Oddo Mauro - - 2006
BACKGROUND: Acute severe asthma induces marked alterations in respiratory mechanics, characterized by a critical limitation of expiratory flow and a heterogeneous and reversible increase in airway resistance, resulting in premature airway closure, lung, and chest wall dynamic hyperinflation and high intrinsic PEEP. DISCUSSION: These abnormalities increase the work of breathing ...
Ajisaka, Ryuichi
AJISAKA, R., WATANABE, S., TOYAMA, M. and YAMAGUCHI, I., Alveolar Ventilation and Dead-space Ventilation During Exercise in Patients with Previous Myocardial Infarction. Adv. Exerc. Sports Physiol., Vol.6, No.1 pp17-23, 2000. We evaluated changes in alveolar ventilation (VA) and dead-space ventilation (VD) in 11 patients with myocardial infarction (MI) and 6 ...
Haouzi Philippe - - 2006
For over a century of creative research, many theories on the possible mechanisms controlling respiration during exercise have been developed and discussed. One of the most enduring questions is certainly related to the mechanisms that can prevent P(a)(CO(2)) rising when CO(2) production increases. As multiple systems and structures are capable ...
Greenough Anne - - 2006
During high frequency oscillation ventilation (HFOV) small tidal volumes are delivered at fast frequencies, usually between 10 and 15 Hz. Meta-analysis of randomised trials of prophylactic HFOV versus conventional ventilation have demonstrated only a modest reduction in BPD amongst survivors in the HFOV groups. Similarly, no long term advantages of ...
Toussaint Michel - - 2006
INTRODUCTION: Home mechanical ventilation is used to treat chronic alveolar hypoventilation. Maintenance protocols for home ventilation circuits (HVC) remain empirical and unproven. We have investigated (1) the cleanliness and sterility of the HVC used by home ventilated patients and (2) the efficiency of tubing cleaning and decontamination protocols recommended to ...
Lakshminrusimha Satyan - - 2006
The optimal Fi(O2) during neonatal resuscitation is a subject of controversy. The effect of exposure to high levels of inspired oxygen on pulmonary arterial (PA) contractility is not known. We studied differences in PA vasoreactivity in term lambs initially ventilated with 21% or 100% oxygen, followed by continued ventilation using ...
Fernandes M S - - 2005
The respiratory cycles of Rana and Bufo has been disputed in relation to flow patterns and to the respiratory dead-space of the buccal volume. A small tidal volume combined with a much larger buccal space motivated the "jet steam" model that predicts a coherent expired flow within the dorsal part ...
Raphael David T - - 2005
Acoustic reflectometry can be used to distinguish between breathing tube placement in an esophagus vs the trachea via characteristic area-distance profiles for both cavities. In the cardiopulmonary resuscitation setting, capnography may be useless because the patient has little or no pulmonary circulation. With the breathing tube in the esophagus, can ...
Janssens Jean-Paul - - 2005
Normal aging of the respiratory system is associated with a decrease in static elastic recoil of the lung, in respiratory muscle performance, and in compliance of the chest wall and respiratory system, resulting in increased work of breathing compared with younger subjects and a diminished respiratory reserve in cases of ...
Clarenbach Christian F - - 2005
OBJECTIVES: To evaluate the accuracy of a portable respiratory inductive plethysmograph that allows the monitoring of ventilation without airway instrumentation during exercise in unrestrained subjects. DESIGN: Validation of a novel technique by comparison to a reference standard. PARTICIPANTS: Thirty-one subjects, including 20 healthy volunteers, 6 patients with COPD, and 5 ...
Meier Jens - - 2005
BACKGROUND: Treatment of severe methemoglobinemia includes the avoidance of methemoglobin-inducing drugs, the application of methylene blue, and the administration of supplementary oxygen. However, the efficacy of the latter on oxygen transport, tissue oxygenation, and survival in the treatment of extreme methemoglobinemia is ambiguous. The objective was to assess whether using ...
Corne Stephen - - 2005
The metabolic demands of the body, including consumption of oxygen and removal of carbon dioxide, vary widely in health and disease. Ventilation must adjust to meet these demands and accommodate volitional and behavioral activities. Control of breathing depends on a complex and intricate feedback control system that integrates these automatic ...
Neumann Peter - - 2005
OBJECTIVE: In acute respiratory failure, gas exchange improves with spontaneous breathing during airway pressure release ventilation (APRV). The mechanisms for this improvement are not fully clear. We have shown that APRV with spontaneous breathing reopens nonaerated lung tissue in dorsal juxtadiaphragmatic regions. We hypothesized that spontaneous breathing during APRV may ...
Kill Clemens - - 2005
OBJECTIVE: During basic life support (BLS) by a two-rescuer-team early defibrillation and ALS procedures should be performed without interruptions of the BLS-ventilation/compression sequence. The objective of this study was to determine the impact of a ventilation/compression ratio of 5:50 versus 2:15 on the time intervals "Start BLS to first shock" ...
Calkovska Andrea - - 2005
AIM: To evaluate the efficacy of surfactant administration using the instillation technique by means of asymmetric high-frequency jet ventilation (HFJV). METHODS: Experiments were carried out on tracheotomized, anaesthetized, and paralyzed rabbits. Animals were lung-lavaged with saline and conventionally ventilated with 100% oxygen. After respiratory failure, they were ventilated for additional ...
Schmalisch Gerd - - 2005
Perfluorochemical liquid (PFC) liquids or aerosols are used for assisted ventilation, drug delivery, lung cancer hyperthermia and pulmonary imaging. The aim of this study was to investigate the effect of PFC liquid on the inertance (I) of the respiratory system in newborn piglets using partial liquid ventilation (PLV) with different ...
Wu P-C - - 2005
Our study conducted serial environmental measurements in 12 large office buildings with two different ventilation designs to obtain airborne microbial concentrations in typical office buildings, and to examine the effects of occupant density, ventilation type and air exchange efficiency on indoor microbial concentrations. Duplicate samples of airborne fungi and bacteria, ...
Spahija Jadranka - - 2005
By using diaphragm electrical activity (multiple-array esophageal electrode) as an index of respiratory drive, and allowing such activity above or below a preset target range to indicate an increased or reduced demand for ventilatory assistance (target drive ventilation), we evaluated whether the level of pressure-support ventilation can be automatically adjusted ...
Lindahl Berit - - 2005
AIM: The aim of this paper is to illuminate meanings of becoming dependent on home mechanical ventilator treatment. BACKGROUND: People suffering from chronic alveolar hypoventilation and requiring home mechanical ventilation represent a small but increasing group in society, and are some of the most vulnerable individuals with chronic disabilities. METHOD: ...
Day S K - - 2005
The gas delivery characteristics during simulated spontaneous ventilation of a non-rebreathing adaptation of the Bain circuit were examined. Tidal volumes were varied from 200 to 600 ml and respiratory rate from 8 to 20 breaths per minute obtaining characteristics for a minute volume range from 2.4 to 12 litres/minute. The ...
Thin A G - - 2004
Gas exchange during exercise in patients with cystic fibrosis (CF) is characterised by an elevated physiological deadspace to tidal volume ratio. While this has been attributed to alveolar ventilation perfusion mismatch, there are other potential causes of the high proportion of wasted ventilation, including factors relating to the volume and ...
Miller Thomas L - - 2004
Respiratory distress syndrome (RDS) in neonates is characterized by labored breathing and poor gas exchange, often requiring ventilatory support. Continuous positive airway pressure (CPAP) is a preferred intervention to support spontaneous ventilatory efforts by sustaining lung volume recruitment, while it prevents derecruitment during exhalation by maintaining end-expiratory pressure. However, CO2 ...
Brumund Kevin T - - 2004
OBJECTIVE: A major goal of maxillary antrostomy is to increase sinus ventilation. Limited data exist regarding the effect of maxillary antrostomy size on sinus ventilation. We sought to quantify the effect of uncinectomy, small antrostomy, and large antrostomy on maxillary sinus ventilation using xenon-enhanced CT in the sheep model. MATERIALS, ...
Blain Grégory - - 2005
Persistence of respiratory sinus arrhythmia (RSA) has been described in humans during intense exercise and attributed to an increase in ventilation. However, the direct influence of ventilation on RSA has never been assessed. The dynamic evolution of RSA and its links to ventilation were investigated during exercise in 14 healthy ...
Ursino Mauro - - 2004
The control of ventilation during exercise is analyzed by a mathematical model. It represents a significant improvement of our previous work, including the effect of potassium on peripheral chemoreceptors, a fast and a slow neurogenic component, and a more accurate description of blood flow control. Moreover, the feedforward contributions (potassium ...
Guazzi Marco - - 2004
Lone atrial fibrillation may be associated with daily life disability and exercise limitation. The extracardiac pathophysiology of these effects is poorly explored. In 35 subjects with lone atrial fibrillation (mean age 67 +/- 7 yr), we investigated pulmonary function, symptom-limited cardiopulmonary exercise performance, muscle ergoreflex (handgrip exercise) contribution to ventilation, ...
Manoach Seth - - 2004
BACKGROUND: We developed a large animal model of the "cannot intubate/cannot ventilate" (CNI/V) scenario to compare percutaneous transcricoid manual jet ventilation (MJV) with surgical cricothyroidotomy (SC). METHODS: Twelve sheep weighing 40-80 kg were assigned to MJV or SC groups. After sedation, intubation, and line placement, CNI/V was simulated by removing ...
de Beer Brechtje A - - 2004
It is known that insertion of ventilation tubes can cause damage to the tympanic membrane and hearing deterioration in the long-term. To investigate long-term effects of recurrent otitis media and of ventilation tube insertion, we used a study group (n = 358 subjects), with or without a history of otitis ...
Singh Yadhu N - - 2004
Previously administration of thyroxine (T4) to dystrophic hamsters improved ventilation and slowed the progression of the disease. We hypothesized that the normalization of ventilation in these animals was due to T4 improving structural and functional characteristics of the diaphragm. In the present study, contractile characteristics of the diaphragm and the ...
Yannopoulos Demetris - - 2004
BACKGROUND: The basic premise that frequent ventilations during cardiopulmonary resuscitation (CPR) are a necessity for tissue oxygenation has recently been challenged. An inspiratory impedance threshold device (ITD) recently has also been shown to increase CPR efficiency, principally by augmenting circulation with little impact on ventilation. The optimal compression to ventilation ...
Marczak M - - 2004
We investigated the ventilatory response to normobaric poikilocapnic hyperoxia in healthy subjects. The study was carried out in 26 subjects of the mean age 26 +/- 0.9 (SE) years, who breathed pure oxygen through a two-way valve for 10 min. The subjects were in the sitting position with a mouthpiece ...
Almgren Birgitta - - 2004
STUDY OBJECTIVES: To investigate the effects of endotracheal suction in volume-controlled ventilation (VCV) and pressure-controlled ventilation (PCV) with an open suction system (OSS) or a closed suction system (CSS). DESIGN: Randomized comparison. SETTING: Animal research laboratory. PATIENTS: Twelve healthy anesthetized pigs. INTERVENTIONS: The effects of endotracheal suction during VCV and ...
Lindgren Sophie - - 2004
OBJECTIVE: To compare the effectiveness of closed system suctioning (CSS) and open system suctioning (OSS) and the side effects on gas exchange and haemodynamics, during pressure-controlled ventilation (PCV) or continuous positive airway pressure (CPAP). DESIGN: Bench test and porcine lung injury model. PARTICIPANTS: Twelve bronchoalveolar saline-lavaged pigs. SETTING: Research laboratory ...
Yasuma Fumihiko - - 2004
Respiratory sinus arrhythmia (RSA) is heart rate variability in synchrony with respiration, by which the R-R interval on an ECG is shortened during inspiration and prolonged during expiration. Although RSA has been used as an index of cardiac vagal function, it is also a physiologic phenomenon reflecting respiratory-circulatory interactions universally ...
Sevi A - - 2003
The effects of ventilation on air quality, and on the welfare and production performance of dairy ewes were assessed in a 6-wk trial conducted during the winter of 2002. Thirty-six midlactation Comisana ewes were divided into three groups of 12, which were randomly balanced for parity, time of lambing, and ...
Fuschillo S - - 2003
BACKGROUND: Patients with severe kyphoscoliosis, with or without stable respiratory failure, frequently experience oxyhaemoglobin desaturation during sleep, exercise, or both. Nasal Intermittent Positive Pressure Ventilation (NIPPV) applied during sleep has been demonstrated to be able to control nocturnal desaturations and also improve diurnal respiratory failure, if this is present, in ...
Holliday Jerome E JE Medical Services, Veterans Affairs Medical Center, St. Louis MO 63106, USA. - - 2003
Previous studies have shown that relaxation biofeedback reduced the amount of time spent receiving ventilation for difficult-to-wean patients. The present study was begun to test the hypothesis that the underlying mechanism of biofeedback ventilator weaning was the reduction of neural respiratory drive (NRD). Prospective. Pulmonary Medicine division in a Veterans ...
1 2 3 4 5 6 7 8 9 10 >