Search Results
Results 551 - 600 of 2451
< 7 8 9 10 11 12 13 14 15 16 17 >
Tusman Gerardo - - 2004
Atelectasis in the dependent lung during one-lung ventilation (OLV) impairs arterial oxygenation and increases dead space. We studied the effect of an alveolar recruitment strategy (ARS) on gas exchange and lung efficiency during OLV by using the single-breath test of CO(2) (SBT-CO(2)). Twelve patients undergoing thoracic surgery were studied at ...
Goland Sorel - - 2004
BACKGROUND: The mechanism of dipyridamole-induced abnormal increased T1-201 lung uptake in patients without coronary artery disease is poorly understood. The purpose of this study was to evaluate the relation between dipyridamole-induced abnormal T1-201 lung uptake and left ventricular (LV) diastolic indexes using Doppler, color M-mode and Tissue Doppler modalities at ...
Frazer David G - - 2004
Experimental evidence suggests that the lung behaves as if it is composed of a large population of units which are recruited and derecruited during lung expansion and contraction. This study combines two previous models in order to estimate the probability distribution function describing lung unit opening pressures and the resulting ...
Dobson Alan - - 2004
Cardiomegaly and accompanying complications contribute to morbidity and mortality in patients on hemodialysis. Our objective is to provide a measure of heart blood volume from data collected during routine measurement of cardiac output during hemodialysis. A heart model based upon the probability of transfer between chambers during a cardiac cycle ...
Soutiere Shawn E - - 2004
Maximal lung volume or total lung capacity in experimental animals is dependent on the pressure to which the lungs are inflated. Although 25-30 cm H2O are nominally used for such inflations, mouse pressure-volume (P-V) curves show little flattening on inflation to those pressures. In the present study, we examined P-V ...
Wang T - - 2004
Arterial blood pressure (P(b)), pulmocutaneous blood flow (Q(pc)), heart rate (f(H)), and fictive ventilation (motor activity in the Vth cranial nerve, V(int)), were recorded from decerebrated, paralysed toads receiving unidirectional ventilation with experimental gas mixtures over a range of lung inflation. At the onset of spontaneous bouts of fictive ventilation, ...
Kenkel Jeffrey M - - 2004
Liposuction is a procedure that allows the surgical removal of excess adipose tissue in healthy individuals. Lipoplasty is commonly performed with few clinical side effects. However, with increased lipoaspirate volumes, complications have been reported. In addition, the abnormal appearance of fat cells in other tissues subsequent to lipoplasty has been ...
Leuchte Hanno H - - 2004
Pulmonary hypertension (PH) can develop in lung fibrosis, and contributes to increased morbidity and mortality. Noninvasive parameters in the evaluation of PH in lung disease could aid in the management of these subjects. In this study, we aimed to characterize the role of brain natriuretic peptide (BNP) and the six-minute ...
Marini J J - - 2004
Clinicians managing acute lung injury must reconcile the competing objectives of ensuring adequate oxygen delivery and minimizing the adverse effects of ventilatory support. Judging from our experimental work, microvascular stresses appear to be a potent cofactor in the development of pulmonary edema as well as in the expression of lung ...
Gudmundsson F F - - 2004
BACKGROUND: Increased intra-abdominal pressure (IAP) elevates thoracic pressure and airway pressures and reduces lung compliance in humans and laboratory animals. We studied respiratory alterations and arterial blood gas changes in pigs with IAP maintained at 20 mmHg or 30 mmHg for 3 h. METHODS: Domestic pigs of both sexes weighing ...
Luh Shi-Ping - - 2004
BACKGROUND AND PURPOSE: Reperfusion injury remains a common problem in lung transplantation. This study compared the effect of lung preservation with histidine-tryptophan-ketoglutarate (HTK), a relatively low potassium solution, and Euro-Collins (EC) solution by using a minipig in situ model of warm ischemia. METHODS: The left lungs of 5 minipigs were ...
Wang Jianpu - - 2004
BACKGROUND: The pathophysiology and treatment of chlorine gas-induced acute lung injury is poorly characterized and based on anecdotal data. This study aimed to assess the effects of aerosolized beta-2 adrenergic agonist and corticosteroid therapy on chlorine gas-induced lung injury. METHODS: Anesthetized, ventilated pigs were exposed to chlorine gas (400 parts ...
Wittwer Thorsten - - 2004
OBJECTIVE: Optimal preservation of postischemic organ function is a continuing challenge in clinical lung transplantation. Retrograde instillation of preservation solutions has theoretical advantages to achieve a homogeneous distribution in the lung due to perfusion of both the pulmonary and the bronchial circulation. Thus far, no systematic screening studies followed by ...
Bigatello L M - - 2004
Primary Acute Lung Injury (ALI) after lung resection (or "post-pneumonectomy pulmonary edema") is a rare form of acute respiratory failure characterized by dyspnea, hypoxemia, diffuse infiltrates on chest radiogram, and rapid evolution often unresponsive to therapy. ALI occurs almost exclusively following pneumonectomy, within 3 days from surgery and without a ...
Peratoner A - - 2004
BACKGROUND: Propofol is able to reduce airway resistance in lungs with previous airway constriction. The aim of this study was to evaluate the effects of propofol on respiratory mechanics in normal rats and to correlate these parameters with lung histology, to define the sites of action of propofol. METHODS: Sixteen ...
Weissmann Norbert - - 2004
Exhaled H2O2 is considered an indicator of lung inflammatory and oxidative stress. Moreover, H2O2 may be involved in signal transduction processes. It is not fully elucidated to what extent (i) H2O2 escapes from the intravascular compartment, and (ii) pulmonary H2O2 generation and nasopharyngeal H2O2 generation contribute to exhaled H2O2. We ...
van Genderingen Huibert R - - 2004
OBJECTIVE: To investigate the value of electrical impedance tomography for the assessment of regional lung mechanics during high-frequency oscillatory ventilation (HFOV). DESIGN: Prospective, interventional animal study. SETTING: University research laboratory. SUBJECTS: Eight pigs with lavage-induced lung injury. INTERVENTIONS: Electrical impedance tomography measurements were performed during a pressure-volume maneuver and during ...
Chen Jein-Wen - - 2004
A simple size-dependent compartmental model was developed to describe airborne dust exposure dynamics for the human respiratory tract (HRT) in mechanically ventilated swine buildings. Transport mechanisms of airborne dust for HRT include respiration, gravitational settling, turbulent diffusive deposition, inertial impaction, interception deposition loss, and dust clearance. The dominant deposition mechanism ...
Tirabassi Michael V - - 2004
PURPOSE: Small intercostal spaces and limited pleural space significantly limits the use of 12-mm stapling devices in pediatric thoracoscopic surgery. The goal of this study was to compare sealing of lung tissue by the 5-mm Ligasure (Valley Lab, Boulder, CO) device to a standard 12-mm Endo-GIA stapler (US Surgical, Norwalk, ...
Lin Ken C - - 2004
The extent to which inflation of one lung increases pleural pressure around the contralateral lung could affect ventilatory function, e.g., after pneumonectomy or lung transplantation. The rise in contralateral pleural pressure is limited by mediastinal stiffness and other chest wall properties. To estimate these properties, we determined an elastance of ...
Funakoshi T - - 2004
BACKGROUND: Re-expansion pulmonary oedema is a rare complication caused by rapid re-expansion of a chronically collapsed lung. Several cases of pulmonary oedema associated with one-lung ventilation (OLV) have been reported recently. Elevated levels of pro-inflammatory cytokines in pulmonary oedema fluid are suggested to play important roles in its development. Activation ...
Kotani Mariko - - 2004
OBJECTIVE: Acute lung injury induced by lung overstretch is associated with neutrophil influx, but the pathogenic role of neutrophils in overstretch-induced lung injury remains unclear. DESIGN: To assess the contribution of neutrophils, we compared the effects of noninjurious large tidal volume (Vt) ventilation on lungs in normal and neutrophil-depleted animals. ...
Andrade Cristiano Feijó - - 2004
BACKGROUND: The purpose of this study was to evaluate canine lungs obtained from non-heart-beating donors after unilateral lung transplantation subjected to partial liquid ventilation with perfluorodecalin. METHODS: Twelve donor dogs were killed and kept under mechanical ventilation for 3 hours. Heart-lung blocks were harvested after retrograde pulmonary hypothermic flush with ...
Rega Filip R - - 2004
BACKGROUND: The use of lungs from nonheart-beating donors (NHBD) might significantly alleviate the organ shortage. Extending the preharvest interval in NHBD would facilitate distant organ retrieval. We hypothesized that prolonged topical cooling inside NHBD after 60 minutes of initial warm ischemia would not affect the pulmonary graft. METHODS: Domestic pigs ...
Parker James C - - 2004
Lung injury is a broad descriptor that can be applied to conditions ranging from mild interstitial edema without cellular injury to massive and fatal destruction of the lung. This review addresses those methods that can be readily applied to rats and mice whose small size limits the techniques that can ...
Felekis Vasilios A - - 2004
From the very early stages of reduction in lung compliance, the thoracic organs may be forcibly displaced, be subject to attraction or be prevented from fully carrying out their normal movement. By evaluating these changes on a chest radiogram we may assess, at least broadly, the existence of reduced compliance ...
Suzuki So - - 2004
OBJECTIVE: Ventilator-induced lung injury is a risk in patients requiring elevated ventilatory support pressures. We hypothesized that thermal stress modulates the development of ventilator-induced lung injury. DESIGN: Experimental study. SETTING: University laboratory. SUBJECTS: Anesthetized rabbits. INTERVENTIONS: Two experimental studies were designed to determine the role of temperature as a cofactor ...
Kanmaz Turan - - 2004
PURPOSE: To investigate the acute ultrastructural changes that may occur in the contralateral nonischemic lung tissue after unilateral ischemia of a lung in a rabbit model. METHODS: The animals were divided into three main groups of eight; namely, a 2-h procedure group, a 4-h procedure group, and an 8-h procedure ...
Escolar J D - - 2004
The lung is an imperfect elastic body and for this reason dissipates energy. The energy applied to the lung in inspiration is not recovered in expiration. The property of dissipating energy receives the name of hysteresis. Lung hysteresis can be quantified because it applies to the area between the ascending ...
Quintel Michael - - 2004
Increased abdominal pressure is common in intensive care unit patients. To investigate its impact on respiration and hemodynamics we applied intraabdominal pressure (aIAP) of 0 and 20 cm H(2)O (pneumoperitoneum) in seven pigs. The whole-lung computed tomography scan and a complete set of respiratory and hemodynamics variables were recorded both ...
Laffey John G - - 2003
Hypercapnic acidosis protects against direct lung injury in in vivo and ex vivo models, however, lung injury/acute respiratory distress syndrome commonly occurs after a nonpulmonary etiology. We investigated whether therapeutic hypercapnia (TH)-deliberate elevation of carbon dioxide (CO2) tension-would protect against lung injury after splanchnic ischemia-reperfusion injury in an in vivo ...
Rega Filip R - - 2003
OBJECTIVE: To investigate the value of in situ preservation and ex vivo evaluation of lungs from a non-heart-beating donor (NHBD) prior to long-term cold storage. SUMMARY BACKGROUND DATA: The use of pulmonary grafts from NHBD might alleviate the organ shortage. However, viability testing of these grafts is mandatory to transplant ...
El-Dawlatly Abdelazeem Ali - - 2003
Endoscopic thoracic sympathectomy (ETS) is the preferred surgery for treatment of intractable palmar hyperhidrosis (PH). General anesthesia with onelung collapsed ventilation (OLCV) using single-lumen tracheal tube (SLT), is our preferred anesthetic technique for ETS. Intrapleural CO(2) insufflation (capnothorax) was used to ensure lung collapse. The current study examined the effects ...
Oelze Michael L - - 2003
A previous study [J. Acoust. Soc. Am. 111, 1102-1109 (2002)] showed that the occurrence of ultrasonically induced lung hemorrhage in rats was directly correlated to the level of lung inflation. In that study, it was hypothesized that the lung could be modeled as two components consisting of air and parenchyma ...
Escalante Teresa - - 2003
Jararhagin is the most important hemorrhagic component in the venom of the snake Bothrops jararaca, a species of medical importance in South America. It is a P-III zinc-dependent metalloproteinase comprising catalytic, disintegrin-like, and cysteine-rich domains. Jararhagin injected intravenously into mice induced rapid and prominent bleeding in the lungs, whereas other ...
Ikegami Machiko - - 2004
Preterm delivery is frequently preceded by chorioamnionitis, resulting in exposure of the fetal lung to inflammation. We hypothesized that ventilation of the antenatally inflamed lung would result in amplification of the lung injury. Therefore, we induced fetal lung inflammation with intra-amniotic endotoxin (10 mg of Escherichia coli 055:B5) 4 days ...
Yan Xiao - - 2004
To determine whether all-trans retinoic acid (RA) enhances compensatory lung growth in fully mature animals, adult male dogs (n = 4) received 2 mg x kg(-1) x day(-1) po RA 4 days/wk beginning the day after right pneumonectomy (R-PNX, 55-58% resection). Litter-matched male R-PNX controls (n = 4) received placebo. ...
Gattinoni L - - 2003
Ventilator-induced lung injury is a side-effect of mechanical ventilation. Its prevention or attenuation implies knowledge of the sequence of events that lead from mechanical stress to lung inflammation and stress at rupture. A literature review was undertaken which focused on the link between the mechanical forces in the diseased lung ...
Markstaller K - - 2003
BACKGROUND: Fast dynamic computed tomography (dCT) has been used to assess regional dynamics of lung inflation and deflation processes. The aim of this study was to relate ventilation-induced changes in lung density distribution, as measured over several respiratory cycles by dCT, to oxygenation and shunt fraction in a lavage acute ...
Laffey John G - - 2003
OBJECTIVE: Deliberate elevation of PaCO2 (therapeutic hypercapnia) protects against lung injury induced by lung reperfusion and severe lung stretch. Conversely, hypocapnic alkalosis causes lung injury and worsens lung reperfusion injury. Alterations in lung surfactant may contribute to ventilator-associated lung injury. The potential for CO2 to contribute to the pathogenesis of ...
Sedeek Khaled A - - 2003
BACKGROUND: Pressure control ventilation (PCV), high-frequency oscillation (HFO), and intratracheal pulmonary ventilation (ITPV) may all be used to provide lung protective ventilation in acute respiratory distress syndrome, but the specific approach that is optimal remains controversial. METHODS: Saline lavage was used to produce acute respiratory distress syndrome in 21 sheep ...
Rega Filip R - - 2003
BACKGROUND: The ideal preservation method during the warm ischemic period in the non-heart-beating donor (NHBD) remains unclear. In this study we compare the protective effect of ventilation vs cooling of the non-perfused pulmonary graft. METHODS: Domestic pigs (30.8 +/- 0.35 kg) were divided into 3 groups. In Group I, lungs ...
Lichtwarck-Aschoff Michael - - 2004
Part of the energy produced by the heartbeat is transferred to the lung and promotes intrapulmonary gas mixing. It is likely that this transmission in the form of local mechanical disturbances affects and reflects respiratory mechanics. The effects of the cardiogenic oscillations were studied in seven piglets during 7 h ...
Richard Jean-Christophe - - 2004
Recruitment is a dynamic physiological process that refers to the reopening of previously gasless lung units. Cumulating evidence has led to a better understanding of the rules that govern both recruitment and derecruitment during mechanical ventilation of patients with acute respiratory distress syndrome. Therefore not only the positive end-expiratory pressure, ...
Marini John J - - 2003
Experimental and clinical evidence point strongly toward the potential for microvascular stresses to influence the severity and expression of ventilator associated lung injury. Intense microvascular stresses not only influence edema but predispose to structural failure of the gas-blood barrier, possibly with adverse consequences for the lung and for extrapulmonary organs. ...
Rai Sharadindu - - 2004
Permissive hypercapnia because of reduced tidal volume is associated with improved survival in lung injury, whereas therapeutic hypercapnia-deliberate elevation of arterial Pco2-protects against in vivo reperfusion injury and injury produced by severe lung stretch. No published studies to date have examined the effects of CO2 on in vivo models of ...
Su Xiao - - 2003
OBJECTIVE: This study examined whether continuous hemofiltration favorably affects cardiopulmonary variables, lung inflammation, and lung fluid balance in a canine model of oleic acid induced acute lung injury. METHODS: Eleven pentobarbital-anesthetized dogs were randomly divided into a control (mechanical ventilation, MV) group (n=6) and a MV plus hemofiltration (HF) group ...
Dutly A E - - 2003
OBJECTIVE: Phosphodiesterases (PDEs) negatively regulate the concentrations of cAMP and/or cGMP, which act as downstream second messengers to the prostaglandins. PDE type-4 (PDE4) is selective for cAMP and is found in high concentrations in endothelial, epithelial, and different blood cells. The aim of this study was to evaluate if PDI747, ...
Heussel Claus Peter - - 2003
RATIONALE AND OBJECTIVES: Partial liquid ventilation using Perfluorcarbon (PFC) is an innovative treatment of acute respiratory distress syndrome. However, the underlying mechanisms are not totally clear. The aim was to investigate the distribution of oxygen partial pressure within the PFC-filled lung (ppO2). METHODS: Nine pigs underwent partial liquid ventilation, receiving ...
Correia-Pinto Jorge - - 2003
BACKGROUND/PURPOSE: In congenital diaphragmatic hernia (CDH), it was recently shown that early and late gestational lung underdevelopment is caused by nonmechanical and mechanical factors, respectively. Heart underdevelopment, which might predict lung hypoplasia, is commonly attributed to mechanical factors. The authors analyzed whether nonmechanical and mechanical factors affect cardiac growth and ...
< 7 8 9 10 11 12 13 14 15 16 17 >