Abstract:
:The effects of conventional mechanical ventilation (CMV) and high-frequency oscillatory ventilation (HFO) on intraalveolar expression of the tumor necrosis factor-alpha (TNF-alpha) gene were studied in surfactant-depleted rabbits. After lung lavage with saline, 13 rabbits were administered either CMV (n = 6) or HFO (n = 7) for 1 h at an FiO2 of 1.0 and a mean airway pressure of 13 cm H2O. Lung lavage was then repeated. The rabbits' RNA was extracted from the lavage cells, and mRNA for TNF-alpha was quantitated by reverse-transcription polymerase chain reaction using glyceraldehyde 3-phosphate dehydrogenase (GAPDH) as an internal standard. At 1 h of ventilation, PaO2 was slightly lower with CMV than HFO, while lavage cell counts and cytology were similar between the two groups. The ratio of TNF-alpha mRNA to GAPDH mRNA increased with CMV (control, 0.48 +/- 0.04 [SE] versus 1 h, 1.02 +/- 0.14, p < 0.01) but did not change with HFO (0.55 +/- 0.07 versus 0.73 +/- 0.09). In a separate series of experiments, ten surfactant-depleted rabbits continued to be ventilated for 4 h either by CMV (n = 5) or HFO (n = 5). Conventional mechanical ventilation resulted in a progressive hypoxemia, decreased lung compliance, increased number of neutrophils in lung lavage fluid, and substantial morphological changes including hyaline membrane formation and neutrophil accumulation, whereas HFO was associated with minimal changes in such physiological and pathological abnormalities. These results suggest that activation of alveolar macrophages and production of proinflammatory cytokines may play a pivotal role in the early stage of ventilator-induced lung injury, and that ventilator mode (CMV or HFO) substantially modulates macrophage activation and hence the degree of lung injury.
journal_name
Am J Respir Crit Care Medauthors
Takata M,Abe J,Tanaka H,Kitano Y,Doi S,Kohsaka T,Miyasaka Kdoi
10.1164/ajrccm.156.1.9607072subject
Has Abstractpub_date
1997-07-01 00:00:00pages
272-9issue
1eissn
1073-449Xissn
1535-4970journal_volume
156pub_type
杂志文章abstract::We reasoned that a prospective assessment of glucocorticoid withdrawal in subjects with asthma would provide insight into the basis for flares of the disease. We therefore enrolled 25 subjects with moderate persistent asthma and treated them for 30 days with inhaled fluticasone propionate (1,760 microg/day) followed b...
journal_title:American journal of respiratory and critical care medicine
pub_type: 杂志文章
doi:10.1164/rccm.200208-960OC
更新日期:2004-04-01 00:00:00
abstract::Retrospective studies have suggested that combination antibiotic therapy for severe bacteremic pneumococcal pneumonia may reduce mortality. We assessed this issue in a prospective, multicenter, international observational study of 844 adult patients with bacteremia due to Streptococcus pneumoniae. The effect of combin...
journal_title:American journal of respiratory and critical care medicine
pub_type: 临床试验,杂志文章,多中心研究
doi:10.1164/rccm.200311-1578OC
更新日期:2004-08-15 00:00:00
abstract::The incidence of mutations of the cystic fibrosis transmembrane conductance regulator (CFTR) gene in children with intermediate sweat chloride levels is unknown. The results of 2,349 sweat tests performed at two Belgian university hospitals were reviewed. Intermediate chloride concentrations were observed in 98 subjec...
journal_title:American journal of respiratory and critical care medicine
pub_type: 杂志文章,多中心研究
doi:10.1164/ajrccm.165.6.2104073
更新日期:2002-03-15 00:00:00
abstract:RATIONALE:There are few follow-up studies on long-term cardiopulmonary function after pulmonary endarterectomy (PEA), the operation of choice for chronic thromboembolic pulmonary hypertension (CTEPH). OBJECTIVES:To prospectively evaluate long-term outcome of patients with CTEPH treated with PEA. METHODS:Between 1994 ...
journal_title:American journal of respiratory and critical care medicine
pub_type: 杂志文章
doi:10.1164/rccm.200801-101OC
更新日期:2008-08-15 00:00:00
abstract::Dysfunction of the muscles of ambulation contributes to exercise intolerance in chronic obstructive pulmonary disease (COPD). Men with COPD have high prevalence of low testosterone levels, which may contribute to muscle weakness. We determined effects of testosterone supplementation (100 mg of testosterone enanthate i...
journal_title:American journal of respiratory and critical care medicine
pub_type: 临床试验,杂志文章,随机对照试验
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更新日期:2004-10-15 00:00:00
abstract::A noninvasive means of detecting airway secretions in ventilator-dependent patients is desirable because endotracheal suctioning can result in life-threatening complications. In a patient who had copious secretions, we observed a sawtooth pattern on his flow-volume curve that disappeared after suctioning. Accordingly,...
journal_title:American journal of respiratory and critical care medicine
pub_type: 杂志文章
doi:10.1164/ajrccm.150.3.8087350
更新日期:1994-09-01 00:00:00
abstract:RATIONALE:Recent findings have demonstrated that muscarinic M(3) receptor stimulation enhances airway smooth muscle proliferation to peptide growth factors in vitro. Because both peptide growth factor expression and acetylcholine release are known to be augmented in allergic airway inflammation, it is possible that ant...
journal_title:American journal of respiratory and critical care medicine
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更新日期:2005-05-15 00:00:00
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journal_title:American journal of respiratory and critical care medicine
pub_type: 杂志文章
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更新日期:2005-10-15 00:00:00
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journal_title:American journal of respiratory and critical care medicine
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更新日期:2012-08-01 00:00:00
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journal_title:American journal of respiratory and critical care medicine
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doi:10.1164/ajrccm.162.1.9908071
更新日期:2000-07-01 00:00:00
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journal_title:American journal of respiratory and critical care medicine
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doi:10.1164/ajrccm.164.4.2011089
更新日期:2001-08-15 00:00:00
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journal_title:American journal of respiratory and critical care medicine
pub_type: 杂志文章
doi:10.1164/rccm.200609-1347OC
更新日期:2007-11-15 00:00:00
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journal_title:American journal of respiratory and critical care medicine
pub_type: 杂志文章
doi:10.1164/ajrccm.162.5.2003057
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journal_title:American journal of respiratory and critical care medicine
pub_type: 杂志文章
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更新日期:1998-06-01 00:00:00
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journal_title:American journal of respiratory and critical care medicine
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更新日期:2006-03-01 00:00:00
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journal_title:American journal of respiratory and critical care medicine
pub_type: 杂志文章
doi:10.1164/rccm.201502-0314CP
更新日期:2016-01-01 00:00:00
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journal_title:American journal of respiratory and critical care medicine
pub_type: 杂志文章
doi:10.1164/ajrccm.152.3.7663790
更新日期:1995-09-01 00:00:00
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更新日期:2011-05-15 00:00:00
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journal_title:American journal of respiratory and critical care medicine
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journal_title:American journal of respiratory and critical care medicine
pub_type: 杂志文章
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更新日期:2003-12-01 00:00:00
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journal_title:American journal of respiratory and critical care medicine
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更新日期:2012-01-01 00:00:00
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journal_title:American journal of respiratory and critical care medicine
pub_type: 杂志文章,评审
doi:10.1164/ajrccm.149.6.7911710
更新日期:1994-06-01 00:00:00
abstract:RATIONALE:Reactivation tuberculosis (TB) occurs as a result of reactivation of latent TB infection (LTBI), and was reported to occur in the United States at a rate of 0.10 to 0.16 cases per 100 person-years in the 1950s; it has not been measured since. OBJECTIVES:To calculate the rate of reactivation TB in a U.S. comm...
journal_title:American journal of respiratory and critical care medicine
pub_type: 杂志文章
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更新日期:2010-08-01 00:00:00
abstract:RATIONALE:Obesity, especially truncal obesity, is a risk factor for asthma incidence, prevalence, and severity. Chitinase 3-like-1 (Chi3l1) is an evolutionarily conserved moiety that plays a critical role in antipathogen and Th2 responses. However, the mechanisms that underlie the association between asthma and obesity...
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更新日期:2015-04-01 00:00:00
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journal_title:American journal of respiratory and critical care medicine
pub_type: 杂志文章
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更新日期:2010-10-15 00:00:00
abstract::Arousal from sleep produces transient increases in systemic blood pressure, leading to the suggestion that repeated arousals are associated with a sustained increase in daytime blood pressure. Using data from the Wisconsin Sleep Cohort Study, a population-based study, we tested the hypothesis that sleep fragmentation ...
journal_title:American journal of respiratory and critical care medicine
pub_type: 杂志文章
doi:10.1164/ajrccm.162.6.9904008
更新日期:2000-12-01 00:00:00
abstract:RATIONALE:Conversion from a negative to positive QuantiFERON-TB test is indicative of Mycobacterium tuberculosis (Mtb) infection, which predisposes individuals to tuberculosis disease. Interpretation of serial tests is confounded by immunological and technical variability. OBJECTIVES:To improve the consistency of seri...
journal_title:American journal of respiratory and critical care medicine
pub_type: 杂志文章
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更新日期:2017-09-01 00:00:00
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journal_title:American journal of respiratory and critical care medicine
pub_type: 杂志文章,随机对照试验
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更新日期:2014-06-15 00:00:00