Abstract:
OBJECTIVES:Regional tidal lung strain may trigger local inflammation during mechanical ventilation, particularly when additional inflammatory stimuli are present. However, it is unclear whether inflammation develops proportionally to tidal strain or only above a threshold. We aimed to 1) assess the relationship between regional tidal strain and local inflammation in vivo during the early stages of lung injury in lungs with regional aeration heterogeneity comparable to that of humans and 2) determine how this strain-inflammation relationship is affected by endotoxemia. DESIGN:Interventional animal study. SETTING:Experimental laboratory and PET facility. SUBJECTS:Eighteen 2- to 4-month-old sheep. INTERVENTIONS:Three groups of sheep (n = 6) were mechanically ventilated to the same plateau pressure (30-32 cm H2O) with high-strain (VT = 18.2 ± 6.5 mL/kg, positive end-expiratory pressure = 0), high-strain plus IV lipopolysaccharide (VT = 18.4 ± 4.2 mL/kg, positive end-expiratory pressure = 0), or low-strain plus lipopolysaccharide (VT = 8.1 ± 0.2 mL/kg, positive end-expiratory pressure = 17 ± 3 cm H2O). At baseline, we acquired respiratory-gated PET scans of inhaled NN to measure tidal strain from end-expiratory and end-inspiratory images in six regions of interest. After 3 hours of mechanical ventilation, dynamic [F]fluoro-2-deoxy-D-glucose scans were acquired to quantify metabolic activation, indicating local neutrophilic inflammation, in the same regions of interest. MEASUREMENTS AND MAIN RESULTS:Baseline regional tidal strain had a significant effect on [F]fluoro-2-deoxy-D-glucose net uptake rate Ki in high-strain lipopolysaccharide (p = 0.036) and on phosphorylation rate k3 in high-strain (p = 0.027) and high-strain lipopolysaccharide (p = 0.004). Lipopolysaccharide exposure increased the k3-tidal strain slope three-fold (p = 0.009), without significant lung edema. The low-strain lipopolysaccharide group showed lower baseline regional tidal strain (0.33 ± 0.17) than high-strain (1.21 ± 0.62; p < 0.001) or high-strain lipopolysaccharide (1.26 ± 0.44; p < 0.001) and lower k3 (p < 0.001) and Ki (p < 0.05) than high-strain lipopolysaccharide. CONCLUSIONS:Local inflammation develops proportionally to regional tidal strain during early lung injury. The regional inflammatory effect of strain is greatly amplified by IV lipopolysaccharide. Tidal strain enhances local [F]fluoro-2-deoxy-D-glucose uptake primarily by increasing the rate of intracellular [F]fluoro-2-deoxy-D-glucose phosphorylation.
journal_name
Crit Care Medjournal_title
Critical care medicineauthors
Wellman TJ,Winkler T,Costa EL,Musch G,Harris RS,Zheng H,Venegas JG,Vidal Melo MFdoi
10.1097/CCM.0000000000000346subject
Has Abstractpub_date
2014-07-01 00:00:00pages
e491-500issue
7eissn
0090-3493issn
1530-0293journal_volume
42pub_type
杂志文章abstract:OBJECTIVES:Increasing time to mechanical ventilation and high-flow nasal cannula use may be associated with mortality in coronavirus disease 2019. We examined the impact of time to intubation and use of high-flow nasal cannula on clinical outcomes in patients with coronavirus disease 2019. DESIGN:Retrospective cohort ...
journal_title:Critical care medicine
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journal_title:Critical care medicine
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doi:10.1097/00003246-199306000-00020
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abstract::Many clinical conditions are associated with an increase in abdominal pressure. While the effects on venous return have been studied in the past, little attention has been given to the effect of abdominal pressure on left-sided hemodynamic events. The effects of acute changes in abdominal pressure (Pab) on left ventri...
journal_title:Critical care medicine
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abstract:OBJECTIVE:Develop a scoring system that can assess the management of septic shock by individuals and teams. DESIGN:Retrospective review of videotapes of critical care house staff managing a standardized simulation of septic shock. SETTING:Academic medical center; videotapes were made in a recreated intensive care uni...
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doi:10.1097/01.CCM.0000256849.75799.20
更新日期:2007-03-01 00:00:00
abstract:OBJECTIVE:This survey was designed to study current practices in the monitoring and treatment of patients with severe head injury in the United States. DATA SOURCES:The collected data represent answers to telephone interviews of nurse managers, clinical specialists, and staff nurses specializing in neurotrauma care at...
journal_title:Critical care medicine
pub_type: 杂志文章,多中心研究
doi:10.1097/00003246-199503000-00023
更新日期:1995-03-01 00:00:00
abstract::A closed system device with teflon needle, sideholes, and attached stopcock was designed and evaluated for diagnosis and evacuation of neonatal pneumothoraces. Experience with this device has demonstrated specific advantages over existing needles and techniques. Since the system is airtight, diagnosis of pneumothorax ...
journal_title:Critical care medicine
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doi:10.1097/00003246-197811000-00007
更新日期:1978-11-01 00:00:00
abstract:OBJECTIVE:To compare and evaluate the potential benefit of two different anticoagulation regimens during endotoxemia in an ovine model. DESIGN:Animal prospective randomized and controlled study following preliminary dose-range study conforming with the Guide for the Care and Use of Laboratory Animals as promulgated by...
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doi:10.1097/00003246-200212000-00013
更新日期:2002-12-01 00:00:00
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journal_title:Critical care medicine
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doi:10.1097/00003246-197605000-00010
更新日期:1976-05-01 00:00:00
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doi:10.1097/CCM.0000000000000416
更新日期:2014-09-01 00:00:00
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journal_title:Critical care medicine
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doi:10.1097/00003246-199902000-00052
更新日期:1999-02-01 00:00:00
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journal_title:Critical care medicine
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doi:10.1097/CCM.0000000000001716
更新日期:2016-08-01 00:00:00
abstract:OBJECTIVE:To delineate the frequency and causes of admission to a critical care environment for patients undergoing head and neck surgery at Memorial Sloan-Kettering Cancer Center. DESIGN:Retrospective clinical investigation. SETTING:Adult intensive care unit of a tertiary referral cancer center. PATIENTS:All head a...
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doi:10.1097/00003246-199901000-00033
更新日期:1999-01-01 00:00:00
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doi:10.1097/CCM.0000000000002063
更新日期:2017-02-01 00:00:00
abstract::Quality improvement (QI) activities have been done as long as medicine has been practiced and are integral to safety and efficacy of patient care. The 20th century witnessed sophisticated advances of QI methods, with concurrent advances in research ethics. The suggestion that some interventional QI activities resemble...
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pub_type: 杂志文章,评审
doi:10.1097/01.CCM.0000054902.85329.50
更新日期:2003-03-01 00:00:00
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journal_title:Critical care medicine
pub_type: 杂志文章,评审
doi:10.1097/ccm.0b013e318186a720
更新日期:2008-10-01 00:00:00
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pub_type: 杂志文章
doi:10.1097/00003246-200201000-00035
更新日期:2002-01-01 00:00:00
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journal_title:Critical care medicine
pub_type: 杂志文章
doi:10.1097/00003246-199902000-00031
更新日期:1999-02-01 00:00:00
abstract:OBJECTIVE:To determine whether a cellular phone would interfere with the operation of mechanical ventilators. DESIGN:Laboratory study. SETTING:University medical center. SUBJECTS:Fourteen mechanical ventilators. INTERVENTIONS:We evaluated change in operation and malfunction of the mechanical ventilators. MEASUREME...
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doi:10.1097/01.ccm.0000120061.01431.db
更新日期:2004-04-01 00:00:00
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doi:10.1097/CCM.0b013e31818f2269
更新日期:2008-12-01 00:00:00
abstract::A polarographic conjunctival oxygen sensor was used to measure oxygen tension in a tissue bed supplied by the internal carotid artery. The shared vascular source of the conjunctiva and brain suggests that conjunctival PO2 monitoring may provide an index of cerebral perfusion. We studied the effects of hyperventilation...
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doi:10.1097/00003246-198601000-00003
更新日期:1986-01-01 00:00:00
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doi:10.1097/CCM.0b013e31828a6688
更新日期:2013-11-01 00:00:00
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更新日期:1990-10-01 00:00:00
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pub_type: 杂志文章,评审
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更新日期:2003-06-01 00:00:00
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pub_type: 临床试验,杂志文章
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更新日期:2002-07-01 00:00:00
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doi:10.1097/00003246-199507000-00011
更新日期:1995-07-01 00:00:00
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pub_type: 临床试验,杂志文章
doi:10.1097/00003246-199910000-00005
更新日期:1999-10-01 00:00:00
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doi:10.1097/01.CCM.0000229884.94475.DB
更新日期:2006-08-01 00:00:00
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更新日期:2021-02-01 00:00:00
abstract::Critical decreases in oxygen delivery (DO2) and mixed venous oxygen saturation (SvO2) are associated with anaerobic metabolism and, therefore, lactic acidosis. We studied 50 consecutive patients with sepsis and 50 consecutive patients with acute myocardial infarction (AMI) in whom the arterial blood lactate was greate...
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doi:10.1097/00003246-198807000-00001
更新日期:1988-07-01 00:00:00
abstract:OBJECTIVE:To analyze plasma interferon-gamma and interleukin-10 concentrations in patients with systemic meningococcal disease and patients with severe Gram-positive septic shock caused by Streptococcus pneumoniae or Staphylococcus aureus. To study the in vitro cytokine (interferon-gamma and interleukin-10) responses i...
journal_title:Critical care medicine
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更新日期:2004-02-01 00:00:00