Acute Lung InjuryWOBALINCT00961168
Work of Breathing and Mechanical Ventilation in Acute Lung Injury
A study of Acute Lung Injury, run by University of California, San Francisco.
Trial summary
The primary goal of this study is to measure changes in biological markers of inflammation in critically-ill patients with acute lung injury (ALI) or acute respiratory distress syndrome (ARDS) while they are treated with different styles of lung-protective, artificial breathing assistance. Read more about this study
- Who is it for?
- Ages 18 to 85 years
- Conditions the study is for
- Acute Lung Injury
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 0 participants
- Where
- No sites listed yet
- Study dates
- Sep 2009to Sep 2013
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 85 years
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Both medical and surgical patients undergoing mechanical ventilatory support who meet criteria for Acute Lung Injury (ALI) or Acute Respiratory Distress Syndrome (ARDS) as defined by the European-American Consensus Conference,
- Mechanical ventilation via an endotracheal or tracheotomy tube,
- PaO2/FiO2 < 300 mmHg with bilateral infiltrates on chest radiogram,
- Clinical management with lung protective ventilation (Tidal volume < 8 mL/kg).
Who cannot join
- Patients receiving "comfort care",
- High cervical spinal cord injury or other neuromuscular disease,
- Prisoners,
- Pregnancy,
- Less than 18 years of age,
- Facial fractures and coagulopathies,
- Patients placed on psychiatric hold.
About this study
Official title: Prospective Study on the Effects of Artificial Breathing Patterns on Work of Breathing in Patients With Acute Lung Injury.
The primary goal of this study is to measure changes in biological markers of inflammation in critically-ill patients with acute lung injury (ALI) or acute respiratory distress syndrome (ARDS) while they are treated with different styles of lung-protective, artificial breathing assistance.
Secondary goals are to measure the breathing effort of patients using different artificial breathing patterns from the breathing machine.
The primary hypothesis is that volume-targeted artificial patterns will produce less inflammation. The secondary hypothesis is that volume-targeted artificial patterns will increase breathing effort compared to pressure-targeted artificial patterns.
Read the detailed description
Ventilator-induced lung injury contributes to the progression of ALI/ARDS,1 and is thought to occur partly from the unequal distribution of a super-normal tidal volume to normal areas of the lung.2 Alveolar overdistension causes alveolar-capillary membrane damage,3 increased-permeability pulmonary edema4 and hyaline membrane formation.5 Therefore, it is recommended that tidal volume should be reduced to 6-7 mL/kg, and that the peak alveolar pressure, or the end-inspiratory plateau pressure (PPLAT), should be limited to < 30 cm H2O.6 The National Heart Lung and Blood Institute's ARDS Network demonstrated a 22% reduction in mortality using a "lung-protective" (low tidal volume) ventilation strategy in patients with ALI/ARDS.7 High tidal volume ventilation causes a rapid and substantial increase plasma levels of proinflammatory mediators which decrease in response to lung protective ventilation.8,9 A consequence of lung-protective ventilation is dyspnea and increased work of breathing.10 Our recent study11 on work of breathing during lung-protective ventilation found that inspiratory pleural pressure changes were extraordinarily high, averaging 15-17 cm H2O. Whereas tidal volume was well controlled during volume ventilation, in contrast, it exceeded target levels in 40% of patients during pressure control ventilation.
High tidal volume-high negative pressure ventilation causes acute lung injury in animal models.12,13 Thus ventilator-induced lung injury results from excessive stress across lung tissue created by high transpulmonary (airway-pleural).pressure.14 This suggests the possibility that despite pressure control ventilation being set with a low positive airway pressure, "occult" high tidal volume-high transpulmonary pressure ventilation still may occur.11 However, during spontaneous breathing diaphragmatic contractions cause ventilation to be distributed preferentially to dorsal:caudal aspects of the lungs.15 Therefore, high transpulmonary pressures created by large negative swings in pleural pressure theoretically may not cause regional lung over-distension and ventilator-induced lung injury if tidal ventilation is preferentially distributed to dorsocaudal lung regions. However, a study16 examining the effects of diaphragmatic breathing during Pressure Control Ventilation found that dorsocaudal distribution of tidal volume was not necessarily improved compared to passive ventilation, as the amount of tidal ventilation distributed to areas of high ventilation/perfusion was unaltered. Regardless, during a recent conference on respiratory controversies in the critical care setting, it was noted that the effects of ventilator modes such as volume control, pressure control and airway pressure-release ventilation on proinflammatory cytokine expression during lung-protective ventilation has not been studied in humans.17 Thus it is unknown whether or not differences in transpulmonary pressure and tidal volume between these modes has a direct impact on lung inflammation.
- Conditions
- Acute Lung Injury
- Being tested
- Volume Control Ventilation, Pressure Control Ventilation
- Keywords
- Mechanical Ventilation
- Medical subject headings
- Acute Lung Injury
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Volume Control VentilationOther
Also called Volume Assist/Control
Mechanical ventilation at a constant tidal volume of 6 mL/kg.
Pressure Control VentilationOther
Also called Pressure Assist/Control
Mechanical ventilation at a constant airway pressure of 25-30 cm H2O
| Study group | Role | What they receive |
|---|---|---|
| Lung-Protective Ventilation | Experimental | Lung-Protective Ventilation comparing volume vs. pressure control Receives: Other: Volume Control Ventilation; Other: Pressure Control Ventilation |
What is being measured
The primary outcome is the main question the study is designed to answer.
proinflammatory cytokine expression in plasma
Measured: 2 hours
Secondary outcomes (1)
work of breathing
Measured: 2 hours
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted18 Aug 2009 (estimated)
- Study startSep 2009
- Primary completionSep 2012 (estimated)
- Study completionSep 2013 (estimated)
Why it stopped: Budgetary restrictions
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (16)Papers the sponsor has linked to this study.
- Other trials for Acute Lung InjuryStudies of the same condition, open and under way.
- More trials run by University of California, San FranciscoThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Supportive care
- Allocation
- Randomised
- Intervention model
- Crossover
- Masking
- None (open label)
- Enrolment
- 0 participants (actual)
Sponsor and investigators
- Lead sponsor
- University of California, San Francisco
- Sponsor type
- University, hospital or other
- Investigators
- Mitchell Cohen, MD, Principal investigator, University of California, San Francisco
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00961168
- Sponsor's protocol ID
- WOBARDS
- Acronym
- WOBALI
- Status last verified
- Mar 2015
- First submitted
- 16 Aug 2009
- Last updated
- 5 Mar 2015
- Results posted
- No
- Data monitoring committee
- No
Publications
1. Dreyfus D, Sauman G. Ventilation induced injury. In: Principles and Practice of Mechanical Ventilation. Tobin M J. Editor. New York: McGraw Hill Publishers; 1994: 793-811.
Hickling KG. Ventilatory management of ARDS: can it affect the outcome? Intensive Care Med. 1990;16(4):219-26. doi: 10.1007/BF01705155.
PubMed 2193041Fu Z, Costello ML, Tsukimoto K, Prediletto R, Elliott AR, Mathieu-Costello O, West JB; New Collective Author. High lung volume increases stress failure in pulmonary capillaries. J Appl Physiol (1985). 1992 Jul;73(1):123-33. doi: 10.1152/jappl.1992.73.1.123.
PubMed 1506359Carlton DP, Cummings JJ, Scheerer RG, Poulain FR, Bland RD. Lung overexpansion increases pulmonary microvascular protein permeability in young lambs. J Appl Physiol (1985). 1990 Aug;69(2):577-83. doi: 10.1152/jappl.1990.69.2.577.
PubMed 2228868Lachmann B, Jonson B, Lindroth M, Robertson B. Modes of artificial ventilation in severe respiratory distress syndrome. Lung function and morphology in rabbits after wash-out of alveolar surfactant. Crit Care Med. 1982 Nov;10(11):724-32. doi: 10.1097/00003246-198211000-00005. No abstract available.
PubMed 67542606. Tuxen DV. Permisive hypercapnia. In: Principles and Practice of Mechanical Ventilation. Tobin M J. Editor. New York: McGraw Hill Publishers; 1994: 371-392.
Acute Respiratory Distress Syndrome Network; Brower RG, Matthay MA, Morris A, Schoenfeld D, Thompson BT, Wheeler A. Ventilation with lower tidal volumes as compared with traditional tidal volumes for acute lung injury and the acute respiratory distress syndrome. N Engl J Med. 2000 May 4;342(18):1301-8. doi: 10.1056/NEJM200005043421801.
PubMed 10793162Ranieri VM, Suter PM, Tortorella C, De Tullio R, Dayer JM, Brienza A, Bruno F, Slutsky AS. Effect of mechanical ventilation on inflammatory mediators in patients with acute respiratory distress syndrome: a randomized controlled trial. JAMA. 1999 Jul 7;282(1):54-61. doi: 10.1001/jama.282.1.54.
PubMed 10404912Stuber F, Wrigge H, Schroeder S, Wetegrove S, Zinserling J, Hoeft A, Putensen C. Kinetic and reversibility of mechanical ventilation-associated pulmonary and systemic inflammatory response in patients with acute lung injury. Intensive Care Med. 2002 Jul;28(7):834-41. doi: 10.1007/s00134-002-1321-7. Epub 2002 Jun 15.
PubMed 12122519Tuxen DV. Permissive hypercapnic ventilation. Am J Respir Crit Care Med. 1994 Sep;150(3):870-4. doi: 10.1164/ajrccm.150.3.8087364. No abstract available.
PubMed 8087364Kallet RH, Campbell AR, Dicker RA, Katz JA, Mackersie RC. Work of breathing during lung-protective ventilation in patients with acute lung injury and acute respiratory distress syndrome: a comparison between volume and pressure-regulated breathing modes. Respir Care. 2005 Dec;50(12):1623-31.
PubMed 16318643Dreyfuss D, Soler P, Basset G, Saumon G. High inflation pressure pulmonary edema. Respective effects of high airway pressure, high tidal volume, and positive end-expiratory pressure. Am Rev Respir Dis. 1988 May;137(5):1159-64. doi: 10.1164/ajrccm/137.5.1159.
PubMed 3057957Mascheroni D, Kolobow T, Fumagalli R, Moretti MP, Chen V, Buckhold D. Acute respiratory failure following pharmacologically induced hyperventilation: an experimental animal study. Intensive Care Med. 1988;15(1):8-14. doi: 10.1007/BF00255628.
PubMed 3230208Gattinoni L, Pesenti A. The concept of "baby lung". Intensive Care Med. 2005 Jun;31(6):776-84. doi: 10.1007/s00134-005-2627-z. Epub 2005 Apr 6.
PubMed 15812622Froese AB, Bryan AC. Effects of anesthesia and paralysis on diaphragmatic mechanics in man. Anesthesiology. 1974 Sep;41(3):242-55. doi: 10.1097/00000542-197409000-00006. No abstract available.
PubMed 4604401
Study at a glance
From the registry record, last updated by the sponsor on 5 Mar 2015. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Prospective Study on the Effects of Artificial Breathing Patterns on Work of Breathing in Patients With Acute Lung Injury.
- ClinicalTrials.gov ID
- NCT00961168
- Acronym / sponsor ID
- WOBALI / WOBARDS
- Conditions
- Acute Lung Injury
- Keywords
- Mechanical Ventilation
- Study type
- Interventional
- Recruitment status
- WithdrawnReason stopped: Budgetary restrictions
- Enrolment
- 0 participants (actual)
- Lead sponsor
- University of California, San FranciscoUniversity, hospital or other
- Study start
- Sep 2009
- Primary completion
- Sep 2012 (estimated)
- Study completion
- Sep 2013 (estimated)
- First posted
- 18 Aug 2009 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The primary goal of this study is to measure changes in biological markers of inflammation in critically-ill patients with acute lung injury (ALI) or acute respiratory distress syndrome (ARDS) while they are treated with different styles of lung-protective, artificial breathing assistance.
Secondary goals are to measure the breathing effort of patients using different artificial breathing patterns from the breathing machine.
The primary hypothesis is that volume-targeted artificial patterns will produce less inflammation. The secondary hypothesis is that volume-targeted artificial patterns will increase breathing effort compared to pressure-targeted artificial patterns.
Detailed description
Ventilator-induced lung injury contributes to the progression of ALI/ARDS,1 and is thought to occur partly from the unequal distribution of a super-normal tidal volume to normal areas of the lung.2 Alveolar overdistension causes alveolar-capillary membrane damage,3 increased-permeability pulmonary edema4 and hyaline membrane formation.5 Therefore, it is recommended that tidal volume should be reduced to 6-7 mL/kg, and that the peak alveolar pressure, or the end-inspiratory plateau pressure (PPLAT), should be limited to < 30 cm H2O.6 The National Heart Lung and Blood Institute's ARDS Network demonstrated a 22% reduction in mortality using a "lung-protective" (low tidal volume) ventilation strategy in patients with ALI/ARDS.7 High tidal volume ventilation causes a rapid and substantial increase plasma levels of proinflammatory mediators which decrease in response to lung protective ventilation.8,9 A consequence of lung-protective ventilation is dyspnea and increased work of breathing.10 Our recent study11 on work of breathing during lung-protective ventilation found that inspiratory pleural pressure changes were extraordinarily high, averaging 15-17 cm H2O. Whereas tidal volume was well controlled during volume ventilation, in contrast, it exceeded target levels in 40% of patients during pressure control ventilation.
High tidal volume-high negative pressure ventilation causes acute lung injury in animal models.12,13 Thus ventilator-induced lung injury results from excessive stress across lung tissue created by high transpulmonary (airway-pleural).pressure.14 This suggests the possibility that despite pressure control ventilation being set with a low positive airway pressure, "occult" high tidal volume-high transpulmonary pressure ventilation still may occur.11 However, during spontaneous breathing diaphragmatic contractions cause ventilation to be distributed preferentially to dorsal:caudal aspects of the lungs.15 Therefore, high transpulmonary pressures created by large negative swings in pleural pressure theoretically may not cause regional lung over-distension and ventilator-induced lung injury if tidal ventilation is preferentially distributed to dorsocaudal lung regions. However, a study16 examining the effects of diaphragmatic breathing during Pressure Control Ventilation found that dorsocaudal distribution of tidal volume was not necessarily improved compared to passive ventilation, as the amount of tidal ventilation distributed to areas of high ventilation/perfusion was unaltered. Regardless, during a recent conference on respiratory controversies in the critical care setting, it was noted that the effects of ventilator modes such as volume control, pressure control and airway pressure-release ventilation on proinflammatory cytokine expression during lung-protective ventilation has not been studied in humans.17 Thus it is unknown whether or not differences in transpulmonary pressure and tidal volume between these modes has a direct impact on lung inflammation.
Study design
- Primary purpose
- Supportive care
- Allocation
- Randomised
- Intervention model
- Crossover
- Masking
- None (open label)
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| Lung-Protective Ventilation | Experimental | Other: Volume Control Ventilation, Other: Pressure Control VentilationLung-Protective Ventilation comparing volume vs. pressure control |
Who may qualify
- Ages
- 18 to 85 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (4 listed)
- Both medical and surgical patients undergoing mechanical ventilatory support who meet criteria for Acute Lung Injury (ALI) or Acute Respiratory Distress Syndrome (ARDS) as defined by the European-American Consensus Conference,
- Mechanical ventilation via an endotracheal or tracheotomy tube,
- PaO2/FiO2 < 300 mmHg with bilateral infiltrates on chest radiogram,
- Clinical management with lung protective ventilation (Tidal volume < 8 mL/kg).
Key exclusion criteria (7 listed)
- Patients receiving "comfort care",
- High cervical spinal cord injury or other neuromuscular disease,
- Prisoners,
- Pregnancy,
- Less than 18 years of age,
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Volume Control VentilationAlso: Volume Assist/ControlMechanical ventilation at a constant tidal volume of 6 mL/kg. | Other | Lung-Protective Ventilation |
| Pressure Control VentilationAlso: Pressure Assist/ControlMechanical ventilation at a constant airway pressure of 25-30 cm H2O | Other | Lung-Protective Ventilation |
Primary outcome
proinflammatory cytokine expression in plasma
Time frame: 2 hours
1 secondary outcome
work of breathing
Time frame: 2 hours
Results and safety
The study was withdrawn before enrolling participants, so there are no results.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 5 Mar 2015.
- Background1. Dreyfus D, Sauman G. Ventilation induced injury. In: Principles and Practice of Mechanical Ventilation. Tobin M J. Editor. New York: McGraw Hill Publishers; 1994: 793-811.
- Background: PubMed 2193041Hickling KG. Ventilatory management of ARDS: can it affect the outcome? Intensive Care Med. 1990;16(4):219-26. doi: 10.1007/BF01705155.
- Background: PubMed 1506359Fu Z, Costello ML, Tsukimoto K, Prediletto R, Elliott AR, Mathieu-Costello O, West JB; New Collective Author. High lung volume increases stress failure in pulmonary capillaries. J Appl Physiol (1985). 1992 Jul;73(1):123-33. doi: 10.1152/jappl.1992.73.1.123.
- Background: PubMed 2228868Carlton DP, Cummings JJ, Scheerer RG, Poulain FR, Bland RD. Lung overexpansion increases pulmonary microvascular protein permeability in young lambs. J Appl Physiol (1985). 1990 Aug;69(2):577-83. doi: 10.1152/jappl.1990.69.2.577.
- Background: PubMed 6754260Lachmann B, Jonson B, Lindroth M, Robertson B. Modes of artificial ventilation in severe respiratory distress syndrome. Lung function and morphology in rabbits after wash-out of alveolar surfactant. Crit Care Med. 1982 Nov;10(11):724-32. doi: 10.1097/00003246-198211000-00005. No abstract available.
- Background6. Tuxen DV. Permisive hypercapnia. In: Principles and Practice of Mechanical Ventilation. Tobin M J. Editor. New York: McGraw Hill Publishers; 1994: 371-392.
- Background: PubMed 10793162Acute Respiratory Distress Syndrome Network; Brower RG, Matthay MA, Morris A, Schoenfeld D, Thompson BT, Wheeler A. Ventilation with lower tidal volumes as compared with traditional tidal volumes for acute lung injury and the acute respiratory distress syndrome. N Engl J Med. 2000 May 4;342(18):1301-8. doi: 10.1056/NEJM200005043421801.
- Background: PubMed 10404912Ranieri VM, Suter PM, Tortorella C, De Tullio R, Dayer JM, Brienza A, Bruno F, Slutsky AS. Effect of mechanical ventilation on inflammatory mediators in patients with acute respiratory distress syndrome: a randomized controlled trial. JAMA. 1999 Jul 7;282(1):54-61. doi: 10.1001/jama.282.1.54.
- Background: PubMed 12122519Stuber F, Wrigge H, Schroeder S, Wetegrove S, Zinserling J, Hoeft A, Putensen C. Kinetic and reversibility of mechanical ventilation-associated pulmonary and systemic inflammatory response in patients with acute lung injury. Intensive Care Med. 2002 Jul;28(7):834-41. doi: 10.1007/s00134-002-1321-7. Epub 2002 Jun 15.
- Background: PubMed 8087364Tuxen DV. Permissive hypercapnic ventilation. Am J Respir Crit Care Med. 1994 Sep;150(3):870-4. doi: 10.1164/ajrccm.150.3.8087364. No abstract available.
- Background: PubMed 16318643Kallet RH, Campbell AR, Dicker RA, Katz JA, Mackersie RC. Work of breathing during lung-protective ventilation in patients with acute lung injury and acute respiratory distress syndrome: a comparison between volume and pressure-regulated breathing modes. Respir Care. 2005 Dec;50(12):1623-31.
- Background: PubMed 3057957Dreyfuss D, Soler P, Basset G, Saumon G. High inflation pressure pulmonary edema. Respective effects of high airway pressure, high tidal volume, and positive end-expiratory pressure. Am Rev Respir Dis. 1988 May;137(5):1159-64. doi: 10.1164/ajrccm/137.5.1159.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Mitchell Cohen, MD principal investigator
University of California, San Francisco
Questions about this trial
What is this clinical trial studying?
A study of Acute Lung Injury, run by University of California, San Francisco.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 4 inclusion and 7 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: withdrawn, as of the sponsor's last update on 5 Mar 2015. Status can change between updates, so confirm with the study contact before making plans.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study was withdrawn before enrolling participants, so there are no results.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
proinflammatory cytokine expression in plasma (time frame: 2 hours). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT00961168, which also lists 16 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 5 Mar 2015.