Biomarkers of Lung Injury With Low Tidal Volume Ventilation Compared With Airway Pressure Release Ventilation

Boston Medical Center (BMC)

Status: Terminated

Conditions: Adult Respiratory Distress Syndrome; Acute Lung Injury

Treatments: Other: APRV; Other: low-tidal-volume ventilation

Study type: Interventional

Funder types: Other

Identifiers

NCT01038531

H-28944

Details and patient eligibility

About

Acute lung injury (ALI) and the acute respiratory distress syndrome (ARDS) represent a spectrum of clinical syndromes of rapid respiratory system deterioration that are associated with both pulmonary and systemic illness. These syndromes are associated with 30-40% mortality with our current standard of care and are responsible for approximately 75,000 deaths in the US yearly. Current evidence-based care of ALI consists of a strategy of mechanical ventilation utilizing low lung volumes (ARDSNet ventilation) intended to limit further stretch-induced lung injury exacerbated by the ventilator. However, this strategy has been shown to be associated with increased lung injury in a subset of patients and still is associated with about a 30% mortality rate. Airway pressure release ventilation (APRV) is a different, non-experimental strategy of mechanical ventilation currently in routine clinical use. APRV is a pressure-cycled ventilator mode that allows a patient a greater degree of autonomy in controlling his or her breathing pattern than ARDSNet ventilation. Use of APRV has been associated with better oxygenation, less sedative usage, and less ventilator-associated pneumonia in small studies compared with other ventilator modes. However, debate exists over whether APRV might result in decreased or increased ventilator-associated lung injury when compared with ARDSNet ventilation. We intend to implement a randomized, cross over study looking at biomarkers of lung injury in patients with acute lung injury during ventilation with APRV and using the ARDSNet protocol. Our hypothesis is that airway pressure release ventilation is associated with lower levels of lung injury biomarkers than ARDSNet ventilation.

Full description

Acute lung injury (ALI) and the acute respiratory distress syndrome (ARDS) represent a spectrum of clinical syndromes of rapid respiratory system deterioration that are associated with both pulmonary and systemic illness. These syndromes are associated with 30-40% mortality with our current standard of care and are responsible for approximately 75,000 deaths in the US yearly. The current evidence-based care consists of a strategy of mechanical ventilation utilizing low lung volumes (ARDSNet ventilation) intended to limit further lung injury from overstretch of the lung induced by the ventilator. However, this strategy has been shown to be associated with continued lung injury in some studies and still is associated with about a 30% mortality rate. Airway pressure release ventilation (APRV) is a different, nonexperimental strategy of mechanical ventilation currently in routine clinical use. APRV allows a patient a greater degree of autonomy in controlling his/her breathing while achieving a higher mean airway pressure (at similar plateau pressures) than that typically achieved with ARDSNet. APRV has been associated with less ventilator-associated pneumonia, better oxygenation, and less sedative usage in small studies when compared with other methods of ventilation. However, debate exists over net effects of APRV with regard to ventilator-associated lung injury. Additionally, we recently completed a study showing that APRV was associated with lower ventilator associated pneumonia (VAP) rates, but this benefit did not appear to be mediated by sedation differences. We hypothesized that the VAP benefits might be mediated by greater lung recruitment and possibly less ventilator-induced lung injury with APRV. We propose a randomized, crossover study looking at biomarkers of lung injury in patients with acute lung injury ventilated with APRV and ARDSNet. Our hypothesis is that airway pressure release ventilation is associated with lower levels of lung injury biomarkers than ARDSNet ventilation.

Enrollment: 3 patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Age > or equal to 18.
• On mechanical ventilation using a volume-controlled mode.
• Admitted to Boston Medical Center Surgical, Medical, or Coronary Intensive Care Unit.
• Meets American-European Consensus Criteria for Acute Lung Injury (ALI) or Acute Respiratory Distress Syndrome.
• Required mechanical ventilator for less than 14 days.
• Met ARDS or ALI criteria for less than 7 days prior to enrollment.
• Assent of primary care team

Exclusion criteria

• Do not resuscitate order.
• Increased intracranial pressure.
• Pregnancy (urine pregnancy test for all women of child-bearing age).
• Planned transport out of ICU during planned study protocol.
• Coagulopathy (INR>2.0 or PTT >50).
• Severe thrombocytopenia (platelets <20,000).
• History of obstructive lung disease (asthma and/or COPD).

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Crossover Assignment

Masking: None (Open label)

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3 participants in 2 patient groups

low-tidal-volume ventilation

Active Comparator group

Description:

Goal tidal volume is 6 cc/kg ideal body weight.

Treatment:

Other: low-tidal-volume ventilation

APRV

Experimental group

Description:

APRV allows spontaneous breathing.

Treatment:

Other: APRV