ASOP: Assessing Ventilator Safety in Patients on Pressure-Support Ventilation
ASOP is a prospective cohort study comparing three methods for assessing risk of self-induced lung injury in patients with acute respiratory failure being managed with pressure-support ventilation. We will describe the relationship between three different assessment methods for risk of self-induced lung injury and compare them to a gold standard measurement.
|Condition or Disease||Intervention/Treatment||Phase|
Ventilator-induced lung injury (VILI) is known to cause significant morbidity and mortality in patients with acute respiratory failure. Most studies on VILI have involved the effects of inappropriate (often excessive) mechanical ventilator settings. More recently, it has been noted that similar lung damage can be caused by large, patient generated, uncontrolled tidal volumes and driving pressures, which has been termed "self-induced lung injury," or SILI.
Pressure-support ventilation (PSV) is a common mechanical ventilation mode often used in patients with active inspiratory efforts to help reduce patient inspiratory work and improve comfort. PSV effectively allows spontaneously breathing patients to determine their breath flow-rate and breath duration, eliminating flow and cycle dyssynchrony. However, pressure support ventilation does not allow for physicians to control tidal volume or driving pressure. The risk of SILI may thus be increased with PSV.
Several different methods have been proposed to address these challenges. However, to date none of these methods have been compared to assess for concordance in their ability to indicate an increased risk of self-induced lung injury. ASOP is a prospective cohort study comparing three methods for assessing risk of self-induced lung injury in patients with acute respiratory failure being managed with pressure-support ventilation.
Arms and Interventions
|Experimental: Acute Respiratory Failure
Patients with acute respiratory failure managed with pressure-support ventilation.
Device: Viasys Avea Ventilator
Measuring dynamic airway driving pressure and static airway driving pressure during pressure support breath, and static airway driving pressure during a volume control breath. Measuring airway occlusion pressure during pressure support breath.
Device: Philips Respironics NM3 device
Measuring static airway driving pressure during pressure support breath
Device: Servo U ventilator
Measuring static airway driving pressure and p0.1 during pressure support breath.
Device: Vyaire SmartCath adult nasogastric tube with Esophageal balloon
Measuring static and dynamic esophageal driving pressure during pressure support breath, and esophogeal pressure change during airway occlusion maneuver.
Primary Outcome Measures
- Respiratory System Driving Pressure measure by Servo Ventilator (DPrs-servo) [Study day 1]
Driving pressure in centimeters of water measured with inspiratory hold on Servo Ventilator in pressure-support ventilation.
- Respiratory System Driving Pressure measure by Respironics NM3 device (DPrs-NM3) [Study day 1]
Driving pressure in centimeters of water measured with Phillips Respironics NM3 device in pressure-support ventilation.
- Airway Occlusion Test (AOC) [Study day 1]
Maximum negative airway pressure in centimeters of water during an airway occlusion maneuver.
- Respiratory System Driving Pressure measured during volume control breath. [Study day 1]
Airway driving pressure in centimeters of water measured with inspiratory hold in volume control/assist control.
- Transpulmonary Driving pressure measured during volume control breath. [Study day 1]
Transpulmonary driving pressure in centimeters of water measured via esophageal balloon with inspiratory hold in volume control/assist control.
Secondary Outcome Measures
- Duration of mechanical ventilation [Index hospitalization (up to 28 days)]
Number of days receiving mechanical ventilation
- Duration of intensive care unit admission [Index hospitalization (up to 28 days)]
Number of days admitted to intensive care unit
- Duration of hospital admission [Index hospitalization (up to 28 days)]
Number of days admitted to hospital
- Ventilator Free Days [Index hospitalization (up to 28 days)]
Number of days free from mechanical ventilation
- In-hospital survival [Index hospitalization (up to 28 days)]
Survival to discharge
Adult patients age ≥18 years with acute respiratory failure receiving invasive mechanical ventilation
Managed in pressure-support mode of ventilation
Actively undergoing a spontaneously awakening trial or SAT
Patient or surrogate is unable to provide informed consent
Acute exacerbation of an obstructive lung disease
Known esophageal varices or any other condition for which the attending physician deems an orogastric catheter to be unsafe
Esophageal, gastric or duodenal surgical procedures within the last 6 months
Contacts and Locations
|1||Duke University Hospital||Durham||North Carolina||United States||27710|
Sponsors and Collaborators
- Duke University
- Principal Investigator: Neil R MacIntyre, MD, Professor of Medicine
Study Documents (Full-Text)None provided.
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