Biphasic Positive Airway Pressure Ventilation Versus Flow-Controlled Ventilation in Burn Patients

N/ANot Yet RecruitingNCT07041957

University Hospital Bergmannsheil Bochum24 enrolled

Overview

The goal of this clinical trial is to learn if the new ventilation mode flow-controlled ventilation (FCV) is a more protective mode of ventilation for adult patients after severe burn injury. The main question it aims to answer is: Does FCV reduce the mechanical power (a key determinant of ventilator-induced lung injury) compared to conventional pressure-controlled ventilation (PCV) during ventilation of patients with burn injury? Researchers will compare FCV with PCV for up to 70 hours of ventilation to see if the mechanical power is reduced during ventilation of participants being in need of ventilation after severe burn injury. Ventilation of participants will be controlled by either FCV or PCV. Group-specific ventilation will have the following characteristics: * FCV: Control of airway flows during inspiration and expiration, use of individualized lower and upper airway pressures and no fixed values for the volumes being inspired and expired (tidal volumes) * PCV: No control of airway flows during expiration, use of individualized lower airway pressures and upper airway pressures for a fixed tidal volume during each breath (6-8 ml/kg ideal body weight) In total, at least 24 participants in need of ventilation after severe burn injury will be ventilated either with FCV (12 participants) or PCV (12 participants) for up to 70 hours. During ventilation mechanical power is computed according to certain ventilation parameters. Additionally, we evaluate organ functions of the cardiovascular systems, the lungs and other organs during and after the group-specific ventilation.

Invasive ventilation can cause ventilator-induced lung injury. There is growing evidence that high mechanical power during (prolonged) controlled ventilation is associated with ventilator-induced lung injury and pulmonary complications. Large animal model and perioperative clinical trial data have shown that the individualized application of the flow-controlled ventilation (FCV) mode can reduce mechanical power compared to conventional pressure-controlled ventilation (PCV). Burn patients with or without inhalational injury are at high risk of pulmonary complications like pneumonias or the acute respiratory distress syndrome due to the hyperinflammatory state and also the intensive care treatment after a burn injury. If these patients need mechanical ventilation, this might aggravate lung injury. With the study BIFLOWBURN we want to test the hypothesis that the mechanical power during controlled ventilation of burn patients is reduced with the individualized application of FCV compared to conventional PCV via Biphasic Positive Airway Pressure (BIPAP) ventilation. BIFLOWBURN is a single-center, randomized, parallel-group trial with two intervention arms: * Controlled BIPAP ventilation (n=12) with a compliance-guided positive end-expiratory pressure (PEEP) and driving pressure (ΔP) for tidal volumes of 6-8 ml/kg predicted body weight compared to * optimized FCV (n=12) with a compliance-guided PEEP and a compliance-guided ΔP, resulting in liberal tidal volumes. The group-specific controlled ventilation mode will be applied for a maximum of 70 hours. As the primary study endpoint, the mechanical power in joules per minute (J/min) is computed during group-specific controlled ventilation. As secondary study aims, clinically relevant patient outcomes are analyzed as explorative secondary outcomes, e.g., lung function, ventilatory parameters, the incidences of pulmonary and extra-pulmonary complications as well as different intensive care scores for the assessment of organ dysfunctions. As an additional sub-study with an exploratory approach, parameters of different advanced haemodynamic monitoring techniques are assessed. Within a further ancillary study, biomarkers of acute lung injury and/or the burn inhalational injury will be characterized by molecular biological methods. BIFLOWBURN is the first randomized controlled trial which assesses mechanical power during the ventilation of burn patients by comparing the alternative mode of flow-controlled ventilation with a conventional ventilation mode.

Interventions

Individualized flow-controlled ventilation strategyOTHER

1. Compliance-guided PEEP trial: An incremental PEEP trial from 5 to 15 cmH2O in 2 cmH2O steps with a constant driving pressure (ΔP) will be performed. At the first PEEP level, the tidal volume is set to 6-8 ml/kg PBW. The best PEEP level is defined as the one with the highest dynamic compliance. Participants are ventilated with this PEEP level + 1-2 cmH2O for a reduction of lung de-recruitment and atelectrauma. 2. Compliance-guided driving pressure (ΔP) trial: In the FCV group, an additional incremental ΔP trial in 1 cmH2O steps is initiated after the PEEP trial. This trial evaluates if the tidal volume increases (over-)proportional to the dynamic compliance on the previous ΔP level when the ΔP is increased by 1 cmH2O. In the FCV group, participants are ventilated with a ΔP consistent with the highest dynamic compliance ± 1-2 cmH2O. The compliance-guided PEEP and ΔP trials are repeated every 8 hours in order to account for changes in overall lung compliance.

Pressure-controlled ventilation strategy via the application of Biphasic Positive Airway Pressure ventilationOTHER

Eligibility

Sex: ALLMin age: 18 YearsMax age: 80 Years

Medical Language ↔ Plain English

Inclusion Criteria: * Body weight ≥ 40 kg * Invasive ventilation time ≤ 24 hours before admission to the burn ICU or indication for intubation and invasive ventilation within 48 hours after admission to the burn ICU * Estimated (further) invasive ventilation time ≥ 24 hours * Intervention start within 48 hours after admission to the burn ICU * Establishment of a central venous line and invasive blood pressure monitoring as part of the intensive care therapy before the intervention start * Signed informed consent from the participant, legal guardian, next of kin in incompetent patients, or an intensivist in charge and independent from the Trial Management Committee in incompetent patients without a representative of the patients will Exclusion Criteria: * Participation in another interventional trial * Duration of invasive ventilation \> 24 hours at the time point of admission to the burn ICU * Estimated (further) invasive ventilation time \< 24 hours * Patients being treated in the burn ICU for (suspected) severe skin reactions such as Stevens-Johnson syndrome (SJS) or toxic epidermal necrolysis (TEN) * Lack of consent from the participant, legal guardian, next of kin, or intensivist in charge to participate in the study

Outcomes

Primary Outcomes

Mechanical power

We will compute mechanical power in joules per minute (J/min) hourly according to the surrogate formulae \[Minute ventilation \* (Peak airway pressure + PEEP + Inspiratory flow/6)\]/20 for FCV and 0.098 \* respiratory rate \* tidal volume \* \[PEEP + ΔP\] for PCV/BIPAP

Time frame: Mechanical power will be assessed hourly during up to 70 hours of controlled, group-specific ventilation.

Secondary Outcomes

Dissipated energy/power

The hysteresis of the pressure-volume loop represents the dissipated energy in joules, that is dissipated during one ventilation cycle. The dissipated power per unit time can be computed by the respiratory rate per unit time, e.g. Joules per minute (J/min).

Time frame: The dissipated energy/power will be assessed at least hourly/continously during up to 70 hours of controlled, group-specific ventilation.

Respiratory rate

Respiratory rate per minute

Time frame: Respiratory rates will be assessed hourly during up to 70 hours of controlled, group-specific ventilation.

Tidal volume

Tidal volume in ml

Time frame: Tidal volumes will be assessed hourly during up to 70 hours of controlled, group-specific ventilation.

Minute volume

Minute volume in liter per minute

Time frame: Minute volumes will be assessed hourly during up to 70 hours of controlled, group-specific ventilation.

Airway pressures

Airway pressures like positive end-expiratory pressure (PEEP), peak airway pressure, driving pressure (ΔP) and mean airway pressure in cmH2O

Time frame: Airway pressures will be assessed hourly during up to 70 hours of controlled, group-specific ventilation.

Dynamic compliance

Dynamic compliance in ml per cmH2O will be calculated according to the formula tidal volume/driving pressure.

Time frame: Dynamic compliances will be assessed hourly during up to 70 hours of controlled, group-specific ventilation.

Airway resistance

Airway resistance in cmH2O/L/s as displayed on the ventilator.

Time frame: Airway resistances will be assessed hourly during up to 70 hours of controlled, group-specific ventilation.

Oxygenation indices

Computed as partial pressure of arterial oxygen/inspired oxygen fraction

Time frame: Oxygenation indices will be assessed every 4-8 hours with arterial blood gas analyses during up to 70 hours of controlled, group-specific ventilation.

Pulmonary complications

Incidence of pulmonary complications including but not limited to need for non-invasive ventilation / high flow nasal cannula therapy, reintubation, tracheotomy, prone positioning, ARDS, pleural effusions, pneumothorax, bronchoscopy, suspected or confirmed pneumonia

Time frame: Pulmonary complications will be assessed within the first ten days after randomization.

Extra-pulmonary complications

Incidence of extra-pulmonary complications including but not limited to systemic inflammatory response syndrome (SIRS), sepsis, septic shock, new arrythmias, cardiac arrest, infection other than pneumonia treated with antibiotics, delirium, acute kidney injury

Time frame: Extra-pulmonary complications will be assessed within the first ten days after randomization.

Sequential Organ Failure Assessment (SOFA) Score

The Sequential Organ Failure Assessment (SOFA) Score ranges from zero (no organ failure present) to 24 (most severe failure in all assessed organ systems).

Time frame: The Sequential Organ Failure Assessment (SOFA) Score will be assessed daily within the first ten days after randomization.

Lung Injury Score (Murray)

The Murray Score for Acute Lung Injury is ranging from zero (no lung injury) to 16 (most severe lung injury).

Time frame: The Lung Injury Score will be assessed daily within the first ten days after randomization.

Acute Physiology and Chronic Health Evaluation (APACHE) Score

The Acute Physiology and Chronic Health Evaluation (APACHE) Score provides an estimate of in-hospital ICU mortality with lower score values being associated with a lower mortality rate and higher score values being associated with a higher mortality rate.

Time frame: The Acute Physiology and Chronic Health Evaluation (APACHE) Score will be assessed daily within the first ten days after randomization.

Duration of invasive ventilation

The total length of invasive ventilation will be assessed in minutes.

Time frame: Participants will be followed-up on length of invasive ventilation for 6 months after the interventions.

Length of stay

Participant will be monitored on ICU and hospital length of stay in days.

Time frame: Participants will be followed-up for 6 months after the interventions.

Mortality

Mortality of participants will be monitored up to 6 months after the interventions.