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Influence of Lung Recruitment Potential on PEEP Titration Strategies in ARDS Patients. (RECRUIT-PEEP)

18. maj 2026 opdateret af: Hospital Dr. Franco Ravera Zunino

Influence of the Lung Recruitment Potential on the Response to Two PEEP Titration Strategies in Patients With Acute Respiratory Distress Syndrome (ARDS)

Acute Respiratory Distress Syndrome (ARDS) is characterized by severe hypoxemia and diffuse alveolar collapse, often requiring invasive mechanical ventilation. Non-individualized mechanical ventilation settings can cause ventilator-induced lung injury (VILI). Positive end-expiratory pressure (PEEP) prevents alveolar collapse, but its effect varies among individuals. The recruitment-to-inflation (R/I) ratio evaluates bedside lung recruitment potential. This pilot study aims to compare two individualized PEEP titration strategies-one guided by the best static respiratory compliance and another guided by transpulmonary pressure via an esophageal balloon-and evaluate how baseline lung recruitment potential alters the early physiological responses to these interventions. Both strategies are preceded by an identical, standardized pressure-controlled initial lung recruitment maneuver to establish a baseline recruitment state.

Studieoversigt

Status

Ikke rekrutterer endnu

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

This is a prospective, randomized, open-label, parallel-group pilot study conducted at the Adult Intensive Care Unit of Hospital Dr. Franco Ravera Zunino (HFRZ). Eligible adult patients under invasive mechanical ventilation with moderate-to-severe ARDS within 36 hours of fulfilling Berlin criteria will be evaluated.

Prior to randomization, the patient's recruitment potential will be measured bedside using the R/I ratio (where > 0.5 indicates high recruitment potential and <= 0.5 indicates low potential). Eligible participants will then be randomized 1:1 into two PEEP titration groups:

  1. PEEP titration targeted to achieve the best static compliance of the respiratory system.
  2. PEEP titration guided by transpulmonary pressure measured via an esophageal balloon to target a positive end-expiratory transpulmonary pressure.

Crucially, immediately before starting the specific PEEP titration protocol in either group, an identical, standardized lung recruitment maneuver will be performed. This maneuver is executed in pressure-controlled ventilation (PCV) with a control pressure of 15 cmH2O, I:E ratio of 1:1, FiO2 1.0, starting with PEEP 5 cmH2O and increasing by 5 cmH2O every 10 seconds up to PEEP 25 cmH2O, maintaining a maximum peak pressure limit of 40 cmH2O for exactly 1 minute.

Standard baseline ventilator parameters will follow protective ventilation targets: volume-controlled ventilation, tidal volume 6-8 mL/kg of predicted body weight, respiratory rate adjusted to keep pH 7.25-7.45, plateau pressure < 28 cmH2O, and driving pressure < 14 cmH2O. Physiological parameters (PaO2/FiO2, driving pressure, ventilatory ratio, static compliance) will be recorded at 1, 24, 48, and 72 hours. The primary outcome is the change in oxygenation (PaO2/FiO2 ratio) at 24 hours. The study will explore how the baseline phenotype of lung recruitability alters early mechanical and gas exchange outcomes.

Undersøgelsestype

Interventionel

Tilmelding (Anslået)

52

Fase

  • Ikke anvendelig

Kontakter og lokationer

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Studiekontakt

Undersøgelse Kontakt Backup

Deltagelseskriterier

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Berettigelseskriterier

Aldre berettiget til at studere

  • Voksen
  • Ældre voksen

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Ingen

Beskrivelse

Inclusion Criteria:

  • Diagnosis of moderate or severe Acute Respiratory Distress Syndrome (ARDS) according to the Berlin definition: acute onset, bilateral opacities not fully explained by heart failure or fluid overload, and PaO2/FiO2 <= 200 mmHg with PEEP >= 5 cmH2O.
  • ARDS duration < 36 hours since fully meeting Berlin consensus criteria.
  • Relative hemodynamic stability: absence of refractory shock, defined as norepinephrine dose <= 0.5 mcg/kg/min.

Exclusion Criteria:

  • Evidence of active pulmonary air leaks (bronchopleural fistula, pneumothorax, pneumomediastinum).
  • Severe uncorrected hemodynamic instability (norepinephrine > 0.5 mcg/kg/min).
  • Contraindications for esophageal balloon placement (esophageal obstruction, known perforation, recent esophageal surgery, severe esophagitis).
  • Elevated intracranial pressure or conditions where hypercapnia-induced increases in intracranial pressure must be avoided (intracranial hemorrhage, cerebral contusion, cerebral edema, mass effect with midline shift on CT).
  • Known pregnancy.
  • Severe coagulopathy (platelet count < 5,000/uL or INR > 3).
  • Airway opening pressure higher than 15 cmH2O (AOP > 15 cmH2O).
  • History of severe neuromuscular disease or chronic respiratory disease.
  • Having received invasive mechanical ventilation for more than 96 hours.
  • Inability to obtain informed consent or refusal by the legal representative.
  • Contained laparotomy (open abdomen).

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Behandling
  • Tildeling: Randomiseret
  • Interventionel model: Parallel tildeling
  • Maskning: Ingen (Åben etiket)

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Eksperimentel: Best Static Compliance Titration
Patients receive positive end-expiratory pressure (PEEP) titration guided by the best static compliance of the respiratory system after undergoing a standardized initial lung recruitment maneuver
Procedure: PEEP Titration guided by Static Compliance

PEEP Titration by Static Compliance: Following the initial recruitment maneuver, an individualized PEEP decremental titration step-protocol is performed to identify the specific PEEP level that maximizes the static compliance of the respiratory system, aiming to optimize the balance between alveolar recruitment and overdistension.

Initial Lung Recruitment Maneuver : Prior to individualized PEEP titration, all participants in this arm will undergo an initial standardized lung recruitment maneuver. This procedure will be executed in Pressure-Controlled Ventilation (PCV) mode, utilizing a driving/control pressure of 15 cmH2O. The recruitment process will begin at a baseline Positive End-Expiratory Pressure (PEEP) of 5 cmH2O, followed by incremental steps of 5 cmH2O every 10 seconds until reaching a maximum PEEP of 25 cmH2O. A peak airway pressure limit of 40 cmH2O will be strictly maintained during the maneuver for a total duration of 1 minute.

Andre navne:
  • Initial Lung Recruitment Maneuver
Eksperimentel: Transpulmonary Pressure Titration
Patients receive positive end-expiratory pressure (PEEP) titration guided by transpulmonary pressure estimation via an esophageal balloon catheter after undergoing an identical standardized initial lung recruitment maneuver.
Procedure: PEEP Titration guided by Transpulmonary Pressure

PEEP Titration by Transpulmonary Pressure: Following the initial recruitment maneuver, PEEP is titrated and protocolized via real-time esophageal balloon monitoring to target and maintain a slightly positive expiratory transpulmonary pressure, minimizing cyclic alveolar collapse and overdistension.

Initial Lung Recruitment Maneuver: Prior to individualized PEEP titration, all participants in this arm will undergo an initial standardized lung recruitment maneuver. This procedure will be executed in Pressure-Controlled Ventilation (PCV) mode, utilizing a driving/control pressure of 15 cmH2O. The recruitment process will begin at a baseline Positive End-Expiratory Pressure (PEEP) of 5 cmH2O, followed by incremental steps of 5 cmH2O every 10 seconds until reaching a maximum PEEP of 25 cmH2O. A peak airway pressure limit of 40 cmH2O will be strictly maintained during the maneuver for a total duration of 1 minute.

Andre navne:
  • Initial Lung Recruitment Maneuver

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Change in Early Oxygenation (PaO2/FiO2 Ratio).
Tidsramme: Baseline and 24 hours post-PEEP titration
The change in gas exchange efficiency is calculated as the absolute difference between the baseline PaO2/FiO2 ratio and the PaO2/FiO2 ratio measured 24 hours after individualized PEEP titration.
Baseline and 24 hours post-PEEP titration

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Evolution of Static Compliance of the Respiratory System
Tidsramme: Baseline, 1, 24, 48, and 72 hours
Changes in static compliance calculated via the formula: Tidal Volume / (Plateau Pressure - PEEP).
Baseline, 1, 24, 48, and 72 hours
Evolution of Driving Pressure and Plateau Pressure
Tidsramme: Baseline, 1, 24, 48, and 72 hours
Serial monitoring of driving pressure (Plateau Pressure - PEEP) and plateau pressure to evaluate lung stress.
Baseline, 1, 24, 48, and 72 hours
Ventilatory Efficiency
Tidsramme: Baseline, 24, 48, and 72 hours
Evaluated using the Ventilatory Ratio (VR), which correlates physiological dead space and minute ventilation.
Baseline, 24, 48, and 72 hours
Incidence of Elevated Airway Opening Pressure (AOP)
Tidsramme: Pre-randomization (Baseline)
Proportion of patients exhibiting an airway opening pressure greater than 5 cmH2O.
Pre-randomization (Baseline)
Ventilator-Free Days (VFD)
Tidsramme: Up to Day 28
Number of days alive and free from invasive mechanical ventilation within a 28-day window.
Up to Day 28
Incidence of Procedure-Related Adverse Events
Tidsramme: Throughout mechanical ventilation (Up to 28 days)
Proportion of participants experiencing complications due to recruitment maneuvers or PEEP titration (e.g., severe hypotension, barotrauma).
Throughout mechanical ventilation (Up to 28 days)

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Hospital Dr. Franco Ravera Zunino

Efterforskere

  • Studiestol: Francisco Cerda, RT., Hospital Dr. Franco Ravera Zunino
  • Studiestol: Javier Astudillo, MD., Hospital Dr. Franco Ravera Zunino
  • Studiestol: Jennifer Ayuso, RT., Hospital Dr. Franco Ravera Zunino
  • Studiestol: Rodrigo Arevalo, RT., Hospital Dr. Franco Ravera Zunino
  • Studiestol: Carlos Pellegrini, MD., Hospital Dr. Franco Ravera Zunino
  • Ledende efterforsker: Esteban Santis, RT., Hospital Dr. Franco Ravera Zunino

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Anslået)

1. juni 2026

Primær færdiggørelse (Anslået)

30. juni 2027

Studieafslutning (Anslået)

30. september 2027

Datoer for studieregistrering

Først indsendt

18. maj 2026

Først indsendt, der opfyldte QC-kriterier

18. maj 2026

Først opslået (Faktiske)

22. maj 2026

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

22. maj 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

18. maj 2026

Sidst verificeret

1. maj 2026

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • HFRZ-UPC-2026-01

Plan for individuelle deltagerdata (IPD)

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UBESLUTET

IPD-planbeskrivelse

It is not yet known if there will be a plan to make IPD available

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