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End-Expiratory Diaphragmatic Residual Contraction Index for Identifying Intrinsic PEEP and Assisting PEEP Titration: A Prospective Physiological Study

5 juli 2026 uppdaterad av: Huiqing Ge, Sir Run Run Shaw Hospital
This study proposes the End-expiratory Diaphragmatic Residual Contraction (EDRC) index to quantify residual diaphragmatic activity at end-expiration during Pressure Support Ventilation (PSV) mode. The study aims to validate the relationship between EDRC and dynamic intrinsic PEEP (PEEPi), triggering load, patient-ventilator asynchrony, and PEEP responsiveness through a brief, standardized PEEP titration trial conducted within a clinically safe range. This will provide a basis for subsequent individualized PEEP setting guided by EDRC.

Studieöversikt

Status

Har inte rekryterat ännu

Betingelser

Intervention / Behandling

Studietyp

Observationell

Inskrivning (Beräknad)

100

Kontakter och platser

Det här avsnittet innehåller kontaktuppgifter för dem som genomför studien och information om var denna studie genomförs.

Studiekontakt

  • Namn: Huiqing Ge, MD
  • Telefonnummer: +8613588706787
  • E-post: gehq@zju.edu.cn

Studera Kontakt Backup

Deltagandekriterier

Forskare letar efter personer som passar en viss beskrivning, så kallade behörighetskriterier. Några exempel på dessa kriterier är en persons allmänna hälsotillstånd eller tidigare behandlingar.

Urvalskriterier

Åldrar som är berättigade till studier

  • Vuxen
  • Äldre vuxen

Tar emot friska volontärer

Nej

Testmetod

Icke-sannolikhetsprov

Studera befolkning

The study population will consist of adult patients ($\ge$ 18 years) admitted to the Intensive Care Unit (ICU) who are receiving invasive mechanical ventilation in Pressure Support Ventilation (PSV) mode. Participants will be recruited from the ICU at [Insert Name of Hospital/Institution].

The population is characterized by patients who are clinically assessed as having a risk of dynamic intrinsic PEEP (PEEPi,dyn) or are undergoing a spontaneous breathing trial (SBT) as part of the weaning process. All enrolled patients will have an indwelling esophageal balloon catheter placed for the measurement of esophageal pressure (Pes), which serves as the reference standard for respiratory mechanics.

Patients will be screened for eligibility based on hemodynamic stability and the ability to tolerate the study procedures. Specific exclusion criteria include pregnancy, severe esophageal pathology, severe hypoxemia, and conditions precluding diaphragmatic ultrasound imaging (e.g., chest wall tra

Beskrivning

Inclusion Criteria:

  • Age ≥ 18 years. Patients receiving invasive mechanical ventilation in Pressure Support Ventilation (PSV) mode.

Clinically assessed as having a risk of dynamic intrinsic PEEP (PEEPi,dyn) or experiencing difficult weaning from mechanical ventilation.

Presence of an indwelling esophageal balloon catheter (for reference standard measurements).

Provision of written informed consent from the patient or legally authorized representative.

Exclusion Criteria:

  • Pregnancy or lactation. Known esophageal diseases (e.g., esophageal varices, strictures, recent esophageal surgery) or contraindications to esophageal catheter placement.

Severe hemodynamic instability (e.g., requiring high-dose vasoactive support, uncontrolled arrhythmias).

Severe hypoxemia (PaO2/FiO2 < 100 mmHg) or severe hypercapnia with hemodynamic compromise at baseline.

Conditions precluding ultrasound assessment of the diaphragm (e.g., extensive chest wall trauma, large pleural effusion, severe subcutaneous emphysema).

Active spontaneous breathing with severe patient-ventilator asynchrony that cannot be stabilized during the trial.

Anticipated extubation or withdrawal of life-sustaining treatment within the next 24 hours.

Participation in another interventional clinical trial within the last 30 days.

Studieplan

Det här avsnittet ger detaljer om studieplanen, inklusive hur studien är utformad och vad studien mäter.

Hur är studien utformad?

Designdetaljer

Kohorter och interventioner

Grupp / Kohort
Intervention / Behandling
Patients Undergoing PEEP Step Trial and EDRC Assessment
All enrolled patients will receive a standardized, short-term PEEP step trial while in Pressure Support Ventilation (PSV) mode. The trial consists of sequentially applying PEEP levels of Baseline, -2, +2, +4, and +6 cmH2O relative to the set PEEP. At each step, respiratory mechanics and patient-ventilator synchrony will be monitored. The primary intervention of interest is the assessment of End-Expiratory Diaphragmatic Residual Contraction (EDRC) via ultrasound to identify the presence of intrinsic PEEP (PEEPi) and to determine the optimal level of extrinsic PEEP that minimizes diaphragmatic effort and asynchrony.
Enhet: Short-term PEEP Step Trial and EDRC Ultrasound Assessment
This intervention involves a standardized, short-term PEEP step trial combined with a novel physiological assessment. During the trial, external PEEP is systematically adjusted in 2 cmH2O increments (Baseline, -2, +2, +4, +6 cmH2O) while maintaining stable Pressure Support Ventilation (PSV) settings. Simultaneously, the End-Expiratory Diaphragmatic Residual Contraction (EDRC) index is evaluated using diaphragm ultrasound speckle tracking. This distinguishes the intervention by providing a non-invasive, real-time quantification of residual diaphragmatic tension at end-expiration, which serves as a surrogate marker for dynamic intrinsic PEEP (PEEPi) and trigger load, distinguishing it from traditional static measurements or esophageal manometry alone.

Vad mäter studien?

Primära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Diagnostic Efficacy of EDRC-AUC for Identifying Clinically Significant Dynamic Intrinsic PEEP
Tidsram: During the short-term PEEP step trial (each PEEP level is maintained for 5-10 minutes)
The primary outcome is the diagnostic efficacy of the End-Expiratory Diaphragmatic Residual Contraction Area Under the Curve (EDRC-AUC) in identifying clinically significant dynamic intrinsic PEEP (PEEPi,dyn ≥ 5 cmH2O) in patients undergoing Pressure Support Ventilation (PSV). The diagnostic performance will be evaluated using Receiver Operating Characteristic (ROC) curve analysis, reporting the Area Under the Curve (AUC), optimal cut-off value, sensitivity, specificity, positive predictive value, and negative predictive value, with esophageal manometry and flow curves as the reference standard.
During the short-term PEEP step trial (each PEEP level is maintained for 5-10 minutes)

Sekundära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Correlation between EDRC-AUC and Respiratory Drive/Load Indices
Tidsram: During the short-term PEEP step trial (each PEEP level maintained for 5-10 minutes) and within 30 minutes post-trial
To evaluate the correlation (using Pearson or Spearman correlation coefficients) between the End-Expiratory Diaphragmatic Residual Contraction Area Under the Curve (EDRC-AUC)
During the short-term PEEP step trial (each PEEP level maintained for 5-10 minutes) and within 30 minutes post-trial
Incidence of Patient-Ventilator Asynchrony Events
Tidsram: During the short-term PEEP step trial (each PEEP level maintained for 5-10 minutes) and within 30 minutes post-trial.
To record and compare the total incidence and distribution of patient-ventilator asynchrony events across different PEEP levels. Specific events include:Ineffective triggering;Double triggering;Auto-triggering;Short or long cycling.
During the short-term PEEP step trial (each PEEP level maintained for 5-10 minutes) and within 30 minutes post-trial.
Agreement between EDRC-Guided PEEP and Esophageal Manometry-Guided PEEP
Tidsram: During the short-term PEEP step trial (each PEEP level maintained for 5-10 minutes) and within 30 minutes post-trial.
To compare the optimal PEEP level determined by the EDRC minimization principle with the optimal PEEP level determined by esophageal manometry (minimizing driving pressure or PTP). Bland-Altman analysis will be used to evaluate the mean bias and limits of agreement between the two methods.
During the short-term PEEP step trial (each PEEP level maintained for 5-10 minutes) and within 30 minutes post-trial.
Trends in Diaphragmatic Contraction Dynamics Across PEEP Levels
Tidsram: During the short-term PEEP step trial (each PEEP level maintained for 5-10 minutes) and within 30 minutes post-trial.
To observe and describe the dynamic trends of diaphragm thickening fraction (DTF) and the EDRC index across all phases of the PEEP step trial (Baseline, -2, +2, +4, +6 cmH2O), assessing the bidirectional effects of extrinsic PEEP on diaphragmatic load.
During the short-term PEEP step trial (each PEEP level maintained for 5-10 minutes) and within 30 minutes post-trial.
Feasibility and Inter-Observer Reliability of EDRC Ultrasound Measurements
Tidsram: During the short-term PEEP step trial (each PEEP level maintained for 5-10 minutes) and within 30 minutes post-trial.
Feasibility: The proportion of patients from whom analyzable ultrasound images were successfully obtained; Reproducibility: The intra-class correlation coefficient (ICC) for EDRC-AUC measurements between different operators (inter-observer) and by the same operator at different time points (intra-observer).
During the short-term PEEP step trial (each PEEP level maintained for 5-10 minutes) and within 30 minutes post-trial.
Adverse Events During the PEEP Step Trial
Tidsram: During the short-term PEEP step trial (each PEEP level maintained for 5-10 minutes) and within 30 minutes post-trial.

To document any clinical adverse events occurring during the PEEP titration process, including:

Hemodynamic instability (e.g., systolic blood pressure decrease >20% or increased requirement for vasoactive drugs); Severe hypoxemia (SpO2 < 88% lasting >1 minute); Severe arrhythmias; Significant respiratory distress or intolerance requiring premature termination of the trial.
During the short-term PEEP step trial (each PEEP level maintained for 5-10 minutes) and within 30 minutes post-trial.

Samarbetspartners och utredare

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Sponsor

Sir Run Run Shaw Hospital

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Studieavstämningsdatum

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Studera stora datum

Studiestart (Beräknad)

21 augusti 2026

Primärt slutförande (Beräknad)

24 augusti 2027

Avslutad studie (Beräknad)

3 september 2027

Studieregistreringsdatum

Först inskickad

5 juli 2026

Först inskickad som uppfyllde QC-kriterierna

5 juli 2026

Första postat (Faktisk)

13 juli 2026

Uppdateringar av studier

Senaste uppdatering publicerad (Faktisk)

13 juli 2026

Senaste inskickade uppdateringen som uppfyllde QC-kriterierna

5 juli 2026

Senast verifierad

1 juli 2026

Mer information

Termer relaterade till denna studie

Andra studie-ID-nummer

  • 20260627

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