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Immune Alveolar Alterations During Pneumonia-Associated Acute Respiratory Distress Syndrome (PICARD2)

29 maggio 2019 aggiornato da: Assistance Publique - Hôpitaux de Paris

Sepsis is a dysregulated host response to severe life-threatening infections, leading to organ failure and death in up to 40% of patients with septic shock. Pulmonary infections are the main cause of community-acquired sepsis and frequently lead to the development of acute respiratory distress syndrome(ARDS). Features of immunosuppression, including diminished cell surface monocyte human leukocyte antigen DR (mHLA-DR) expression, are strongly associated with hospital mortality. Such decrease in HLA-DR expression on antigen-presenting cells has been associated with impairment of microbial antigens to Tcells. Septic patients also show elevated expression of inhibitory receptors associated with cell exhaustion.. Yet, biochemical, flow cytometric and immunohistochemical findings consistent with immunosuppression have been observed in lungs and spleen of patients died of sepsis and multiple organ failure, demonstrating the relevance of studying these defects directly in organ tissues. A novel approach aimed to characterize the role and prognostic value of alveolar biomarkers measured directly in the injured lungs is warranted and supported by: -disappointing results of previous clinical trials attempting to restore the level of biomarkers measured on circulating cells; -evidences of regional immunosuppression in lungs of ARDS patients; -lung is the main site of hospital-acquired infections with a prevalence of ventilator-associated pneumonia in 30% over the course of Intensive Care Unit(ICU) stay in ARDS patients.

Investigators speculate that biomarkers measured on alveolar leukocytes (AL) surface, are important predictors of outcome and potential therapeutic targets in ICU patients with pneumonia-associated ARDS.

Investigators aim to explore whether biomarkers measured directly on AL from patients with pneumonia-associated ARDS are associated to regional pulmonary immunosuppression using leukocyte functional tests; and predictors of outcomes.

Bronchoalveolar lavage fluid(BALF) and blood samples will be collected in ARDS patients. Leukocyte populations and cell membrane biomarkers will be quantified using flow cytometry. Leukocyte functional tests will be performed ex vivo on leukocytes collected from BALF and blood samples. Pharmacological interventions will be performed ex vivo.

This project aims to identify biomarkers associated with outcomes and potential therapeutic targets.

Panoramica dello studio

Stato

Sconosciuto

Tipo di studio

Osservativo

Iscrizione (Anticipato)

110

Contatti e Sedi

Questa sezione fornisce i recapiti di coloro che conducono lo studio e informazioni su dove viene condotto lo studio.

Contatto studio

Criteri di partecipazione

I ricercatori cercano persone che corrispondano a una certa descrizione, chiamata criteri di ammissibilità. Alcuni esempi di questi criteri sono le condizioni generali di salute di una persona o trattamenti precedenti.

Criteri di ammissibilità

Età idonea allo studio

18 anni e precedenti (Adulto, Adulto più anziano)

Accetta volontari sani

No

Sessi ammissibili allo studio

Tutto

Metodo di campionamento

Campione non probabilistico

Popolazione di studio

Group 1 : Immunocompetent Acute Respiratory Distress Syndorme (ARDS) patients Group 2 : Immunosuppressed ARDS patients Group 3 : Controls (no ARDS)

Descrizione

Inclusion Criteria:

  • Age ≥ 18 years
  • Affiliated to a social security system
  • Patient informed and have given his non opposition verbally (trustworthy or a family member non opposition is required if the patient is unable to give his non opposition)

Groupe 1 :

- Patient with ARDS secondary to pneumonia defined by following criteria: Intubation and mechanical ventilation for less than 48 hours Lung infection evolving since less than 7 days Bilateral pulmonary radiological opacities compatible with edema pulmonary lesion PaO2 / FiO2 ratio ≤ 300 mmHg with a positive expiratory pressure level ≥ 5 cmH2O

- Absence of immunosuppression (No HIV infection, bone marrow or solid organ transplantation, post-chemotherapy aplasia, immunosuppressive therapy or corticosteroid therapy (>200 mg / day of hydrocortisone or equivalent in the 4 weeks prior to inclusion))

Group 2 - Patient with ARDS secondary to pneumonia defined by following criteria: Intubation and mechanical ventilation for less than 48 hours Lung infection evolving since less than 7 days Bilateral pulmonary radiological opacities compatible with edema pulmonary lesion PaO2 / FiO2 ratio ≤ 300 mmHg with a positive expiratory pressure level ≥ 5 cmH2O

- Previously known immunosuppression (patient with HIV, solid tumor, solid organ transplantation or under corticosteroids therapy since at least 4 weeks before inclusion)

Group 3

  • LBA indicated in usual care
  • Absence of ARDS
  • Absence of evolutionary infection
  • Absence of infiltrative lung disease
  • Absence of immunosuppression (No HIV infection, bone marrow or solid organ transplantation, post-chemotherapy aplasia, immunosuppressive therapy, corticosteroid therapy (> 200 mg / day of hydrocortisone or equivalent in the 4 weeks prior to inclusion))

Exclusion Criteria:

  • Chronic respiratory insufficiency treated by long-term oxygen therapy and / or long-term respiratory assistance
  • Child-Pugh C cirrhosis
  • Pulmonary fibrosis
  • Active lymphoid and myeloid malignant hemopathies
  • Neutropenia (neutrophils <1500 / mm3)
  • Patient moribund the day of inclusion or having an IGS II score greater than 90
  • Irreversible neurological pathology: cerebral involvement, encephalic death
  • Decision to limit active therapies
  • Deep hypoxemia (PaO2 / FiO2 <75 mmHg)
  • Patient protected by law
  • Pregnant or lactating woman

Piano di studio

Questa sezione fornisce i dettagli del piano di studio, compreso il modo in cui lo studio è progettato e ciò che lo studio sta misurando.

Come è strutturato lo studio?

Dettagli di progettazione

  • Modelli osservazionali: Altro
  • Prospettive temporali: Prospettiva

Coorti e interventi

Gruppo / Coorte
Immunocompetent ARDS patients
(n=50) Patients with moderate-to-severe pneumonia-associated Acute Respiratory Distress Syndorme (ARDS) and no immunosuppression (excluding patients with HIV infection, solid tumor or hematological malignancies, organ transplant or taking steroids since more than 4 weeks).
Immunosuppressed ARDS patients
(n=50) Patients with moderate-to-severe pneumonia-associated Acute Respiratory Distress Syndorme (ARDS) (Berlin definition (2)) and previously known immunosuppression (as listed above). These patients will allow comparing the cell defects observed in the study population to those observed in immunosuppressed patients.
Controls
(n=10) Patients undergoing a bronchoscopy with Bronchoalveolar Liquid (BAL) as part of routine care but having neither ARDS nor active lung infection, infiltrating lung disease or immunosuppression. These patients will allow quantifying normal levels of the studied biomarkers in the alveolar and blood compartments.

Cosa sta misurando lo studio?

Misure di risultato primarie

Misura del risultato
Misura Descrizione
Lasso di tempo
HLA-DR expression level of alveolar monocytes at the early phase of infectious Acute Respiratory Distress Syndrome (ARDS)
Lasso di tempo: at day 1 to day 3
Measurement by flow cytometry phagocytosis and TNF-α synthesis of alveolar monocytes in immunocompetent patients, compared to immunocompromised patients
at day 1 to day 3

Misure di risultato secondarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Impact of the level of expression of PD-1 by alveolar CD8 + lymphocytes on their function during septic ARDS in immunocompetent and immunocompromised patients.
Lasso di tempo: at day 1 to day 3
Level of expression of PD-1 by alveolar CD8+ lymphocytes
at day 1 to day 3
Comparaison of the level of HLA-DR expression of alveolar monocytes between immunocompetent and immunosuppressed patients being managed for septic ARDS.
Lasso di tempo: at day 1 to day 3
Level of HLA-DR expression of alveolar monocytes
at day 1 to day 3
Link between the alveolar monocyte HLA-DR expression level and the prognosis of immunocompetent and immunosuppressed patients being managed for septic ARDS.
Lasso di tempo: day 28
Number of days without complication
day 28
Determine wether alveolar biomarkers (HLA-DR and PD-1) are potential candidates for immunomodulation
Lasso di tempo: at day 1 to day 3
To determine if the level of expression of HLA-DR and PD-1 can be modulated by pharmacological intervention
at day 1 to day 3

Collaboratori e investigatori

Qui è dove troverai le persone e le organizzazioni coinvolte in questo studio.

Investigatori

  • Investigatore principale: Nicolas DE PROST, Assistance Publique Hôpitaux de Paris - CHU Henri Mondor - Créteil

Studiare le date dei record

Queste date tengono traccia dell'avanzamento della registrazione dello studio e dell'invio dei risultati di sintesi a ClinicalTrials.gov. I record degli studi e i risultati riportati vengono esaminati dalla National Library of Medicine (NLM) per assicurarsi che soddisfino specifici standard di controllo della qualità prima di essere pubblicati sul sito Web pubblico.

Studia le date principali

Inizio studio (Anticipato)

1 giugno 2019

Completamento primario (Anticipato)

4 giugno 2022

Completamento dello studio (Anticipato)

28 giugno 2022

Date di iscrizione allo studio

Primo inviato

29 maggio 2019

Primo inviato che soddisfa i criteri di controllo qualità

29 maggio 2019

Primo Inserito (Effettivo)

3 giugno 2019

Aggiornamenti dei record di studio

Ultimo aggiornamento pubblicato (Effettivo)

3 giugno 2019

Ultimo aggiornamento inviato che soddisfa i criteri QC

29 maggio 2019

Ultimo verificato

1 maggio 2019

Maggiori informazioni

Termini relativi a questo studio

Piano per i dati dei singoli partecipanti (IPD)

Hai intenzione di condividere i dati dei singoli partecipanti (IPD)?

No

Descrizione del piano IPD

DATAS ARE OWN BY ASSISTANCE PUBLIQUE - HOPITAUX DE PARIS, PLEASE CONTACT SPONSOR FOR FURTHER INFORMATION

Informazioni su farmaci e dispositivi, documenti di studio

Studia un prodotto farmaceutico regolamentato dalla FDA degli Stati Uniti

No

Studia un dispositivo regolamentato dalla FDA degli Stati Uniti

No

Queste informazioni sono state recuperate direttamente dal sito web clinicaltrials.gov senza alcuna modifica. In caso di richieste di modifica, rimozione o aggiornamento dei dettagli dello studio, contattare register@clinicaltrials.gov. Non appena verrà implementata una modifica su clinicaltrials.gov, questa verrà aggiornata automaticamente anche sul nostro sito web .

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