Regional Lung Inflammation and Expansion in Mechanically Ventilated Patients - a PET/CT Study

Massachusetts General Hospital1 site in 1 country10 target enrollmentJanuary 2008

ConditionsRespiratory Failure

Overview

Phase: Not Applicable
Intervention: Not specified
Conditions: Respiratory Failure
Sponsor: Massachusetts General Hospital
Enrollment: 10
Locations: 1
Primary Endpoint: Regional 18F-FDG activity
Last Updated: 9 years ago

Overview Investigators Eligibility Criteria Outcomes Sites Similar Trials

Overview

Brief Summary

The goal of this study is to investigate acute respiratory distress syndrome (ARDS) and septic lung with positron emission tomography (PET) imaging and to examine the distribution of inflammation, as measured by neutrophil metabolic activity.

Registry

clinicaltrials.gov

Start Date

January 2008

End Date

March 2019

Last Updated

9 years ago

Study Type

Observational

Sex

All

Investigators

Sponsor

Massachusetts General Hospital

Responsible Party

Principal Investigator

Marcos Vidal Melo

Associate Professor, Harvard University

Massachusetts General Hospital

Eligibility Criteria

Inclusion Criteria

•Mechanically ventilated patients scheduled to undergo a CT scanning for their routine clinical care
•More than 24 hours of mechanical ventilation
•Less than 15 days of mechanical ventilation if patient presents ALI/ARDS (in order to exclude the late, fibrotic, stage of ARDS)
•Mechanically ventilated patients with a diagnosis of sepsis
•Less than 96 hours of mechanical ventilation

Exclusion Criteria

•Age less than 18 years
•Hemodynamic instability, defined as: systolic blood pressure (SBP) \< 90 mmHg that is not adequately stabilized by vasopressors or inotropic agents. For these purposes, SBP will not be considered "adequately stabilized" if the dose of the vasopressor/inotrope has not been stable for at least one hour
•Hypoxemia, defined as: PaO2 \< 70 mmHg on an inspired oxygen fraction (FiO2) greater than or equal to 0.9; FiO2 greater than or equal to 0.8 at baseline
•Hemodynamic and/or respiratory instability (as defined, respectively, in 2 and 3), that develop when the patient is mobilized during routine nursing care such as repositioning/washing the patient or changing their bed linens
•Hemodynamic and/or respiratory instability (as defined, respectively, in 2 and 3), that develop when a 15-25 second respiratory pause is introduced as per the study protocol. This will be tested by inducing such a pause prior to transporting the patient
•Patients must be deemed by the treating clinical staff to be able to tolerate leaving the ICU for 90 minutes (40-60 minute imaging time + 30 minute safety margin). Treating MD, RT, and RN must all agree that the patient is stable for transport
•Any acute or chronic condition which, in the opinion of the investigator, might confound the imaging measurements (such as, but not limited to, severe bronchospasm, pulmonary infection, and lung tumor)
•"Air leaks" requiring tube thoracostomy (e.g., pneumothorax, bronchopleural fistula)
•Pregnancy (since this is a study which would expose a fetus to radiation risk)
•Patients who have neither an arterial nor a central venous line at the time of the enrollement

Outcomes

Primary Outcomes

Regional 18F-FDG activity

Time Frame: Day of imaging.

Each patient will undergo PET-CT scans and the regional 2-18F-fluoro-2-deoxy-D-glucose (18F-FDG) activity will be measured. This is a measure of regional neutrophil metabolic activity and is used to assess inflammation in the lung. The degree of inflammation will be related to the regional expansion of the lung, as measured by CT scan.