- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT01998139
Endothelial Microparticles as a Biomarker for Diagnosis and Prognosis in Early Sepsis
Study Overview
Status
Conditions
Detailed Description
In the presence of infection, normal immune and physiologic responses act in concert to eradicate pathogens. When these responses are inappropriately regulated, sepsis develops. Sepsis is characterized by systemic manifestations of infection. The diagnosis is made by identifying at least 2 of the components of the systemic inflammatory response syndrome (SIRS), based on four clinical and laboratory criteria: respiratory rate, tachycardia, temperature, and leukocyte level in the presence of a documented infection. The presence of acute organ dysfunction in this setting defines severe sepsis, and hypotension that is not reversed with fluid administration defines the entity of septic shock. Severe sepsis as well as its most severe form, septic shock, are significant global health concerns, afflicting millions of patients worldwide, increasing in incidence, and having an associated mortality rate of >25%. In the United States alone, an estimated 750,000 people develop sepsis or severe sepsis each year, and sepsis/septic shock is the 11th leading illness leading to mortality in the US. The annual cost burden of sepsis is estimated to be more than $17 billion. For these reasons, clinical investigators interested in sepsis have directed efforts toward identifying a biomarker that would be useful in making an early diagnosis of sepsis. In addition to early diagnosis, biomarkers for prognosis have been sought to guide severity assessment and to guide more personalized treatment of individual patients.
Endothelial Activation in Sepsis Endothelial activation occurs early in systemic infections and is an adaptive response, allowing leukocyte migration to sites of microbial invasion. In sepsis, however, endothelial activation is excessive and poses the following risks: harm via tissue damage due to excessive leukocyte recruitment, disseminated intravascular coagulation (DIC) relating to loss of endothelial anticoagulant properties, apoptotic death of endothelial cells, and loss of microvascular barrier function. The dysfunctional endothelial barrier leads to vascular leak and tissue edema, hallmarks of sepsis. This loss of endothelial barrier function is linked to increased morbidity and mortality in animal models of sepsis.
Endothelial Microparticles Microparticles are intact vesicles of a size 0.2-2.0 μm which are released from plasma membranes of multiple cell types in the setting of cell injury, activation, and/or apoptosis. In healthy individuals, microparticles found in the plasma are derived from platelets, erythrocytes, leukocytes, and endothelial cells. EMPS generally circulate at a relatively low level and reflect normal endothelial cell turnover. Elevated circulating levels of EMPs can be identified in a number of illnesses including sickle cell disease, immune-mediated thrombotic syndromes such as antiphospholipid syndrome and heparin-induced thrombocytopenia, diabetes, chronic renal failure, acute coronary syndrome, stroke, venous thromboembolic disease, metabolic syndrome, severe hypertension, paroxysmal nocturnal hemoglobinuria, and multiple sclerosis. The functional roles that may be played by endothelial microparticles are diverse and include neutrophil activation, chemotactic attraction of leukocytes, platelet aggregation, generation of thrombin (in vitro) and superoxide anions, stimulation of endothelial proliferation, induction of angiogenesis, MMP-2 and MMP-9 expression enabling vascular invasion of the basement membrane, and carrying of endothelial proteins and protein C.
Given the importance of the endothelium in the pathogenesis of sepsis, we propose to examine the role of endothelial-derived microparticles (EMPs) as a biomarker in sepsis.
Study Type
Enrollment (Actual)
Contacts and Locations
Study Locations
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Doha, Qatar
- Hamad Medical Corporation
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New York
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New York, New York, United States, 10021
- Weill Cornell Medical College
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Sampling Method
Study Population
Description
Inclusion Criteria:
- Adults age 18 and older
- Clinician-suspected diagnosis of sepsis
- Willingness of subject or Legally Authorized Representative (LAR) to participate in the study
Exclusion Criteria:
- Desire to forego life-sustaining therapy
- Trauma or surgical subjects
- Pregnancy
- Subjects who, in the opinion of the treating physician and/or investigator, would be at increased risk by the additional blood draw, for instance, subjects with severe anemia, or subjects with anemia who are unwilling or unable to receive blood transfusions
Study Plan
How is the study designed?
Design Details
- Observational Models: Cohort
- Time Perspectives: Retrospective
Cohorts and Interventions
Group / Cohort |
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Test Cohort
EMP levels will be measured at ICU admission in subjects with physician-suspected sepsis.
For each subject, the final diagnosis of sepsis or non-sepsis critical illness will be adjudicated using standard criteria.
The subjects without sepsis will form the Test Cohort.
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Validation Cohort
EMP levels will be measured at ICU admission in subjects with physician-suspected sepsis.
For each subject, the final diagnosis of sepsis or non-sepsis critical illness will be adjudicated using standard criteria.The subjects determined to have sepsis will serve as the Validation Cohort .
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
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EMP level as predictive biomarker for diagnosis of sepsis.
Time Frame: 5 days
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To evaluate the hypothesis that EMP level is a predictive biomarker for the diagnosis of sepsis.
For the primary objective, a prospective, cross-sectional, case control design will be utilized.
EMP levels will be measured at ICU admission in subjects with physician-suspected sepsis.
For each subject, the final diagnosis of sepsis or non-sepsis critical illness will be adjudicated using standard criteria, and the subjects determined to have sepsis will serve as the cases while those subjects without sepsis will form the control group.
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5 days
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
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EMP level as a predictive biomarker for mortality in sepsis.
Time Frame: 30 days
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To evaluate the hypothesis that EMP level is a predictive biomarker for mortality in sepsis.
For the secondary objective, EMP levels will be measured on admission and daily for the first 5 ICU days or until the subject dies or leaves the ICU.
While data will be collected prospectively on all subjects, the cohort for analysis for this objective will include only those subjects with a validated diagnosis of sepsis.
In these subjects, 30-day mortality will be ascertained, and EMP levels correlated with mortality to determine the utility of EMPs as a biomarker for mortality risk in sepsis.
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30 days
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Collaborators and Investigators
Collaborators
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- 1305013944
- NPRP 6-1348-3-321 (Other Identifier: Qatar National Research Fund)
- 13-00309 (Other Identifier: JIRB)
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
product manufactured in and exported from the U.S.
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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