Thrombomodulin-modified Thrombin Generation Assay (TGA-TM) in Patients With Critical Infections

March 22, 2021 updated by: Lukas Infanger, Medical University of Vienna

Coagulation Assays in the Critically Ill Patient: a New Approach Using the Thrombomodulin-modified Thrombin Generation Assay (TGA-TM)

Inflammation and abnormalities in laboratory coagulation tests are inseparably tied. For example, coagulation abnormalities are nearly universal in septic patients. Coagulation disorders have also been reported in many patients with severe courses of Coronavirus disease 2019 (Covid-19). But it is difficult to assess these changes. Global coagulation tests have been shown to incorrectly assess in vivo coagulation in patients admitted to intensive care units. But other tests are available. Thrombin generation assay (TGA) is a laboratory test which allows the assessment of an individual's potential to generate thrombin. But also in conventional TGA the protein C system is hardly activated because of the absence of endothelial cells (containing natural thrombomodulin) in the plasma sample. Therefore the investigators add recombinant human thrombomodulin to a conventional TGA. Thereby the investigators hope to be able to depict in vivo coagulation more closely than global coagulation tests do.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Observational

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
58

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Austria
      • Vienna, Austria, 1090
        • Medical University Vienna

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Sampling Method

Non-Probability Sample

Study Population

60 critically ill patients with signs of infection with SARS-CoV2 or proven infection with SARS-CoV-2 admitted to Intensive Care Units (ICU).

Description

Inclusion Criteria:

  • Admission to ICU
  • Clinical signs of infection with SARS-CoV-2 or already diagnosed infection with SARS-CoV-2
  • Neutrophil-Lymphocyte Ratio (NLR) >3

Exclusion Criteria:

  • Intake of oral anticoagulants or any kind of parenteral therapeutic anticoagulation prior to ICU admission
  • Congenital coagulation disorder
  • Treatment with Prothrombin complex concentrate (F. II, VII, IX, X) or activated Prothrombin complex within past 48 hours
  • Treatment with recombinant factor VIIa (e.g. eptacog alfa) within past 48 hours
  • Treatment with recombinant protein C within past 48 hours
  • Active bleeding
  • Acute myocardial infarction
  • HIV infection
  • Chronic pancreatitis
  • Liver cirrhosis

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Observational Models: Cohort
  • Time Perspectives: Prospective

Cohorts and Interventions

Group / Cohort

Group / Cohort

A group or subgroup of participants in an observational study that is assessed for biomedical or health outcomes.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Critical infection
Patients with signs of infection with SARS-CoV-2 or already diagnosed infection with SARS-CoV-2 admitted to the ICU
Diagnostic test: Thrombin Generation Assay (TGA)
TGA via a fluorimetric module. Coagulation cascade is activated upon addition of different concentrations of tissue factor and phospholipids. The fluorogenic substrate Z-Gly-Gly-Arg-AMC (ZGGR-AMC) is cleaved by formed thrombin over time. By plotting the changes in fluorescence as a function of time (cnt/min), it depicts the "Thrombin Generation Curve" (thrombin generated - plotted against time). The area under the thrombin curve is defined as the endogenous thrombin potential (ETP).
Diagnostic test: Thrombomodulin Modified Thrombin Generation Assay (TGA-TM)
Recombinant Human Thrombomodulin (TM) is added to the conventional TGA. When recombinant TM is added, the protein C system is fully activated and therefore the ETP obtained reflects both the anti- and procoagulant factors.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
ETP (AUC) without rhThrombomodulin (rhTM)
Time Frame: 6 months
nM;
6 months
ETP (AUC) with rhThrombomodulin (rhTM)
Time Frame: 6 months
nM;
6 months
ETP-ratio
Time Frame: 6 months
Ratio of endogenous thrombin potential (ETP) with rhTM to ETP without rhTM
6 months
ETP-Normalisation
Time Frame: 6 months
Comparison of ETP-ratios from ICU patients and ETP-ratios from citrated plasma samples from healthy donors
6 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Medical University of Vienna

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
Medical Scientific Fund of the Mayor of Vienna

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
April 15, 2020

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
February 1, 2021

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
February 1, 2021

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
April 15, 2020

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
April 18, 2020

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
April 22, 2020

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
March 23, 2021

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
March 22, 2021

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
March 1, 2021

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • TGA-TM-Critical-2019

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

Undecided

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

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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