Endothelial Protection in Convalescent COVID-19 Patients

June 11, 2025 updated by: Pirogov Russian National Research Medical University

Endothelial Protection in Convalescent COVID-19 Patients. The Effect of Sulodexide on Serum Levels of Biomarkers for Endothelial Dysfunction. A Pilot Prospective, Randomized, Open-label, Investigator-initiated Trial.

This pilot open-label randomized controlled trial aims to assess if treatment with sulodexide may improve the endothelial status and inflammatory response in post-COVID-19 patients. Survived inpatients with severe-to-critical COVID-19 within 14 days after discharge are randomized to receive sulodexide 250 LSU 1 oral capsule twice daily or no treatment for 8 weeks. Biomarkers of endothelial dysfunction, inflammation, and prothrombotic changes are assessed at 0, 4, and 8 weeks. The hypothesis is that affected endothelial function, pro-inflammatory, and pro-thrombotic changes could be improved with sulodexide treatment in convalescent COVID-19 patients who suffered a severe-to-critical clinical presentation and have chronic comorbidities of high risk for endothelial dysfunction.

Study Overview

Status

Status

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

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.
Interventional

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.
2

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 4

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

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

Description

Inclusion Criteria:

  • over 18 years old
  • male or female
  • documented PCR SARS-CoV-2 positive test
  • COVID-19 convalescence (define as at least 10 days after the onset of symptoms, no fever for at least 24 hours without the use of antipyretics and improvement of respiratory symptoms)
  • informed consent signed

  • clinical severity presentation of

    1. Severe the disease is classified as severe if one of the following conditions is met:

      Respiratory distress, respiratory rate ≥30/min Oxygen saturation on room air at rest ≤93%. Partial pressure of oxygen in arterial blood/FiO2 ≤300 mm Hg. Or

    2. Critical if one of the following conditions is met. Respiratory failure and mechanical ventilation are required. Shock occurs Another organ dysfunction is present
  • risk of health complication >50% according to the health risk calculator
  • less than 14 days of hospital discharge.

Exclusion Criteria:

  • concomitant use of another anticoagulant
  • known pregnancy
  • known hypersensitivity to sulodexide
  • need for hospital care at screening
  • renal insufficiency with CrCl <30ml/min or continuous renal replacement therapy, hemodialysis, or peritoneal dialysis.
  • blood platelet count < 30 000/µL
  • other conditions that are judged to carry an increased risk of bleeding as judged by the Investigator
  • more than 30 days of clinical onset

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

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Single

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
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.
Experimental: Sulodexide
Standard treatment plus oral sulodexide
Drug: Sulodexide
Sulodexide 250 LSU 1 oral capsule twice daily for 8 weeks
No Intervention: Control
Standard treatment only

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
Serum level of soluble Thrombomodulin
Time Frame: 8 weeks
The level of serum soluble Thrombomodulin will be measured at 0, 4, and 8 weeks by ELISA test to detect endothelial dysfunction and its improvement.
8 weeks

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Serum level of Von Willebrand factor
Time Frame: 8 weeks
The level of serum Von Willebrand factor will be measured at 0, and 8 weeks by ELISA test to detect pro-thrombotic status, endothelial dysfunction, and their improvement.
8 weeks
Serum level of ICAM-1
Time Frame: 8 weeks
The level of serum ICAM-1 will be measured at 0, and 8 weeks by ELISA test to detect pro-inflammatory status, endothelial dysfunction, and their improvement.
8 weeks
Serum level of VCAM-1
Time Frame: 8 weeks
The level of serum VCAM-1 will be measured at 0, and 8 weeks by ELISA test to detect pro-inflammatory status, endothelial dysfunction, and their improvement.
8 weeks
Serum level of soluble P-selectin
Time Frame: 8 weeks
The level of serum soluble P-selectin will be measured at 0, and 8 weeks by ELISA test to detect pro-inflammatory status, pro-thrombotic changes, endothelial dysfunction, and their improvement.
8 weeks
Serum level of circulating endothelial cells
Time Frame: 8 weeks
The level of circulating endothelial cells will be measured at 0, and 8 weeks by standardized flow cytometry to detect endothelial dysfunction and its improvement
8 weeks
Serum level of high sensitive C reactive protein
Time Frame: 8 weeks
The level of high sensitive C reactive protein will be measured at 0, and 8 weeks by ELISA test to detect pro-inflammatory status, endothelial dysfunction, and their improvement.
8 weeks
Serum level of Interleukine-6
Time Frame: 8 weeks
The level of serum Interleukine-6 will be measured at 0, and 8 weeks by ELISA test to detect pro-inflammatory status, endothelial dysfunction, and their improvement.
8 weeks

Other Outcome Measures

Other Outcome Measures

For clinical trials, a planned measurement described in the protocol that is used to determine the effect of an intervention/treatment on participants. For observational studies, a measurement or observation that is used to describe patterns of diseases or traits, or associations with exposures, risk factors, or treatment. Types of outcome measures include primary outcome measure and secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Serum level of D-dimer
Time Frame: 8 weeks
The level of serum D-dimer will be measured at 0, 4, and 8 weeks by ELISA test to detect pro-inflammatory status, pro-thrombotic changes, endothelial dysfunction, and their improvement.
8 weeks
Serum level of fibrinogen
Time Frame: 8 weeks
The level of serum fibrinogen will be measured at 0, 4, and 8 weeks by ELISA test to detect pro-inflammatory status, pro-thrombotic changes, endothelial dysfunction, and their improvement.
8 weeks
Platelets count in peripheral blood
Time Frame: 8 weeks
Platelets count in peripheral blood will be measured at 0, 4, and 8 weeks by standard automatic analyzer for complete blood count to detect pro-inflammatory status, pro-thrombotic changes, endothelial dysfunction, and their improvement.
8 weeks
Post-COVID-19 functional status
Time Frame: 8 weeks
Post-COVID-19 functional status will be assessed at 0, 4, and 8 weeks by a specific questionnaire "Post-COVID-19 Functional Status (PCFS)" scale that ranges from 0 (no limitations) to 4 (severe limitations).
8 weeks
Clinical progression of COVID-19
Time Frame: 8 weeks
Clinical progression of COVID-19 will be assessed at 0, 4, and 8 weeks by a specific World Health Organization Clinical progression scale that ranges from 0 (no infection) to 10 (death due to infection).
8 weeks
Thrombotic complications
Time Frame: 8 weeks
Venous (deep vein thrombosis, superficial vein thrombosis, pulmonary embolism) and arterial (myocardial infarction, stroke, acute limb ischemia) thrombosis will be assessed on a clinical basis and should be confirmed by appropriate imaging (duplex ultrasound scan, computed tomography scan with contrast, arterial and venous angiography).
8 weeks
Major bleeding as defined by International Society on Thrombosis and Haemostasis (ISTH) criteria
Time Frame: 8 weeks
Major bleeding as defined by the International Society on Thrombosis and Haemostasis (fatal bleeding, and/or symptomatic bleeding in a critical area or organ, such as intracranial, intraspinal, intraocular, retroperitoneal, intraarticular or pericardial, or intramuscular with compartment syndrome, and/or bleeding causing a fall in hemoglobin level of 2 g/dL (1.24 mmol/L) or more, or leading to transfusion of two or more units of whole blood or red cells) will be assessed on a clinical basis and should be confirmed by appropriate laboratory and instrumental tests.
8 weeks
Clinically relevant non-major bleedingas defined by International Society on Thrombosis and Haemostasis (ISTH) criteria
Time Frame: 8 weeks
Clinically relevant non-major bleeding as defined by the International Society on Thrombosis and Haemostasis (requiring medical intervention by a healthcare professional, and/or leading to hospitalization, and/or increased level of care prompting a face to face [i.e., not just a telephone or electronic communication] evaluation) will be assessed on a clinical basis and should be confirmed by appropriate laboratory and instrumental tests.
8 weeks

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.
Pirogov Russian National Research Medical University

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Kirill Lobastov, PhD, Pirogov Russian National Research Medical University

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 1, 2022

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.
September 1, 2022

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.
December 31, 2022

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).
February 21, 2022

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.
February 21, 2022

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.
February 23, 2022

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.
June 13, 2025

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.
June 11, 2025

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.
January 1, 2025

More Information

Terms related to this study

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.
  • SDXbioCOVID-19

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

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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