Deep Vein ThrombosisEarly Phase 1NCT03516656
Evaluation of Anti-Xa Levels in Surgery Patients Receiving Weight-based Heparin
A Early Phase 1 study testing Standard heparin dose and Real time heparin dose adjustment in people with Deep Vein Thrombosis and Pulmonary Embolism, run by University of Utah at 1 site in United States.
Trial summary
The purpose of this study is to determine if weight-based heparin infusions at a rate of 10 units/kg/hour are sufficient to maintain a target anti-Xa of 0.1-0.35 IU/mL for VTE prophylaxis in patients undergoing microvascular surgery. Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Deep Vein Thrombosis, Pulmonary Embolism, Venous Thromboembolism
- What is being tested?
- Standard heparin dose and Real time heparin dose adjustment
- Type of treatment
- Injection or infusion
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 20 participants
- Where
- 1 siteUnited States
- Study dates
- 23 Mar 2018to 24 Aug 2021
- Phase
- Early Phase 1
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Patients undergoing surgical procedures
- Initiation of a heparin infusion at a rate of 500 units/hour intraoperatively or postoperatively
Who cannot join
- Age <18 years old
- Pregnant
- Incarcerated
- Mentally disabled
Trial locations and contacts
1 site in 1 country.
About this study
The purpose of this study is to determine if weight-based heparin infusions at a rate of 10 units/kg/hour are sufficient to maintain a target anti-Xa of 0.1-0.35 IU/mL for VTE prophylaxis in patients undergoing microvascular surgery. Additionally, a pilot protocol has been developed to titrate these heparin infusions to ensure patients have sufficient VTE prophylaxis. All patients will be enrolled in the observational arm of the study and receive anti-Xa level monitoring. Patients with out-of-range anti-Xa levels will cross over to the interventional arm of the study and receive real time heparin infusion dose adjustments per the pilot protocol. The primary outcome measured will be the percentage of patients with anti-Xa levels in the target range of 0.1-0.35 IU/mL while on a heparin infusion at 10 units/kg/hour.
- Being tested
- Standard heparin dose, Real time heparin dose adjustment
- Medical subject headings
- Venous Thrombosis, Pulmonary Embolism, Venous Thromboembolism
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Standard heparin doseDrug
Patients will be placed on heparin infusions per their surgeon's discretion.
Real time heparin dose adjustmentDrug
Patients will have steady state anti-Xa levels drawn at least 6 hours after initiation of heparin infusion. Patients with out of range anti-Xa levels will receive real time heparin dose adjustment followed by repeat anti-Xa levels.
| Study group | Role | What they receive |
|---|---|---|
| Standard heparin dose | Active comparator | The investigators will identify surgical patients placed on fixed dose heparin infusions at their attending surgeon's discretion-the proposed research will not dictate the initiation of the heparin drip intraoperatively. However, the investigators will identify patients already on heparin, evaluate steady state heparin anti-Xa levels and adjust patient's dose if necessary based on steady state anti-Xa levels. Eligible patients will be started on heparin fixed-dose intraoperatively and transitioned to a weight-based dose by their surgeons. Steady state anti-Xa levels will be drawn at least 6 hours after initiation of heparin infusion. Goal anti-Xa levels will be 0.1-0.35 IU/mL. Receives: Drug: Standard heparin dose |
| Real time heparin dose adjustment | Active comparator | Patients with identified out of range levels will receive pharmacist-driven real time heparin dose adjustment and will receive follow-up steady state anti-Xa levels. Anti-Xa level monitoring will be discontinued when in range peak levels are obtained, when heparin infusions are discontinued at surgeon discretion, or when the patient is discharged Receives: Drug: Real time heparin dose adjustment |
What is being measured
The primary outcome is the main question the study is designed to answer.
Percentage of Anti-Xa Levels Within Target Range (0.1-0.35 IU/mL)
Measured: Through study completion, an average of 1 year
Secondary outcomes (1)
Number of Rate Adjustments
Measured: Through study completion, an average of 1 year
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted4 May 2018
- Study start23 Mar 2018
- Primary completion30 Jun 2019
- Study completion24 Aug 2021
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Deep Vein ThrombosisStudies of the same condition, open and under way.
- More trials run by University of UtahThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Early Phase 1
- Primary purpose
- Prevention
- Allocation
- Non-randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Enrolment
- 20 participants (actual)
Sponsor and investigators
- Lead sponsor
- University of Utah
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
- Investigators
- Anne Prazak, PharmD, Principal investigator, University of Utah
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT03516656
- Sponsor's protocol ID
- IRB_00107294
- Status last verified
- Nov 2020
- First submitted
- 24 Apr 2018
- Last updated
- 17 May 2023
- Results posted
- No
- Data monitoring committee
- Yes
- FDA-regulated drug
- Yes
- FDA-regulated device
- No
Study at a glance
From the registry record, last updated by the sponsor on 17 May 2023. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Evaluation of Anti-Xa Levels in Surgery Patients Receiving Weight-based Heparin
- ClinicalTrials.gov ID
- NCT03516656
- Acronym / sponsor ID
- IRB_00107294
- Phase
- Early Phase 1
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 20 participants (actual)
- Lead sponsor
- University of UtahUniversity, hospital or other
- Study start
- 23 Mar 2018 (actual)
- Primary completion
- 30 Jun 2019 (actual)
- Study completion
- 24 Aug 2021 (actual)
- First posted
- 4 May 2018 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The purpose of this study is to determine if weight-based heparin infusions at a rate of 10 units/kg/hour are sufficient to maintain a target anti-Xa of 0.1-0.35 IU/mL for VTE prophylaxis in patients undergoing microvascular surgery. Additionally, a pilot protocol has been developed to titrate these heparin infusions to ensure patients have sufficient VTE prophylaxis. All patients will be enrolled in the observational arm of the study and receive anti-Xa level monitoring. Patients with out-of-range anti-Xa levels will cross over to the interventional arm of the study and receive real time heparin infusion dose adjustments per the pilot protocol. The primary outcome measured will be the percentage of patients with anti-Xa levels in the target range of 0.1-0.35 IU/mL while on a heparin infusion at 10 units/kg/hour.
Study design
- Primary purpose
- Prevention
- Allocation
- Non-randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Standard heparin dose | Active comparator | Drug: Standard heparin doseThe investigators will identify surgical patients placed on fixed dose heparin infusions at their attending surgeon's discretion-the proposed research will not dictate the initiation of the heparin drip intraoperatively. However, the investigators will identify patients already on heparin, evaluate steady state heparin anti-Xa levels and adjust patient's dose if necessary based on steady state anti-Xa levels. Eligible patients will be started on heparin fixed-dose intraoperatively and transitioned to a weight-based dose by their surgeons. Steady state anti-Xa levels will be drawn at least 6 hours after initiation of heparin infusion. Goal anti-Xa levels will be 0.1-0.35 IU/mL. |
| Real time heparin dose adjustment | Active comparator | Drug: Real time heparin dose adjustmentPatients with identified out of range levels will receive pharmacist-driven real time heparin dose adjustment and will receive follow-up steady state anti-Xa levels. Anti-Xa level monitoring will be discontinued when in range peak levels are obtained, when heparin infusions are discontinued at surgeon discretion, or when the patient is discharged |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (2 listed)
- Patients undergoing surgical procedures
- Initiation of a heparin infusion at a rate of 500 units/hour intraoperatively or postoperatively
Key exclusion criteria (4 listed)
- Age <18 years old
- Pregnant
- Incarcerated
- Mentally disabled
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Standard heparin dosePatients will be placed on heparin infusions per their surgeon's discretion. | Drug | Standard heparin dose |
| Real time heparin dose adjustmentPatients will have steady state anti-Xa levels drawn at least 6 hours after initiation of heparin infusion. Patients with out of range anti-Xa levels will receive real time heparin dose adjustment followed by repeat anti-Xa levels. | Drug | Real time heparin dose adjustment |
Primary outcome
Percentage of Anti-Xa Levels Within Target Range (0.1-0.35 IU/mL)
Time frame: Through study completion, an average of 1 year
1 secondary outcome
Number of Rate Adjustments
Time frame: Through study completion, an average of 1 year
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 17 May 2023.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Anne Prazak, PharmD principal investigator
University of Utah
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Early Phase 1 study testing Standard heparin dose and Real time heparin dose adjustment in people with Deep Vein Thrombosis and Pulmonary Embolism, run by University of Utah at 1 site in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 2 inclusion and 4 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 17 May 2023. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this phase mean?
Early Phase 1 (sometimes called Phase 0) studies give a very small amount of a treatment to a few people, mainly to see how the body handles it.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Percentage of Anti-Xa Levels Within Target Range (0.1-0.35 IU/mL) (time frame: Through study completion, an average of 1 year). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 17 May 2023.