HyperfibrinolysisNCT02579941
Evaluation of the Minimum Concentration of Tranexamic Acid Required to Inhibit Fibrinolysis in a Population of Pregnant Women at Term.
A study testing Blood sampling (pregnant) and Blood sampling (non pregnant) in people with Hyperfibrinolysis, run by Brugmann University Hospital at 1 site in Belgium.
Trial summary
Pregnancy induces a physiological change of hemostasis to a prothrombotic state : protein S decrease and increase of virtually all the clotting factors, in particular fibrinogen, von Willebrand factor and factor VIII. Read more about this study
- Who is it for?
- Ages 18 years and older, women onlyHealthy volunteers can take part
- Conditions the study is for
- Hyperfibrinolysis
- What is being tested?
- Blood sampling (pregnant) and Blood sampling (non pregnant)
- Type of treatment
- Surgery or procedure
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 40 participants
- Where
- 1 siteBelgium
- Study dates
- Nov 2015to Apr 2016
- Phase
- Interventional
- 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
- Women only
- Healthy volunteers accepted
- Adult, Older adult
Who may be able to join
- Pregnant women group:
- pregnant women at term (>37 weeks of gestation)
- patients admitted for delivery or elective cesarian section
- written informed consent
- Healthy volunteers group:
- women aged from 18 to 40
Who cannot join
- Dying patients (ASA 5)
- Jehovah's witnesses
- Patients with pre-eclampsia, HELLP syndrome, placenta previa or placental abruption.
- Multiple pregnancy
- Presence of preoperative coagulation disorders defined as: platelets <150,000 / mm3; PTT <70%; aPTT> 33 sec; fibrinogen <350 mg / dL.
- Treatment with anticoagulant or antiplatelet agent.
Trial locations and contacts
1 site in 1 country.
About this study
Pregnancy induces a physiological change of hemostasis to a prothrombotic state : protein S decrease and increase of virtually all the clotting factors, in particular fibrinogen, von Willebrand factor and factor VIII. However, a state of hyperfibrinolysis may occur in the immediate postpartum period (especially after placental delivery), thereby promoting postpartum hemorrhage.
This state of hyperfibrinolysis is associated with the use of transfusions of blood products and the realization of hysterectomy.It is currently the most common etiology of maternal mortality in childbirth.There is an imperative to develop an efficient and reliable protocol for the management of this postpartum complication.
Tranexamic acid is an anti-fibrinolytic agent (like lysine) which acts by preventing the conversion of plasminogen to plasmin, by blocking the binding of plasminogen to the heavy chain of fibrin.The optimal dose of tranexamic acid enabling to inhibit fibrinolysis without increasing the complications rate remains to be defined. It is in this context that the investigators aim to evaluate, in an in-vitro model, the minimum dose of tranexamic acid required to inhibit fibrinolysis after activation of the latter by t-PA. The degree of fibrinolysis will be evaluated by thromboelastometry.
Read the detailed description
Pregnancy induces a physiological change of hemostasis to a prothrombotic state : protein S decrease and increase of virtually all the clotting factors, in particular fibrinogen, von Willebrand factor and factor VIII. However, a state of hyperfibrinolysis may occur in the immediate postpartum period (especially after placental delivery), thereby promoting postpartum hemorrhage.
This state of hyperfibrinolysis is associated with the use of transfusions of blood products and the realization of hysterectomy.It is currently the most common etiology of maternal mortality in childbirth. Although its incidence is low in western countries, it remains very high in the world.There is an imperative to develop an efficient and reliable protocol for the management of this postpartum complication.
Tranexamic acid is an anti-fibrinolytic agent (like lysine) which acts by preventing the conversion of plasminogen to plasmin, by blocking the binding of plasminogen to the heavy chain of fibrin.The use of this agent has spread in recent years in many types of surgery (cardiac, orthopedic, etc.), and in patient polytrauma. However, the number of studies evaluating its efficacy in the management (treatment and / or prevention) of postpartum hemorrhage is limited. In addition, the doses used are extrapolated from studies of a different population (multiple trauma, cardiac surgery, etc).
The tranexamic acid proposed scheme is currently used is not suitable for the population of pregnant women at term. It was established arbitrarily on the basis of the adult population without considering the physiological and metabolic characteristics of the term pregnancy. The optimal dose of tranexamic acid enabling inhibition of fibrinolysis, without increasing the complications rate, remains thus to be defined.
It is in this context that the investigators aim to evaluate, in an in-vitro model, the minimum dose of tranexamic acid required to inhibit fibrinolysis after activation of the latter by t-PA. The degree of fibrinolysis will be evaluated by thromboelastometry.
- Conditions
- Hyperfibrinolysis
- Being tested
- Blood sampling (pregnant), Blood sampling (non pregnant)
- Keywords
- Hyperfibrinolysis, Pregnant women at term, Tranexamic acid
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Blood sampling (pregnant)Procedure or surgery
5.4 ml of venous blood will be taken during the delivery or the caesarian procedure, in addition to the standard of care blood sampling.
This blood vial will be sent to the coagulation laboratory and all tests will be performed in vitro. The blood sample will be split in several aliquots. In each blood sample, fibrinolysis will be activated by the plasminogen tissular activator (tPA - concentration: 1066 UtPA/ml). Tranexamic acid will be added at increasing concentrations (2.5 microg/ml up to 40 microg/ml) to each sample and coagulation will be measured by two different tests: EXTEM and NATEM.
Blood sampling (non pregnant)Procedure or surgery
5.4 ml of venous blood will be taken.
This blood vial will be sent to the coagulation laboratory and all tests will be performed in vitro. The blood sample will be split in several aliquots. In each blood sample, fibrinolysis will be activated by the plasminogen tissular activator (tPA - concentration: 1066 UtPA/ml). Tranexamic acid will be added at increasing concentrations (2.5 microg/ml up to 40 microg/ml) to each sample and coagulation will be measured by two different tests: EXTEM and NATEM.
| Study group | Role | What they receive |
|---|---|---|
| Pregnant women at term, vaginal childbirth | Experimental | Not described Receives: Procedure: Blood sampling (pregnant) |
| Pregnant women at term, cesarean delivery | Experimental | Not described Receives: Procedure: Blood sampling (pregnant) |
| Female volunteers, age 18 to 40 | Experimental | Not described Receives: Procedure: Blood sampling (non pregnant) |
What is being measured
The primary outcome is the main question the study is designed to answer.
Coagulation (EXTEM)
Coagulation will be tested using the EXTEM test (test evaluating the extrinsic coagulation pathway after its activation by tissue factor)
Measured: within 24h of blood collection
Coagulation (NATEM)
Coagulation will be tested using the NATEM test (test evaluating coagulation after startem addition (for recalcification of citrated blood) and without activator addition)
Measured: within 24h of blood collection
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted20 Oct 2015 (estimated)
- Study startNov 2015
- Primary completionApr 2016
- Study completionApr 2016
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (8)Papers the sponsor has linked to this study.
- Other trials for HyperfibrinolysisStudies of the same condition, open and under way.
- 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
- Phase N/A
- Primary purpose
- Prevention
- Allocation
- Non-randomised
- Intervention model
- Single group
- Masking
- None (open label)
- Enrolment
- 40 participants (actual)
Sponsor and investigators
- Lead sponsor
- Brugmann University Hospital
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Philippe VAN DER LINDEN, Brugmann University Hospital
- Investigators
- Philippe Van der Linden, MD, Principal investigator, CHU BrugmannArnaud Lechien, MD, Principal investigator, CHU Brugmann
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT02579941
- Sponsor's protocol ID
- CHUB-Fibrinolyse
- Status last verified
- Jan 2018
- First submitted
- 16 Oct 2015
- Last updated
- 19 Jan 2018
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
Publications
Cerneca F, Ricci G, Simeone R, Malisano M, Alberico S, Guaschino S. Coagulation and fibrinolysis changes in normal pregnancy. Increased levels of procoagulants and reduced levels of inhibitors during pregnancy induce a hypercoagulable state, combined with a reactive fibrinolysis. Eur J Obstet Gynecol Reprod Biol. 1997 May;73(1):31-6. doi: 10.1016/s0301-2115(97)02734-6.
PubMed 9175686Bonnar J, McNicol GP, Douglas AS. Coagulation and fibrinolytic mechanisms during and after normal childbirth. Br Med J. 1970 Apr 25;2(5703):200-3. doi: 10.1136/bmj.2.5703.200.
PubMed 5443405Brenner B. Haemostatic changes in pregnancy. Thromb Res. 2004;114(5-6):409-14. doi: 10.1016/j.thromres.2004.08.004.
PubMed 15507271Faraoni D, Carlier C, Samama CM, Levy JH, Ducloy-Bouthors AS. [Efficacy and safety of tranexamic acid administration for the prevention and/or the treatment of post-partum haemorrhage: a systematic review with meta-analysis]. Ann Fr Anesth Reanim. 2014 Nov;33(11):563-71. doi: 10.1016/j.annfar.2014.07.748. Epub 2014 Oct 18. French.
PubMed 25450729Sentilhes L, Lasocki S, Ducloy-Bouthors AS, Deruelle P, Dreyfus M, Perrotin F, Goffinet F, Deneux-Tharaux C. Tranexamic acid for the prevention and treatment of postpartum haemorrhage. Br J Anaesth. 2015 Apr;114(4):576-87. doi: 10.1093/bja/aeu448. Epub 2015 Jan 8.
PubMed 25571934Ronsmans C, Graham WJ; Lancet Maternal Survival Series steering group. Maternal mortality: who, when, where, and why. Lancet. 2006 Sep 30;368(9542):1189-200. doi: 10.1016/S0140-6736(06)69380-X.
PubMed 17011946Ortmann E, Besser MW, Klein AA. Antifibrinolytic agents in current anaesthetic practice. Br J Anaesth. 2013 Oct;111(4):549-63. doi: 10.1093/bja/aet154. Epub 2013 May 9.
PubMed 23661406Collis RE, Collins PW. Haemostatic management of obstetric haemorrhage. Anaesthesia. 2015 Jan;70 Suppl 1:78-86, e27-8. doi: 10.1111/anae.12913.
PubMed 25440400
Study at a glance
From the registry record, last updated by the sponsor on 19 Jan 2018. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Evaluation of the Minimum Concentration of Tranexamic Acid Required to Inhibit Fibrinolysis in a Population of Pregnant Women at Term.
- ClinicalTrials.gov ID
- NCT02579941
- Acronym / sponsor ID
- CHUB-Fibrinolyse
- Conditions
- Hyperfibrinolysis
- Keywords
- Hyperfibrinolysis, Pregnant women at term, Tranexamic acid
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 40 participants (actual)
- Lead sponsor
- Brugmann University HospitalUniversity, hospital or other
- Study start
- Nov 2015
- Primary completion
- Apr 2016 (actual)
- Study completion
- Apr 2016 (actual)
- First posted
- 20 Oct 2015 (estimated)
- 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.
Pregnancy induces a physiological change of hemostasis to a prothrombotic state : protein S decrease and increase of virtually all the clotting factors, in particular fibrinogen, von Willebrand factor and factor VIII. However, a state of hyperfibrinolysis may occur in the immediate postpartum period (especially after placental delivery), thereby promoting postpartum hemorrhage.
This state of hyperfibrinolysis is associated with the use of transfusions of blood products and the realization of hysterectomy.It is currently the most common etiology of maternal mortality in childbirth.There is an imperative to develop an efficient and reliable protocol for the management of this postpartum complication.
Tranexamic acid is an anti-fibrinolytic agent (like lysine) which acts by preventing the conversion of plasminogen to plasmin, by blocking the binding of plasminogen to the heavy chain of fibrin.The optimal dose of tranexamic acid enabling to inhibit fibrinolysis without increasing the complications rate remains to be defined. It is in this context that the investigators aim to evaluate, in an in-vitro model, the minimum dose of tranexamic acid required to inhibit fibrinolysis after activation of the latter by t-PA. The degree of fibrinolysis will be evaluated by thromboelastometry.
Detailed description
Pregnancy induces a physiological change of hemostasis to a prothrombotic state : protein S decrease and increase of virtually all the clotting factors, in particular fibrinogen, von Willebrand factor and factor VIII. However, a state of hyperfibrinolysis may occur in the immediate postpartum period (especially after placental delivery), thereby promoting postpartum hemorrhage.
This state of hyperfibrinolysis is associated with the use of transfusions of blood products and the realization of hysterectomy.It is currently the most common etiology of maternal mortality in childbirth. Although its incidence is low in western countries, it remains very high in the world.There is an imperative to develop an efficient and reliable protocol for the management of this postpartum complication.
Tranexamic acid is an anti-fibrinolytic agent (like lysine) which acts by preventing the conversion of plasminogen to plasmin, by blocking the binding of plasminogen to the heavy chain of fibrin.The use of this agent has spread in recent years in many types of surgery (cardiac, orthopedic, etc.), and in patient polytrauma. However, the number of studies evaluating its efficacy in the management (treatment and / or prevention) of postpartum hemorrhage is limited. In addition, the doses used are extrapolated from studies of a different population (multiple trauma, cardiac surgery, etc).
The tranexamic acid proposed scheme is currently used is not suitable for the population of pregnant women at term. It was established arbitrarily on the basis of the adult population without considering the physiological and metabolic characteristics of the term pregnancy. The optimal dose of tranexamic acid enabling inhibition of fibrinolysis, without increasing the complications rate, remains thus to be defined.
It is in this context that the investigators aim to evaluate, in an in-vitro model, the minimum dose of tranexamic acid required to inhibit fibrinolysis after activation of the latter by t-PA. The degree of fibrinolysis will be evaluated by thromboelastometry.
Study design
- Primary purpose
- Prevention
- Allocation
- Non-randomised
- Intervention model
- Single group
- Masking
- None (open label)
- Number of arms
- 3
| Arm | Type | Receives |
|---|---|---|
| Pregnant women at term, vaginal childbirth | Experimental | Procedure: Blood sampling (pregnant) |
| Pregnant women at term, cesarean delivery | Experimental | Procedure: Blood sampling (pregnant) |
| Female volunteers, age 18 to 40 | Experimental | Procedure: Blood sampling (non pregnant) |
Who may qualify
- Ages
- 18 years and older
- Sex
- Female only
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (6 listed)
- pregnant women at term (>37 weeks of gestation)
- patients admitted for delivery or elective cesarian section
- written informed consent
- women aged from 18 to 40
Key exclusion criteria (6 listed)
- Dying patients (ASA 5)
- Jehovah's witnesses
- Patients with pre-eclampsia, HELLP syndrome, placenta previa or placental abruption.
- Multiple pregnancy
- Presence of preoperative coagulation disorders defined as: platelets <150,000 / mm3; PTT <70%; aPTT> 33 sec; fibrinogen <350 mg / dL.
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 |
|---|---|---|
| Blood sampling (pregnant)5.4 ml of venous blood will be taken during the delivery or the caesarian procedure, in addition to the standard of care blood sampling. This blood vial will be sent to the coagulation laboratory and all tests will be performed in vitro. The blood sample will be split in several aliquots. In each blood sample, fibrinolysis will be activated by the plasminogen tissular activator (tPA - concentration: 1066 UtPA/ml). Tranexamic acid will be added at increasing concentrations (2.5 microg/ml up to 40 microg/ml) to each sample and coagulation will be measured by two different tests: EXTEM and NATEM. | Procedure or surgery | Pregnant women at term, cesarean delivery, Pregnant women at term, vaginal childbirth |
| Blood sampling (non pregnant)5.4 ml of venous blood will be taken. This blood vial will be sent to the coagulation laboratory and all tests will be performed in vitro. The blood sample will be split in several aliquots. In each blood sample, fibrinolysis will be activated by the plasminogen tissular activator (tPA - concentration: 1066 UtPA/ml). Tranexamic acid will be added at increasing concentrations (2.5 microg/ml up to 40 microg/ml) to each sample and coagulation will be measured by two different tests: EXTEM and NATEM. | Procedure or surgery | Female volunteers, age 18 to 40 |
Primary outcome
Coagulation (EXTEM)
Time frame: within 24h of blood collection
Coagulation will be tested using the EXTEM test (test evaluating the extrinsic coagulation pathway after its activation by tissue factor)
Coagulation (NATEM)
Time frame: within 24h of blood collection
Coagulation will be tested using the NATEM test (test evaluating coagulation after startem addition (for recalcification of citrated blood) and without activator addition)
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 19 Jan 2018.
- Background: PubMed 9175686Cerneca F, Ricci G, Simeone R, Malisano M, Alberico S, Guaschino S. Coagulation and fibrinolysis changes in normal pregnancy. Increased levels of procoagulants and reduced levels of inhibitors during pregnancy induce a hypercoagulable state, combined with a reactive fibrinolysis. Eur J Obstet Gynecol Reprod Biol. 1997 May;73(1):31-6. doi: 10.1016/s0301-2115(97)02734-6.
- Background: PubMed 5443405Bonnar J, McNicol GP, Douglas AS. Coagulation and fibrinolytic mechanisms during and after normal childbirth. Br Med J. 1970 Apr 25;2(5703):200-3. doi: 10.1136/bmj.2.5703.200.
- Background: PubMed 15507271Brenner B. Haemostatic changes in pregnancy. Thromb Res. 2004;114(5-6):409-14. doi: 10.1016/j.thromres.2004.08.004.
- Background: PubMed 25450729Faraoni D, Carlier C, Samama CM, Levy JH, Ducloy-Bouthors AS. [Efficacy and safety of tranexamic acid administration for the prevention and/or the treatment of post-partum haemorrhage: a systematic review with meta-analysis]. Ann Fr Anesth Reanim. 2014 Nov;33(11):563-71. doi: 10.1016/j.annfar.2014.07.748. Epub 2014 Oct 18. French.
- Background: PubMed 25571934Sentilhes L, Lasocki S, Ducloy-Bouthors AS, Deruelle P, Dreyfus M, Perrotin F, Goffinet F, Deneux-Tharaux C. Tranexamic acid for the prevention and treatment of postpartum haemorrhage. Br J Anaesth. 2015 Apr;114(4):576-87. doi: 10.1093/bja/aeu448. Epub 2015 Jan 8.
- Background: PubMed 17011946Ronsmans C, Graham WJ; Lancet Maternal Survival Series steering group. Maternal mortality: who, when, where, and why. Lancet. 2006 Sep 30;368(9542):1189-200. doi: 10.1016/S0140-6736(06)69380-X.
- Background: PubMed 23661406Ortmann E, Besser MW, Klein AA. Antifibrinolytic agents in current anaesthetic practice. Br J Anaesth. 2013 Oct;111(4):549-63. doi: 10.1093/bja/aet154. Epub 2013 May 9.
- Background: PubMed 25440400Collis RE, Collins PW. Haemostatic management of obstetric haemorrhage. Anaesthesia. 2015 Jan;70 Suppl 1:78-86, e27-8. doi: 10.1111/anae.12913.
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.
Philippe Van der Linden, MD principal investigator
CHU Brugmann
Arnaud Lechien, MD principal investigator
CHU Brugmann
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Blood sampling (pregnant) and Blood sampling (non pregnant) in people with Hyperfibrinolysis, run by Brugmann University Hospital at 1 site in Belgium.
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 6 inclusion and 6 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 19 Jan 2018. 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 Belgium. 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.
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?
Coagulation (EXTEM) (time frame: within 24h of blood collection). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT02579941, which also lists 8 linked publications.
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 19 Jan 2018.