Sickle Cell Trait and the Risk of Venous Thromboembolism (SCT&DVT)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01148940
Recruitment Status : Terminated (insufficent enrollment)
First Posted : June 23, 2010
Last Update Posted : April 16, 2015
Information provided by (Responsible Party):
Henny Billett, Albert Einstein College of Medicine of Yeshiva University

June 21, 2010
June 23, 2010
April 16, 2015
July 2010
December 2011   (Final data collection date for primary outcome measure)
To investigate whether D-Dimer levels differ in black peripartum women with SCT than in black women with Hb AA and white women with Hb AA. [ Time Frame: One year ]
The primary outcome measure will be D-Dimer measured on a continuous scale. We will compare mean D-Dimer of Black SCT women, Black AA women and White AA women using an independent samples t tests if normality assumptions are met and Mann-Whitney test of mean ranks if not. We will use a one-sided, non-inferiority test of
Same as current
Complete list of historical versions of study NCT01148940 on Archive Site
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Thromboprophylaxis for peripartum SCT [ Time Frame: 3 years ]
If there is evidence of an increased risk of thrombosis, we will investigate whether therapeutic intervention is beneficial by planning a trial of prophylactic anticoagulation during the peripartum period for women with SCT.
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Sickle Cell Trait and the Risk of Venous Thromboembolism
Sickle Cell Trait and the Risk of Venous Thromboembolism
The purpose of this trial is to investigate D-Dimer levels, a surrogate marker of venous thromboembolism, in pregnant/postpartum white women as compared to pregnant/postpartum black women, and pregnant/postpartum women with sickle cell trait. The investigators will determine whether increased D-Dimer levels are reflected in a greater incidence of thrombosis in the postpartum patient, as well as the prevalence of symptomatic venous thrombosis in black patients as compared to pregnant white patients and women with sickle cell trait. The investigators will also investigate the effect of blood group on these parameters. If there is evidence that there is an increased risk of thrombosis in sickle cell trait, the investigators will plan a trial of prophylactic anticoagulation during the last trimester and the four weeks post partum for patients with sickle cell trait and compare this population to patients who do not receive prophylactic anticoagulation.

Venous thromboembolism is the major cause of maternal mortality in the United States and there are emerging data that the thrombotic risk is higher in peripartum black women as compared to white women. The reasons are unclear: indeed, the few genetic risk factors for venous thrombosis that have been identified are more common in whites than blacks. This raises the possibility of yet undescribed mutations. To bolster this theory, some intriguing studies have noted a similar frequency of 'familial' thrombosis in blacks and whites, supporting the existence of yet unidentified hereditary component(s). Sickle cell anemia is a genetic disease more prevalent in the black population. Whereas sickle cell anemia has been associated with a prothrombotic state, there are limited data to support a prothrombotic state in sickle cell trait. We plan to examine whether sickle cell trait might play a role in increasing the incidence of thrombosis in the black population.

Peripartum women are 4-5 times more likely to develop venous thrombosis. Scant literature exists on the thrombotic risk in women from different races in the peripartum period and there are no studies evaluating venous thrombosis risk in sickle cell trait women during this time of increased thrombogenicity. In a retrospective analysis of deliveries of 12,000 women at Einstein/Montefiore, a higher incidence of venous thrombosis in black peripartum women was observed and, among the black population, a trend for sickle cell trait women to be at higher risk compared to black women with the normal hemoglobin (Hb) AA.

Given the medical importance and financial/sociological impact of venous thrombosis, it is important to determine whether black women, and specifically black women with sickle cell trait, are really at increased risk for thromboembolic disease during the peripartum period and, if so, what intervention(s) might mitigate this risk. We propose to perform a prospective study investigating peripartum white Hb AA, black Hb AA, and black sickle cell trait women by assessing D-Dimer levels. The D-Dimer levels will be assayed at defined times during the peripartum and correlated with pregnancy complications, as well as neonatal and birth data, thrombosis and, in selected cases, lower extremity duplex ultrasonography. If, after analysis, there is evidence confirming an increased thrombotic risk, we will design and institute an interventional trial. The purpose of this application is to fill in the gaps of current knowledge regarding the role of race in venous thromboembolism, to test different methodologies for studying this significant health problem, and to lay the groundwork for clinical trial development to determine whether therapeutic intervention with prophylactic anticoagulation is beneficial during the peripartum period for patients with sickle cell trait.

Observational Model: Cohort
Time Perspective: Prospective
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Probability Sample
Pregnant and postpartum women
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*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
March 2014
December 2011   (Final data collection date for primary outcome measure)

Inclusion Criteria:

  • Peripartum women (White, Black) with Hemoglobin AA or AS

Exclusion Criteria:

  • Hispanic ethnicity
Sexes Eligible for Study: Female
18 Years to 50 Years   (Adult)
Contact information is only displayed when the study is recruiting subjects
United States
2009-539 ( Other Identifier: IRB No. )
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Henny Billett, Albert Einstein College of Medicine of Yeshiva University
Albert Einstein College of Medicine, Inc.
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Principal Investigator: Henny H Billett, MD MSc Albert Einstein College of Medicine/Montefiore Medical Ctr
Albert Einstein College of Medicine, Inc.
April 2015