Venous Thromboembolism in Pregnancy Study (VIP)

This study is currently recruiting participants. (see Contacts and Locations)
Verified March 2009 by Oslo University Hospital
Information provided by (Responsible Party):
Oslo University Hospital Identifier:
First received: March 4, 2009
Last updated: October 17, 2011
Last verified: March 2009

The purpose of this study is to investigate clinical, biochemical and genetic risk factors for venous thromboembolism in pregnancy and pregnancy related vascular complications, and the long-term outcome of such complications including implications for quality of life.

Venous Thromboembolism
Intrauterine Fetal Death

Study Type: Observational
Study Design: Observational Model: Case Control
Time Perspective: Retrospective
Official Title: Venous Thromboembolism and Intrauterine Fetal Death in Pregnancy - Epidemiology and Pathogenic Mechanisms

Resource links provided by NLM:

Further study details as provided by Oslo University Hospital:

Biospecimen Retention:   Samples With DNA

Serum, EDTA and citrated plasma, whole blood and processed DNA

Estimated Enrollment: 1200
Study Start Date: January 2005
Estimated Study Completion Date: December 2023
Primary Completion Date: December 2010 (Final data collection date for primary outcome measure)
VTE case group 1/2
Women with first time venous thromboembolism in pregnancy. VTE data validated from medical records.
VTE control group 1
All pregnancies of source population - clinical data from the Norwegian Birth Registry and the Norwegian Patient Registry.
VTE control group 2
Randomly drawn from group 1 (using the Norwegian Birth Registry), but matched for time of delivery. Without history of venous thromboembolism, and with validated data from medical records.
VTE case group 3
Subjects from VTE case group 1/2 invited to meet for investigation, donation of biological material and to answer a questionnaire.
VTE control group 3
Subjects from VTE control group 2 invited to meet for investigation, donation of biological material and to answer a questionnaire.
IUFD group 1
Women who have experienced IUFD - data verified from medical records.
IUFD group 2
Subjects from IUFD group 2 invited to meet for investigation, donation of biological material and to answer a questionnaire.
IUFD control group 1
All pregnancies of source population - clinical data from the Norwegian Birth Registry and the Norwegian Patient Registry.
IUFD control group 2
Subjects from VTE control group 1/2 with validated data from medical records.
IUFD control group 3
Subjects from VTE control group 3 invited to answer a disease specific questionnaire for IUFD.

Detailed Description:

Background: Venous thromboembolism (VTE) in pregnancy is a serious, but rare condition. There is no epidemiological data on this patient group from Norway, and there is generally little literature on the immediate and long-term outcome after such pregnancies. Approximately 50% of the women with VTE in pregnancy have known thrombophilia. These women also carry a considerably increased risk for intrauterine fetal death (IUFD). In this project we want to identify new thrombophilias as risk factors for VTE and IUFD in pregnancy.


Using a case-control design we will investigate the following issues:

  • Risk factors for VTE in pregnancy and IUFD
  • Association between thrombophilia, VTE, and other vascular pregnancy complications including IUFD
  • Association between thrombophilia and IUFD
  • Long term effects of VTE in pregnancy and IUFD on future health including quality of life
  • Association between "single nucleotide polymorphisms" (SNP) in genes coding for specific coagulation-, fibrinolysis-, inflammatory, and other relevant proteins and their phenotypic expression
  • Association between relevant phenotypes of coagulation, fibrinolysis, inflammation, and other relevant pathways and their risk of disease
  • Association between the frequency of specific SNPs that codes for coagulation-, fibrinolysis-, inflammatory, and other relevant proteins and risk for VTE

Materials and Methods:

  • 300 women with a history of VTE in their pregnancy and 150 women with IUFD will be identified by the Norwegian patient registry (NPR) and the Medical Birth Registry (MFR). The medical records of these patients will be checked. The epidemiological data will be collected with the help of questionnaires that the patients will fill out and blood samples will be collected. Blood samples will be analyzed with the aim to check for known coagulation factors and thrombophilias as well as new gene polymorphisms.
  • 600 control women, from the maternity wards at Ullevål/Aker University Hospitals in the same time period, matched for age and ethnicity, will also answer questionnaires and donate blood samples. The medical records for these women will be checked.

Ethical problems: This study raises no new ethical problems. The study is based on voluntary participation from the invited and informed consent for all analyzes of biological test material. The study design, data procedures and storing of biological material, will use methods that assure the patients privacy at all levels.

The participants are invited to fill out a questionnaire concerning information of thrombosis in pregnancy and take one simple blood test. Women with symptoms of post thrombotic syndrome (PTS) will be offered a clinical examination of their lower extremities to verify the condition. The data will be de-identified and the individuals will not be able to be identify by other than those that have concession to the patient register established for this study.

Blood tests will be stored in a biobank at Ullevål University Hospital (UUS) established for this study, and will only be used for research related problems that have to do with this study.

Some patients could have a psychological reaction of the illness they experienced many years ago. The project leader or co-workers from the Hematology Department/Research Laboratory will handle this problem. These patients will be offered additional information on thrombosis in pregnancy.


Ages Eligible for Study:   18 Years and older
Genders Eligible for Study:   Female
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population

Cases: women with first-time validated venous thromboembolism in pregnancy or women who had experienced intrauterine fetal death, either all cases with validated data from medical records or cases meeting for blood sampling.

Controls: women from the source population; either population based with data from the Norwegian Patient Registry or Norwegian Birth Registry, or hospital-based and randomly drawn from the source population and with validated data, or subset of the latter group meeting for blood sampling


Inclusion Criteria:

  • women with first-time objectively verified venous thromboembolism in pregnancy.
  • women with history of intrauterine fetal death.

Exclusion Criteria:

  • recurrent venous thromboembolism in pregnancy.
  • non-validated venous thromboembolism in pregnancy.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00856076

Contact: Per-Morten Sandset, MD; PhD +4722119247

Oslo University Hospital Ullevaal (formerly Ullevaal University Hospital) Recruiting
Oslo, Norway, N-0407
Sub-Investigator: Anne F Jacobsen, MD, PhD         
Sub-Investigator: Linda B Helgadottir, MD         
Sub-Investigator: Astrid Bergrem, MD         
Sub-Investigator: Finn Egil Skjeldestad, MD, PhD         
Sub-Investigator: Eva-Marie Jacobsen, MD, PhD         
Sub-Investigator: Hilde S Wik, MD         
Sub-Investigator: Leiv Sandvik, PhD         
Sub-Investigator: Ida Kathrine Gravensten, Med Student         
Sub-Investigator: Anders Dahm, MD, PhD         
Oslo University Hospital (formerly Ullevaal University Hospital) Active, not recruiting
Oslo, Norway, N-0424
Sponsors and Collaborators
Oslo University Hospital
Study Director: Per Morten Sandset, MD, PhD Oslo University Hospital Ullevål and University of Oslo
  More Information

Additional publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Oslo University Hospital Identifier: NCT00856076     History of Changes
Other Study ID Numbers: VIP-study
Study First Received: March 4, 2009
Last Updated: October 17, 2011
Health Authority: Norway: Data Protection Authority
Norway: Directorate of Health

Keywords provided by Oslo University Hospital:
Venous thromboembolism
Intrauterine fetal death
Risk factor
Venous thromboembolism (in pregnancy)

Additional relevant MeSH terms:
Venous Thromboembolism
Venous Thrombosis
Fetal Death
Pathologic Processes
Embolism and Thrombosis
Vascular Diseases
Cardiovascular Diseases
Pregnancy Complications processed this record on September 22, 2014