Risk of Pulmonary and Venous Thromboembolism in Pregnancies After in Vitro Fertilization

This study has been completed.
Sponsor:
Collaborator:
Karolinska Institutet
Information provided by (Responsible Party):
Professor Peter Henriksson, Danderyd Hospital
ClinicalTrials.gov Identifier:
NCT01524393
First received: January 28, 2012
Last updated: February 1, 2012
Last verified: January 2012
  Purpose

Occurrence of venous thromboembolism during in Vitro Fertilization (IVF) pregnancies has been reported in numerous case reports and in two small consecutive series. The incidence of venous thromboembolism (VTE) after IVF has been claimed to be comparable to the incidence of VTE during normal pregnancy. No information exists concerning pulmonary embolism (PE).

The aim is to estimate and compare the risk of both PE and VTE during the the different phases of pregnancy after IVF to that in age and period matched control women. The investigators will use the Swedish National Health Registers to estimate the risk.


Condition
Pulmonary Embolism
Venous Thromboembolism

Study Type: Observational
Study Design: Time Perspective: Cross-Sectional
Official Title: Estimation of the Risk of Pulmonary Embolism and Venous Thromboembolism in Pregnancy After in Vitro Fertilization.

Resource links provided by NLM:


Further study details as provided by Danderyd Hospital:

Enrollment: 140458
Study Start Date: January 1990
Study Completion Date: December 2010
Primary Completion Date: December 2008 (Final data collection date for primary outcome measure)
Groups/Cohorts
IVF pregnancy

Detailed Description:

Background: Occurrence of venous thromboembolism (VTE) during IVF pregnancies has been reported in numerous case reports and in two small consecutive series. The incidence of VTE after IVF has been claimed to be comparable to the incidence of VTE during normal pregnancy. No information exists concerning pulmonary embolism (PE).

Aim: The aim is to estimate and compare the risk of both PE and VTE during the trimesters of pregnancy after IVF to that in age and period matched control women.

Design and methods: A cross-sectional study using linkage of Swedish population and health registers. The Swedish National Patient Register encompasses inpatients and outpatients. Inpatient data in Sweden is available nationwide since 1987. Outpatient diagnoses from hospitals started to be collected in 1997. Data in the Patient Register will be linked to the Swedish Medical Birth Register (MBR) at the National Board of Health and Welfare through the unique personal identity number assigned to all Swedish residents, Exposed women: Mothers who had given birth to a child as a result of IVF will be retrieved from the Swedish IVF Register at the National Board of Health and Welfare. The Swedish IVF Register is now a part of the Swedish Medical Birth Register (MBR) at the National Board of Health and Welfare and includes information on IVF pregnancies since 1982.

We will restrict the retrieval to mothers of a child born as from 1990 until 2008 and who had their first child born after assisted reproduction by IVF.

Unexposed women: Each IVF woman will be matched with 5 unexposed women from the MBR by calendar year of delivery and maternal age.

Information will be retrieved on country of birth, pre-pregnancy body mass index, family situation, cigarette smoking habits, number of older siblings, singleton/multiple births, and estimated length of gestation from the MBR register. Dates of the trimesters is calculated from the length of gestation. Women´s education is found in the Register of Education, Statistics Sweden, by linkage through the personal identity number.

Diagnoses of VTE including PE will be found by linkage to the Swedish Patient Register of the National Board of Health and Welfare. This register comprises date of admission and discharge, and main diagnosis with up to seven contributing diagnoses. Diagnoses are recorded according to the International Classification of Diagnoses (ICD), ninth version prior to 1996 and the tenth version from 1997. Codes used were 415B, 451B, 452, 453C-D, 453W, 453X, 673C, 671D-E, 671F in ICD9 and I260, I269, I801- 3, I808-9, I822-3, I828-9, O223, O225, O871, O873, O879, O882 in ICD10.

The study is approved by the Research Ethics Committee of Karolinska Institutet, Stockholm, Sweden (Dnr 2010/267-31/4).

  Eligibility

Genders Eligible for Study:   Female
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population

All mothers who had given birth to a child.

Criteria

Inclusion Criteria:

Exposed women:

  • All mothers who had given birth to a child as a result of IVF will be retrieved from the Swedish Medical Birth Register (MBR) at the National Board of Health and Welfare.

Unexposed women:

  • Each IVF woman will be matched with up to 5 unexposed women from the MBR by calendar year of delivery ±2 years and maternal age ±1 year.
  Contacts and Locations
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Please refer to this study by its ClinicalTrials.gov identifier: NCT01524393

Locations
Sweden
Karolinska Institutet
Stockholm, Sweden
Sponsors and Collaborators
Danderyd Hospital
Karolinska Institutet
Investigators
Study Chair: Anders Ekbom, Professor Clinical Epidemiology Unit, Department of Medicine, Karolinska Institutet, Stockholm, Sweden
Principal Investigator: Peter Henriksson, Professor Division of Cardiovascular Medicine, Department of Clinical Sciences, Danderyd Hospital, Karolinska Institutet, Stockholm, Sweden
Study Chair: Outi Hovatta, Professor Department of Clinical Science, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden
  More Information

Publications:
Additional publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Responsible Party: Professor Peter Henriksson, Professor, Danderyd Hospital
ClinicalTrials.gov Identifier: NCT01524393     History of Changes
Other Study ID Numbers: Dnr 2010/267-31/4
Study First Received: January 28, 2012
Last Updated: February 1, 2012
Health Authority: Sweden: Regional Ethical Review Board

Keywords provided by Danderyd Hospital:
Assisted Reproductive Techniques
Pregnancy
Pulmonary Embolism
Venous Thromboembolism

Additional relevant MeSH terms:
Embolism
Pulmonary Embolism
Thromboembolism
Venous Thromboembolism
Venous Thrombosis
Embolism and Thrombosis
Vascular Diseases
Cardiovascular Diseases
Lung Diseases
Respiratory Tract Diseases
Thrombosis

ClinicalTrials.gov processed this record on August 18, 2014