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Severe Hypoglycemia in Pregnant Women With Type 1 Diabetes

This study has been completed.
Information provided by:
Rigshospitalet, Denmark Identifier:
First received: February 14, 2007
Last updated: NA
Last verified: February 2007
History: No changes posted


The risk of stillbirth and preterm delivery is three times increased among pregnant women with type 1 diabetes compared with healthy pregnant women. Normal blood glucose levels are mandatory in order to prevent these complications. Severe hypoglycemia (requiring assistance from another person) is the decisive limiting factor for obtaining near-normal blood glucose regulation in pregnant women with type 1 diabetes. Severe hypoglycemia occurs in about one third of pregnancies complicated with type 1 diabetes and can result in unconsciousness, traffic accidents and deaths.

Aim: To test the following hypotheses:

  1. Severe hypoglycemia is frequent in pregnancy complicated by type 1 diabetes with the highest incidence in gestational weeks 8-16 and the lowest incidence in gestational weeks 28-34
  2. Predictors for severe hypoglycemia during pregnancy complicated with type 1 diabetes can be identified at the first pregnancy visit
  3. Possible pathophysiological mechanisms include changes in the growth hormone system and in the renin-angiotensin-system during pregnancy


One hundred and eight pregnant women with type 1 diabetes are consecutively and prospectively included. In connection with the clinical control at the first pregnancy visit at week 9 and in gestational weeks 14, 22, 28, 34 and one day postpartum the following tests are carried out:

The patients are asked to answer a validated questionnaire about mild and severe hypoglycemia and hypoglycemia-associated factors such as blood glucose level during hypoglycemia, the degree of awareness, pregnancy-associated nausea and vomiting, insulin type and dose etc. Other medication, exercise habits, coffee- and alcohol intake, smoking and social status will be recorded. In case of severe hypoglycemia a structured interview concerning the episode will be performed within 24 hours. Blood glucose, HbA1c, the degree of insulin resistance and the levels of IGF1, placenta growth hormone and of the renin-angiotensin-system will be monitored.

Pregnancy Diabetes

Study Type: Observational
Study Design: Observational Model: Defined Population
Time Perspective: Longitudinal
Time Perspective: Prospective
Official Title: Severe Hypoglycemia in Pregnant Women With Type 1 Diabetes. Incidence, Risk Markers and Possibilities for Prevention

Resource links provided by NLM:

Further study details as provided by Rigshospitalet, Denmark:


Ages Eligible for Study:   Child, Adult, Senior
Sexes Eligible for Study:   Female

Inclusion Criteria:

  • Type 1 diabetes
  • Pregnancy before gestational week 14

Exclusion Criteria:

  • Other diseases that might influence the risk of severe hypoglycemia
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Please refer to this study by its identifier: NCT00435565

Sponsors and Collaborators
Rigshospitalet, Denmark
Principal Investigator: Lene R Nielsen, MD Rigshospitalet, Denmark
  More Information Identifier: NCT00435565     History of Changes
Other Study ID Numbers: ringholm
Study First Received: February 14, 2007
Last Updated: February 14, 2007

Additional relevant MeSH terms:
Diabetes Mellitus
Glucose Metabolism Disorders
Metabolic Diseases
Endocrine System Diseases processed this record on September 21, 2017