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Managing type 1 diabetes mellitus in pregnancy—from planning to breastfeeding

Abstract

Type 1 diabetes mellitus in pregnant women increases the risk of adverse outcomes for mother and offspring. Careful preconception counselling and screening is important, with particular focus on glycaemic control, indications for antihypertensive therapy, screening for diabetic nephropathy, diabetic retinopathy and thyroid dysfunction, as well as review of other medications. Supplementation with folic acid should be initiated before conception in order to minimize the risk of fetal malformations. Obtaining and maintaining tight control of blood glucose and blood pressure before and during pregnancy is crucial for optimizing outcomes; however, the risk of severe hypoglycaemia during pregnancy is a major obstacle. Although pregnancy does not result in deterioration of kidney function in women with diabetic nephropathy and normal serum creatinine levels, pregnancy complications such as pre-eclampsia and preterm delivery are more frequent in these women than in women with T1DM and normal kidney function. Rapid-acting insulin analogues are considered safe to use in pregnancy and studies on long-acting insulin analogues have provided reassuring results. Immediately after delivery the insulin requirement declines to approximately 60% of the prepregnancy dose, and remains 10% lower than before pregnancy during breastfeeding.

Key Points

  • Tight maternal glycaemic and blood pressure control is crucial, and hypoglycaemia must be avoided during pregnancy

  • Insulin analogues can be used before and during pregnancy

  • Folic acid supplementation should be initiated before conception and continued to the end of the first trimester

  • Maternal screening for retinopathy and nephropathy should be carried out

  • Close surveillance of fetus and newborn baby is important

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Figure 1: Hypoglycaemic events in pregnancy.
Figure 2: Preterm delivery related to urinary albumin excretion in type 1 diabetes mellitus.

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L. Ringholm contributed to researching and discussing content, writing the manuscript and editing the article before submission. E. R. Mathiesen, L. Kelstrup and P. Damm contributed substantially to discussions of the content and reviewing and/or editing of the manuscript before submission.

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Correspondence to Lene Ringholm.

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P. Damm and E. R Mathiesen have acted as consultants for and received grant support from Novo Nordisk. E. R. Mathiesen has also received honoraria from Novo Nordisk. L. Ringholm and L. Kelstrup declare no competing interests.

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Ringholm, L., Mathiesen, E., Kelstrup, L. et al. Managing type 1 diabetes mellitus in pregnancy—from planning to breastfeeding. Nat Rev Endocrinol 8, 659–667 (2012). https://doi.org/10.1038/nrendo.2012.154

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