Diabetes mellitus and pregnancy

For women with diabetes mellitus, pregnancy can present some particular challenges for both mother and child. If the woman who is pregnant has diabetes, it can cause early labor, birth defects, and very large babies.

Planning in advance is emphasized if one wants to have a baby and has type 1 diabetes mellitus or type 2 diabetes mellitus. Pregnancy management for diabetics needs stringent blood glucose control even in advance of having pregnancy.

Physiology

During a normal pregnancy, many physiological changes occur such as increased hormonal secretions that influence blood glucose levels, such as a glucose-'drain' to the fetus, slowed emptying of the stomach, increased excretion of glucose by the kidneys and resistance of cells to insulin.

Risks for the child

Miscarriage, growth restriction, growth acceleration, fetal obesity (macrosomia), polyhydramnios and birth defects.

Birth defects are not currently an identified risk for the child of women with gestational diabetes, since those primarily occur in the latter part of pregnancy, where vital organs already have taken their most essential shape.

Still, having diabetes type I or II has a 2-3 ^[1] fold increase in risk of birth defects. The cause is e.g. oxidative stress, by activating protein kinase C^[1] and lead to apoptosis of some cells^[1].

Importance of blood glucose level during pregnancy

High blood sugar is harmful to both the mother and her fetus. Experts advise diabetics to maintain the blood sugar level close to normal range for 2 to 3 months in advance, before planning for pregnancy. Managing blood sugar close to normal before and during pregnancy helps to protect the health of both mother and the baby.

Insulin may be needed for type 2 diabetics instead of diabetes medication (oral) or extra insulin may be needed for type 1 diabetics during pregnancy. Doctors' may advise to check blood sugar more often to maintain near normal blood sugar level.

Tips for diabetics before and during pregnancy

• Coordinate with the health care team to achieve blood sugar level close to the normal range.
• Consult with a doctor, who has experience in handling diabetes mellitus during pregnancy.
• Put some extra care to the eyes and kidneys and check it frequently, because pregnancy may make it worst.
• Stop smoking, drinking alcohol, or use of harmful drugs.
• Consult and coordinate with an experienced dietician and plan your meal and follow it strictly and make sure the mother and the unborn baby have a healthy diet.

If already pregnant, then consult the doctor right away. It’s not too late to bring the blood sugar close to normal so that the mother and the baby stay healthy during the rest of the pregnancy.

Diabetes pregnancy management

Diabetes mellitus may be effectively managed by appropriate meal planning, increased physical activity and properly-instituted insulin treatment. Some tips for controlling diabetes in pregnancy include:

• Meals – cut down sweets, eats three small meals and one to three snacks a day, maintain proper mealtimes, and include balanced fiber intake in the form of fruits, vegetables and whole-grains.
• Increased physical activity - walking, swimming/aquaerobics, etc.
• Monitor blood sugar level frequently, doctors may ask to check the blood glucose more often than usual.
• The blood sugar level should be below 95 mg/dl (5.3 mmol/l) on awakening, below 140 mg/dl (7.8 mmol/l) one hour after a meal and below 120 mg/dl (6.7 mmol/l) two hours after a meal.
• Each time when checking the blood sugar level, keep a proper record of the results and present to the health care team for evaluation and modification of the treatment. If blood sugar levels are above targets, a perinatal diabetes management team may suggest ways to achieve targets.
• Many may need extra insulin during pregnancy to reach their blood sugar target. Insulin is not harmful for the baby.

Breast feeding

Breast feeding is good for the child even with a mother with diabetes mellitus. Some women wonder whether breast feeding is recommended after they have been diagnosed with diabetes mellitus. Breast feeding is recommended for most babies, including when mothers may be diabetic. In fact, the child’s risk for developing type 2 diabetes mellitus later in life may be lower if the baby was breast-fed. It also helps the child to maintain a healthy body weight in infancy.

Classification

The White classification, named after Priscilla White^[2] who pioneered research on the effect of diabetes types on perinatal outcome, is widely used to assess maternal and fetal risk. It distinguishes between gestational diabetes (type A) and diabetes that existed before pregnancy (pregestational diabetes). These two groups are further subdivided according to their associated risks and management.^[3]

There are 2 classes of gestational diabetes (diabetes which began during pregnancy):

• Class A₁: gestational diabetes; diet controlled
• Class A₂: gestational diabetes; insulin controlled

The second group of diabetes which existed before pregnancy can be split up into these classes:

• Class B: onset at age 20 or older or with duration of less than 10 years
• Class C: onset at age 10-19 or duration of 10–19 years
• Class D: onset before age 10 or duration greater than 20 years
• Class E: overt diabetes mellitus with calcified pelvic vessels
• Class F: diabetic nephropathy
• Class R: proliferative retinopathy
• Class RF: retinopathy and nephropathy
• Class H: ischemic heart disease
• Class T: prior kidney transplant

An early age of onset or long-standing disease comes with greater risks, hence the first three subtypes.

Treatment of pregnant women with diabetes

Blood glucose levels in the pregnant woman should be regulated as strictly as possible. In diabetes mellitus type 2, oral antidiabetic drugs should be replaced with insulin.

See also

• Diabetes mellitus
• Gestational diabetes
• Pregnancy

Footnotes

1. ^ ^{a b c} Author: Gäreskog, Mattias Title: Teratogenicity Involved in Experimental Diabetic Pregnancy
2. ^ White P. Pregnancy complicating diabetes. Am J Med 1949; 7: 609. PMID 15396063
3. ^ Gabbe S.G., Niebyl J.R., Simpson J.L. OBSTETRICS: Normal and Problem Pregnancies. Fourth edition. Churchill Livingstone, New York, 2002. ISBN 0-443-06572-1

External links

• CDC’s National Center on Birth Defects and Developmental Disabilities