Pregnancy and antenatal care

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chapter 54 Pregnancy and antenatal care

PRECONCEPTION COUNSELLING

Comprehensive pregnancy care begins with the first discussion of conception, particularly for nulligravida. Ideally this consultation should occur 6–12 months before starting to attempt to conceive.

It may take the form of a formal preconception consultation, or begin with opportunistic questioning by the GP at the routine check-up of a woman of childbearing age (approximately 15–49 years), such as:

Enquire about previous pregnancies and the outcomes, including infant death, fetal loss, birth defects, low birth weight, preterm birth, or gestational diabetes or other maternal complications.

Chronic medical conditions such as diabetes need to be fully assessed and management optimised.

Immunisation status needs to be checked, particularly for preventable infectious diseases likely to affect a pregnancy, such as rubella, varicella, hepatitis B and measles. If non-immune, rubella and varicella immunisation need to be given at least 28 days before planned conception.

Influenza vaccination can be given at any time in pregnancy, particularly if the second or third trimester falls in influenza season.

Diphtheria/tetanus/pertussis combined vaccine should be given if a booster dose is due. This helps to protect the newborn from pertussis before they are old enough to have their immunisations.

Investigations might include:

The genetic history should explore any congenital abnormalities in the extended biological family and, if necessary, genetic counselling arranged.

An important principle to remember is that any investment in the mother’s wellbeing—and the wider family, for that matter—is an investment in the wellbeing of the pregnancy and the future of the child. Preparation for pregnancy needs to address the woman’s physical, emotional and spiritual situation, including her beliefs about her relationship, parenting and lifestyle. It is helpful to consider the elements using the ESSENCE model, as discussed below (also see Ch 6).

EXERCISE

Optimum fitness is a desirable goal prior to conception. Pregnancy adds a significant physical and physiological load, so aerobic and resistance training to help build fitness and muscle strength, and a back care program, will help her to cope with the pregnancy and childbirth far more effectively. She will also be able to reduce the risk of hypertension and diabetes during pregnancy, improve immunity and mental health and minimise complications. It should also be remembered that exercising to excess during pregnancy can be as much of a problem as being inactive.

Stretching and yoga improve flexibility. Patients with low back problems can be referred for back rehabilitation programs such as those supervised by physiotherapists or exercise physiologists.

Once the patient is pregnant, she can continue or adjust her current exercise program (Box 54.1).

BOX 54.1 Exercise advice for women with a normal pregnancy

Activities to be avoided in pregnancy:

NUTRITION

Assess the patient for possible nutritional risk, especially if the patient is vegan, lactose-intolerant, has coeliac disease or other gut problems or an eating disorder likely to affect nutritional status. If the woman’s body weight is in the normal range, then dietary advice will focus on the quality and balance of foods she is eating.

However, women who are either significantly overweight or underweight need to address this risk factor. Obese women are 2.7 times more likely to be infertile than women in the healthy weight range. Obesity in women can also increase the risk of miscarriage and impair the outcomes of assisted reproductive technologies and pregnancy.4 It is also associated with an increased rate of caesarean section.5

Being underweight is associated with reduced conception rates among nulliparous women and increased likelihood of conception among parous women.6

Some foods are to be avoided because of the risk of listeriosis, which causes a risk of miscarriage. These foods include raw seafood, pre-prepared (salad bar) salads, delicatessen meats, leftovers, soft cheeses and pâté. All fruit and vegetables should be washed in filtered water before eating.

Eating a fresh, varied and healthy diet is important during pregnancy, as it is at any other time. Supplementation, particularly for those with poor vegetable intake, with a multivitamin containing 500 μg folate should commence prior to conception. Iron, zinc, vitamin D, calcium and iodine are all essential nutrients that may be lacking, and should be included in the choice of a high-quality antenatal supplement. A good intake of omega-3 fatty acids is also important for fetal development, and supplements of 3 g daily should be considered for those with a poor intake.

Some women think that ‘if one supplement is good, then more is better’. Check the contents of any supplements or over-the-counter preparations that are being taken, and be sure to avoid excess. This may particularly be the case for substances such as vitamin A.