Pregnancy and heart disease

Pregnant women in an exercise session

Sarah Brealey explores issues of pregnancy and your heart and meets two women who fought back from health issues.

“In this country, pregnancy is low risk,” says Dr Sara Thorne, a Consultant Cardiologist at Queen Elizabeth Hospital Birmingham, who specialises in adult congenital heart disease and heart disease in pregnancy.

“That said, heart disease is the biggest single cause of maternal deaths in the UK. There is a 50 per cent increase in how much your heart has to do by the end of the first trimester; that has to be sustained for six months.”

If you have a heart condition, get specialist advice before trying to conceive. “It’s important to see the right cardiologist, preferably alongside an obstetrician,” advises Dr Thorne. “If you’re being seen by a congenital heart disease service, they should have the right degree of knowledge, but if you’re seeing a general cardiologist, you may need to ask to be referred to a specialist.”

Pregnancy women statsShe says women should be particularly careful if they suffer from cardiomyopathy or diseases affecting the aorta (such as Marfan syndrome or Loeys–Dietz syndrome) or mitral or aortic valve stenosis.

Pulmonary arterial hypertension (which is rare but more common in women) can be extremely dangerous in pregnancy, so women would usually be advised against having a child.

“It’s important not to fall pregnant accidentally,” says Dr Thorne. “Think about contraception. There are several heart conditions where you will not be able to take the combined pill. If you are taking a progestogen-only pill, get advice to ensure you choose the most effective one.

“Pregnancy may make your condition worse, so consider how you would cope with a baby,” adds Dr Thorne. “And if you have a heart condition, it may be better to have your family in your 20s – don’t put it off.”

Some women won’t realise they have heart conditions until problems arise and, although numbers are small, heart attacks are one of the biggest causes of maternal death in the developing world. It’s worth reducing your risks before you get pregnant. “Lose weight if you are overweight, take regular exercise, stop smoking and manage issues like high blood pressure,” says Dr Thorne.

Pre-eclampsia

This affects up to six per cent of women during the second half of pregnancy or soon after giving birth. Early signs include high blood pressure and protein in your urine. Women are tested for these at antenatal appointments, as symptoms may not be obvious. Most cases are mild, but it can have serious complications for both mother and baby if not treated. It will usually go away after birth.

Although the exact cause isn’t known, having diabetes and high blood pressure could increase your chances of developing pre-eclampsia, so it’s important to follow a healthy lifestyle to reduce your risk as much as you can.

Gestational diabetes

Jennie, 38, from Tewkesbury, Gloucestershire, with her son MichaelGestational diabetes is fairly common during pregnancy, especially after 28 weeks. It affects up to 18 out of every 100 women who give birth in England and Wales.

Symptoms include dry mouth, needing to urinate frequently, tiredness and infections such as thrush. It can be controlled with diet and exercise, but some women need medication.

Untreated, it can cause premature birth or health issues for the baby, such as low blood sugar. It often goes away after birth, but you’re at increased risk in future pregnancies. It also means you are at an increased risk of developing type 2 diabetes.

Research into rare conditions

Spontaneous coronary artery dissection (SCAD) happens when inner layers of a coronary artery tear away from the outer layer. It can lead to a heart attack and can be fatal.

Eighty per cent of sufferers are women, and 30 per cent are in late pregnancy or have recently given birth. We’re funding the UK’s first research into this poorly understood condition.

We’re also funding research into pulmonary arterial hypertension – a condition affecting blood vessels in the lungs. Women are four times more likely to be affected, possibly because sex hormones play a role in the development of the condition.

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