Cardiac disease in pregnancy is becoming more common. There are several reasons for this:
- Due to better care, women with congenital cardiac disease are surviving to reproductive age.
- Changes in demography have also resulted in an increase in incidence in areas where there are large immigrant communities. One study in West London found that of 139 women referred for evaluation of a heart murmur in pregnancy, 97% were found to have a physiological murmur and only four patients had significant new conditions. Three out of the four women were immigrants with no previous history of heart disease.
- The tendency to postpone motherhood until the third decade is having an effect.
The report of confidential enquiries into maternal and neonatal deaths in the UK 2006-2008 reported a total of 53 deaths due to heart disease in pregnancy. The number in the previous triennium was 48. The rate for indirect maternal deaths was 6.72/100,000 pregnancies and, within that, the rate for cardiac disease was 2.31 per 100,000 maternities. Therefore, cardiac disease is the most common cause of indirect maternal death and the most common overall cause of death.
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Risk factors for heart disease in pregnancy include:
The last factor listed above is becoming important as more women in older age groups seek assisted conception.
Sudden arrhythmic death syndrome (SADS) was the most common cause of maternal cardiac death in 2006-2008 (10 deaths), closely followed by cardiomyopathy (9 deaths).
Other leading causes were aortic dissection, ischaemic heart disease and myocardial infarction. Deaths from pulmonary hypertension and from congenital heart disease continue to decrease. The last 50 years have seen a dramatic reduction in rheumatic heart disease but it is still seen in immigrant communities and in developing countries. However, there were no deaths from rheumatic heart disease in this last triennium.
What to look for at booking or later in pregnancy
The recommendations of the last Centre for Maternal and Child Enquiries (CMACE) report state that: "There must be a low threshold for further investigation of pregnant or recently delivered women who complain of chest pain that is severe, or radiates to the neck, jaw or back, or is associated with other features such as agitation, vomiting or breathlessness, tachycardia, tachypnoea, orthopnea or acidosis. This is especially important for women who smoke, are obese or who have hypertension."
The following should be discussed at the booking clinic:
- A past history of congenital or acquired heart disease.
- A family or personal history of congenital heart disease.
- A history of hypertension.
- A history of breathlessness, fatigue, or oedema.
The symptoms of incipient de novo heart disease are nonspecific and often present in healthy pregnant women but a high index of suspicion is the safest course. See individual conditions for other presenting symptoms.
It should be remembered that physiological changes to the haemodynamic status in pregnancy may alter the presentation of a variety of cardiac conditions.
NB: murmurs - one study of 199 healthy pregnant women found that 93.2% had a systolic murmur at some time during their pregnancy. They are invariably systolic, may be early, mid or late and there may be a diastolic component. They are located predominantly at the second left intercostal space or along the left sternal border, although they may radiate widely. They may occur at any stage in pregnancy and may come and go.
Sudden arrhythmic death syndrome
The case definition for sudden arrhythmic death syndrome (SADS) is a sudden unexpected cardiac death (ie presumed fatal arrhythmia) where all other causes of sudden collapse are excluded, including a drug screen for stimulant drugs such as cocaine. These are exacting criteria.
The physiological stresses of pregnancy and delivery are thought to bring out an underlying potential cardiac arrhythmia. Unfortunately these deaths are unpredictable.
Puerperal cardiomyopathy and myositis
This is also known as peripartum cardiomyopathy as it can present one month before, as well as five months after, delivery. The incidence is 1:1,500 to 1:4,000 live births.
Risk factors include older age, greater parity, black race and multiple gestations. Viral myositis has been implicated in the aetiology. Dyspnoea, fatigue and ankle oedema can present in both late pregnancy and cardiomyopathy but nocturnal dyspnoea, nocturnal cough and chest pain are symptoms that should raise suspicion. Signs may include new regurgitant murmurs, pulmonary crackles, elevated jugular venous pressure and hepatomegaly.
- ECG may show left ventricular hypertrophy and CXR invariably shows cardiomegaly. Echocardiography demonstrates recent left ventricular dysfunction.
- Cardiac MRI is a safe and non-invasive procedure which can help with both diagnosis and prognosis.
- Endomyocardial biopsy may be required in cases of diagnostic difficulty.
- Salt restriction should be instituted and diuretics prescribed to relieve pulmonary oedema.
- Vasodilators such as hydralazine, nitrates or amlodipine should be given to reduce afterload in the presence of ventricular dysfunction. Angiotensin-converting enzyme (ACE) inhibitors are fetotoxic but are the mainstay of treatment postpartum.
- Patients are at high risk of thromboembolism and anticoagulation should be considered.
- The timing of delivery should be dictated by obstetric considerations.
The incidence is 1 in 10,000 deliveries. The condition occurs more commonly in the later stages of pregnancy. Risk factors include smoking, increasing maternal age and diabetes. The presenting symptom is chest pain.
The majority of patients do not have increased risk factors. The causative mechanism is often coronary artery dissection, involving a mechanism similar to aortic dissection. 20% of women have intracoronary thrombus or arteriosclerosis on angiography.
- Treatment involves coronary artery stenting and coronary artery bypass graft.
- Tissue plasminogen activator (TPA) is another option. It does not cross the placental barrier so does not cause fetal problems but should be avoided in the early puerperium as it increases the risk of haemorrhage.
The condition is rare but accounts for 50% of aortic dissection in women aged under 40. It occurs in association with severe hypertension secondary to pre-eclampsia, coarctation of the aorta, or connective tissue disease such as Marfan's syndrome. The presenting symptoms are chest pain or interscapular pain. associated with end-organ ischaemia, acute heart failure, aortic incompetence, or haemopericardium with tamponade.
The condition is diagnosed by computerised tomography or transoesophageal echocardiography.
Management options include intrapartum repair of the dissection with support of cardiopulmonary bypass, postpartum repair, Caesarean section, or vaginal delivery under regional anaesthesia. Choice will depend upon gestation and the vascular status of the mother.
Congenital heart disease
Congenital heart disease is one of the most common congenital abnormalities and the prevalence of this condition in pregnancy is about 0.8%. Deaths from congenital heart disease are uncommon.
Grown-up congenital heart disease (GUCHD) is likely to be identified whilst taking the history. Undetected congenital disease may be missed unless cyanosis develops. Acyanotic conditions, such as atrial and ventricular septal defects or persistent ductus arteriosus, usually cause no increased maternal or fetal risk. Likewise, cyanotic conditions such as Fallot's tetralogy that have been repaired surgically usually cause no problems. The main problems arising from congenital heart disease are due to pulmonary hypertension or Eisenmenger's syndrome.
Fetal echocardiography should be used after 20 weeks to detect fetal heart defects in a mother with congenital heart disease. No other investigations are required unless pulmonary hypertension or Eisenmenger's syndrome are suspected.
Ideally, assessment should take place prior to pregnancy to see whether any surgical correction is required. In uncomplicated cases, no special treatment is required and the timing of delivery can be dictated by obstetric considerations.
Primary pulmonary hypertension is rare. It is defined clinically by a persistently elevated pulmonary artery pressure (PAP), mean pressure >25 mm Hg at rest, without an obvious aetiology. Secondary pulmonary hypertension is much more common and is associated with atrial and septal defects, mitral valve disorders and many non-cardiac causes. Symptoms include dyspnoea on exertion, syncope on exertion, fatigue, lethargy and chest pain. Less common symptoms include cough, haemoptysis and hoarseness. Signs include loud second heart sounds, a systolic ejection murmur heard over the left sternal border and a right-sided fourth heart sound.
Echocardiography will demonstrate evidence of right heart failure. Diagnosis can be confirmed by ventilation perfusion scans, computed tomographic pulmonary angiography or right heart catheterisation and digital subtraction.
Options are designed to promote pulmonary vasodilation and include oral nifedipine or parenteral prostacyclin and nitric oxide, The patient should be anticoagulated to reduce the risk of thromboembolism. Premature spontaneous delivery is common but, if this does not happen, delivery should be planned for 32-34 weeks.
This is seen less frequently due to the reduction in rheumatic fever. However, stenosis is still common in immigrant communities. In the UK, calcific degeneration of congenital bicuspid aortic valves is the leading cause of stenosis encountered in pregnancy. Stenosis poses more of a problem than incompetence, because the increased cardiac output is associated with heart failure and arrhythmias. All pregnant women should have antibiotics to reduce the risk of endocarditis. If anticoagulation is required, warfarin is considered to be the safest option.
- The increase in the gradient between the left atrium and left ventricle is accentuated in pregnancy, leading to symptoms and signs of left heart failure, pulmonary oedema, arrhythmias and cardiovascular collapse. Atrial fibrillation may develop.
- Echocardiography can be used for diagnosis and to assess the patient's suitability for surgery.
- Bed rest, oxygen and diuretics may be required in the early stages. In severe cases, balloon mitral valvulotomy gives excellent results. There is evidence that this is preferable to open heart valve surgery (commissurotomy).
- As with non-pregnant patients, the presenting features include angina, syncope and symptoms and signs of left and right heart failure. A diastolic murmur with opening snap may be heard.
- Echocardiographic estimation of valve area is the best investigation.
- Diuretics and vasodilators may be required to treat heart failure, pulmonary congestion and hypertension. Digoxin may be necessary to control atrial fibrillation. Symptomatic patients may require antenatal balloon valvuloplasty, open heart valve surgery, or valve replacement.
- Acute incompetence is caused by aortic dissection, bacterial endocarditis, or malfunction of a prosthetic valve. Chronic incompetence is associated with bicuspid aortic valve or rheumatic heart disease. Acute incompetence presents with cardiogenic shock and acute pulmonary oedema. Chronic incompetence is usually tolerated well in pregnancy but advanced cases present with dyspnoea, chest pain and decreased exercise tolerance. Physical signs include a wide pulse pressure, brisk carotid pulse and mildly displaced apical impulse. An early diastolic murmur on the left sternal border and soft second heart sounds may also be heard.
- Transthoracic echocardiography and Doppler studies help to confirm the diagnosis and assess the severity of incompetence.
- Acute incompetence is a surgical emergency that requires urgent valve replacement. Asymptomatic patients with chronic incompetence only require monitoring. Mild symptoms respond to diuretics, hydralazine and nitrates. Patients with ventricular dysfunction may require digoxin. Surgical intervention is not usually required.
- With incompetence, the reduced systemic vascular resistance of pregnancy limits the effects of regurgitation. The condition is therefore normally tolerated well in pregnancy. In advanced disease, dilation of the left ventricle and atrium leads to elevation of pulmonary and arterial pressure. Symptoms include dyspnoea on exertion, orthopnoea and paroxysmal nocturnal dyspnoea. Left displacement of the apex and a pansystolic murmur are prominent signs.
- Doppler echocardiography to assess the structure of the valve and the size of the left ventricle and measurement of the pulmonary arterial pressure are the most contributory investigations.
- Hydralazine, diuretics and digoxin should be given when systolic function is impaired. In severe cases, mitral valve repair may be required, with valve replacement used as a last resort.
Other valve disease
Pulmonary and tricuspid valves can also be involved, usually along with mitral valve disease. Left ventricular failure is rare but post-exertion syncope and angina can appear for the first time in pregnancy, especially during the last trimester.
The haemodynamic strain associated with pregnancy may mask a pre-existing condition (eg rheumatic heart disease) or a pregnancy-associated cardiac complication may develop (eg cardiomyopathy). Most patients will present for the first time to obstetricians or GPs, not to cardiologists. Early diagnosis is important but can be challenging because symptoms and signs (eg fatigue, shortness of breath, oedema and systolic ejection murmurs) can mimic the physiological changes of pregnancy. A low threshold of referral to a cardiologist should therefore be maintained.
Women with pre-existing heart disease should have specialist preconceptual counselling as well as advice about the use of appropriate contraception.
High risk of maternal mortality is associated with:
- Pulmonary hypertension.
- Severely depressed systemic ventricular function (ejection fraction <30%).
- Severe left heart obstruction.
- Marfan's syndrome with ascending aorta >40 mm.
- Peripartum cardiomyopathy with residual impairment of left ventricular function.
Women with significant risk include those with:
- Cyanotic heart disease.
- Other complex congenital heart disease including Fontan's circulation (which results from a single ventricle anomaly) and systemic right ventricle (a right ventricle supporting the systemic circulation either due to congenital anomaly or surgery).
- Mechanical prosthetic valves.
Further reading & references
- Bonow RO, Carabello BA, Chatterjee K, et al; ACC/AHA 2006 guidelines for the management of patients with valvular heart disease: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines (writing Committee to Revise the 1998 guidelines for the management of patients with valvular heart disease) developed in collaboration with the Society of Cardiovascular Anesthesiologists endorsed by the Society for Cardiovascular Angiography and Interventions and the Society of Thoracic Surgeons. J Am Coll Cardiol. 2006 Aug 1;48(3):e1-148.
- Lupton M, Oteng-Ntim E, Ayida G, et al; Cardiac disease in pregnancy. Curr Opin Obstet Gynecol. 2002 Apr;14(2):137-43.
- Tan J, de Swiet M; Prevalence of heart disease diagnosed de novo in pregnancy in a West London population. Br J Obstet Gynaecol. 1998 Nov;105(11):1185-8.
- Pieper PG; Expected and unexpected cardiac problems during pregnancy. Neth Heart J. 2008 Dec;16(12):403-5.
- Saving Mothers' Lives. Reviewing maternal deaths to make motherhood safer: 2006-2008; Centre for Maternal and Child Enquiries (CMACE), BJOG. Mar 2011
- Leurent G; Cardiac MR1 and peripartum cardiomyopathy. Int J Cardiol. 2008 Dec 28.
- Satpathy HK, Frey D, Satpathy R, et al; Peripartum cardiomyopathy. Postgrad Med. 2008 Apr;120(1):28-32.
- Head CE, Thorne SA; Congenital heart disease in pregnancy. Postgrad Med J. 2005 May;81(955):292-8.
- Cardiac Disease and Pregnancy, Royal College of Obstetricians and Gynaecologists (June 2011)
- Pieper PG, Balci A, Van Dijk AP; Pregnancy in women with prosthetic heart valves. Neth Heart J. 2008 Dec;16(12):406-11.
- Akhtar RP, Abid AR, Zafar H, et al; Anticoagulation in pregnancy with mechanical heart valves: 10-year experience. Asian Cardiovasc Thorac Ann. 2007 Dec;15(6):497-501.
- de Souza JA, Martinez EE Jr, Ambrose JA, et al; Percutaneous balloon mitral valvuloplasty in comparison with open mitral valve commissurotomy for mitral stenosis during pregnancy. J Am Coll Cardiol. 2001 Mar 1;37(3):900-3.
- Ren X et al; Aortic Stenosis, Medscape, Jan 2012
- Prasad AK, Ventura HO; Valvular heart disease and pregnancy. A high index of suspicion is important to reduce risks. Postgrad Med. 2001 Aug;110(2):69-72, 75-6, 82-3, passim.
|Original Author: Dr Laurence Knott||Current Version: Dr Hayley Willacy||Peer Reviewer: Dr John Cox|
|Last Checked: 19/08/2011||Document ID: 2970 Version: 24||© EMIS|
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