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General management of pulmonary arterial hypertension associated with adult congenital heart disease
Journal of Congenital Cardiology volume 4, Article number: 17 (2020)
Over the past 15 years there have been significant improvements in the treatment of pulmonary arterial hypertension due to congenital heart disease. Patients now live for several decades, but morbidity and mortality remain high. This article describes the holistic management of this patient group with an emphasis on both the physical and psychosocial aspects of care, taking into account the consequences of chronic cyanosis, avoiding complications and improving quality of life.
Improvements in the management and treatment of congenital heart disease (CHD) since the turn of the century have led to a population which is both growing and ageing . An estimated 10–28% of these patients develop pulmonary arterial hypertension (PAH) [2, 3] . As the age of the patients increase, so do co-morbidities and the long-term consequences of chronic cyanosis. It is, therefore, essential that this group of complex patients are managed in expert centres that are aware of the potential medical risk factors, can provide patient education, and improve quality of life  and life expectancy .
This article will discuss the general management of patients with PAH-CHD, with an emphasis on a holistic approach, taking into account not only the physical aspects of their care, but also the social and psychological needs of the patient and their family. The treatment of PAH-CHD with pulmonary vasodilator therapy is not covered as it is discussed in another paper in this supplement.
Physical aspects of PAH-CHD care
Management of the consequences of PAH-CHD (Table 1)
Chronic hypoxaemia is typical of Eisenmenger syndrome (ES), the extreme end of the spectrum of PAH-CHD. It is related to right-to-left shunting of blood across cardiac defects, in the presence of severe pulmonary vascular remodelling. Hence, the use of supplemental oxygen is not recommended for all ES patients, but should be considered in cases in which it produces a consistent increase in arterial oxygen saturation and improvement in symptoms . Indeed, in a small number of patients, long-term home oxygen therapy may improve symptoms, but this has not been shown to modify survival . The continuous use of day and night-time oxygen may also lead to dependence and physical deconditioning through immobilisation  and is, therefore, not recommended as routine care. Screening for sleep apnoea and nocturnal hypoventilation should be considered, especially in patients with Down Syndrome or spinal abnormality as this could contribute further to the level of hypoxaemia .
Chronic cyanosis results in elevated renal production of erythropoietin, which promotes erythropoiesis and secondary erythrocytosis. These higher levels of haemoglobin are beneficial as they enhance oxygen transport and delivery  to maintain tissue oxygenation and prevent hypoxic end-organ damage . Repeated venesections can potentially increase the risk of ischaemic cerebrovascular events as this causes iron deficiency and microcytosis that may increase blood viscosity . It is, therefore, recommended that therapeutic phlebotomy should only be performed in the presence of moderate/severe hyperviscosity symptoms, which do not resolve with adequate hydration .
Patients with PAH-CHD develop robust bronchial collaterals with a consequent risk of arterial bleeding, resulting in haemoptysis . Whilst this can be common in patients with ES physiology, and is a concern for patients and healthcare professionals, it does not seem to be predictive of mortality . In patients with large volume haemoptysis, bronchial artery embolisation may be beneficial, even though evidence is lacking . There is limited evidence to suggest that antifibrinolytics can help reduce the duration of bleeding .
A high incidence of pulmonary arterial (PA) thrombosis and strokes has been reported in ES [4, 14]. PA thrombosis is thought to be associated with ventricular dysfunction, and sluggish pulmonary artery blood flow, rather than solely coagulation abnormalities . The incidence of stroke is also significantly higher in PAH-CHD patients compared to the general population, especially at a younger age . Despite the increased risk of embolic events, there are no data to support anticoagulation or antiplatelet treatment in ES, unless additional indications exist in the absence of significant haemoptysis, such as PA thrombosis, arrhythmia, embolic events, severe congestive heart failure .
Hyperuricaemia, is more common in ES, with serum levels of uric acid related directly to the degree of erythrocytosis . When the elevation of the blood uric acid persists over a long period of time, it can result in precipitation and deposition of urate crystals in the joints and surrounding tissues. The incidence of gout increases with time and is more frequent in patients with co-existing renal disease. Patients should be encouraged to remain adequately hydrated and reduce the intake of purines in their diet. Non-steroidal anti-inflammatory drugs, which can cause sodium and fluid retention and may precipitate heart failure and renal dysfunction in ES patients, should be avoided. In acute attacks, the prompt use of colchicine is recommended although patients should be warned that this is likely to cause diarrhoea. Once the acute phase has resolved, allopurinol can be used to reduce the risk of recurrent gout . The dose of allopurinol should be increased to achieve a serum urate level of < 300 μmol/L. .
Cholelithiasis and asymptomatic gallstones are also more prevalent in the ES population, occurring in more than one third of patients with chronic cyanosis . General or regional anaesthesia and sedation carry significant risks in these patients and essential surgery should be performed in tertiary centres with CHD and PAH expertise.
Chest pain in patients with PAH-CHD may be related to a variety of causes, including right ventricular ischaemia, coronary artery compression due to enlarged pulmonary arteries and coronary artery disease. It is also important to consider gastro-oesophageal reflux as a potential cause for chest pain, as this is a common side effect of the phosphodiesterase 5 inhibitors used to treat PAH.
Arrhythmias may develop as a consequence of the underlying heart defect or as a sequela of interventions and are an important cause of morbidity and mortality in the PAH-CHD [20, 21] population. Compared to the general population atrial fibrillation occurs at a younger age in CHD patients and may be present in almost two-thirds of these patients [22, 23], considerably increasing the risk of stroke and heart failure. Chronic oral anticoagulation should, therefore, be considered in adult congenital heart patients with a history of atrial fibrillation/flutter . Antiarrhythmic therapy with amiodarone can be effective in almost half of the patients but they require careful monitoring as systemic side effects and pro-arrhythmic effects are of concern . Direct current cardioversion, with appropriate anticoagulation, should be considered in all PAH-CHD patients, especially those with advanced disease and high ventricular rates in whom haemodynamic instability can occur soon after the onset of arrhythmia [25, 26]. Catheter ablation should be considered for patients with persistent or recurrent arrhythmias but this should be performed in centres that have experience in CHD electrophysiology procedures. It is always preferable, from a haemodynamic point of view, to obtain rhythm rather than rate control of atrial fibrillation and other arrhythmias in CHD .
Subclinical hypothyroidism is a common finding in cyanotic CHD and also appears to be associated with cyanosis and age . As patients with CHD are three times more likely than the general population to develop mild hypothyroidism , regular thyroid evaluation is recommended, as this can develop into overt hypothyroidism. Individuals with Down syndrome are at an increased risk of developing thyroid disease, primarily autoimmune, with a lifetime prevalence ranging from 13 to 63% . Patients with PAH-CHD who have been given iodine-based contrast media or are taking amiodarone require more frequent screening, as both an under and over-active thyroid can exacerbate symptoms and lead to heart failure.
Erythrocytosis and hypoxia can lead to early renal tubular injury . Renal function is also affected by low cardiac output which is common in PAH-CHD patients and the incidence and severity of renal dysfunction increases with age. Mortality is 3-fold higher than normal in the 1 in 11 patients who have moderate or severe glomerular filtration rate reduction . Care should be taken with nephrotoxic drugs and contrast agents. Patients should be advised to maintain adequate hydration at all times.
Prevention of complications
It is recommended that all patients are screened for metabolic syndrome as this is more common among adults with CHD than the general population , cyanotic patients however appear to be protected from coronary atherosclerosis . Patients with PAH-CHD may be predisposed to obesity due to exercise limitation, and this is more pronounced in patients with Down syndrome . A higher BMI was, however, associated with better prognosis in symptomatic CHD patients in one study, especially those with complex underlying cardiac defects, which suggests that cardiac cachexia may play a role in this population . All patients with PAH-CHD should therefore be encouraged to maintain a healthy well-balanced diet and maintain a normal body weight.
Exercise capacity is reduced in PAH-CHD compared to normative standards and this significantly affects quality of life [36,37,38]. Mild to moderate activities seem to be beneficial  and patients should be encouraged to maintain fitness by remaining active within their own abilities, minimising the use of wheelchairs or other aids wherever possible . Strenuous or extreme isometric efforts can be dangerous and should be discouraged . Results from formal exercise programmes have shown an improvement in 6 min walk distance, minimum haemoglobin oxygen saturation and functional class .
Infections can destabilise patients with PAH-CHD. Patients should, therefore, be encouraged to maintain good dental hygiene and have regular check-ups to avoid endocarditis, following local guidelines with regards to endocarditis prophylaxis. Unless there are specific contraindications, they should also receive annual influenza vaccinations and be vaccinated for chicken pox if appropriate. Pneumococcal vaccinations are essential as a recent large population study showed that pneumonia is the second leading cause of death in adults with CHD [40, 41].
Maternal death rates for patients with PAH remain high in the developed world ; in the PAH-CHD population the current risk of death is 28%  and is thus pregnancy is contraindicated . Mandatory effective contraception is recommended . Appropriate counselling and care, including psychological support, should therefore be part of the routine management of all women with PAH-CHD of reproductive age. Women who do become pregnant should be counselled and if they decide to continue their pregnancy, they should be optimally treated with PAH therapies (avoiding endothelin receptor antagonists due to increased teratogenic risk). There needs to be effective close collaboration between obstetricians and the PAH team  with a planned elective delivery and high dependency observation and care post-delivery for an extended period.
Non-cardiac surgery under general anaesthesia and even sedation should be avoided whenever possible [46, 47]. When essential, invasive procedures should be planned carefully and performed in centres with appropriate cardiac, pulmonary hypertension, anaesthetic and intensive care unit (ICU) expertise  and it is advisable that all PAH-CHD patients are monitored carefully for several hours or days after any invasive procedure in an intensive care setting . In patients with right-to-left shunts, care should be taken to use air filters for all intravenous infusions to prevent air emboli.
Patients with PAH-CHD should receive lifestyle counselling. They should avoid smoking and excess alcohol, as this is associated with an increased risk of arrhythmias and heart failure , and they should be encouraged to maintain a well-balanced diet.
Social and psychological
The physical impact of PAH-CHD and especially ES, including cyanosis, finger clubbing and severely decreased exercise tolerance, can compromise social functioning . Adults with CHD generally perceive themselves to have more poor health, exercise tolerance and quality of life than their peers without CHD . It is, therefore, recommended that patients receive individualised consultations covering the type and intensity of physical activities which are safe, including those related to travel, hobbies, and sexual activities . This is important as an improvement in exercise capacity and fitness has the scope of improving quality of life by enabling participation in social activities, while also aiding to combat obesity and its potential complications, such as sleep apnoea .
Patients with PAH-CHD may travel for holiday or work but care needs to be taken to ensure that they have comprehensive travel insurance and emergency access to adequate medical care. They should avoid destinations with extremes in temperature or altitude or where they need to walk for long periods in a hilly terrain. They should be advised not to take part in extreme sports and to avoid hot tubs and saunas. The majority of patients with ES do not require supplemental oxygen during commercial flights . Traditional fitness-to-fly tests are difficult to interpret and do not seem to apply in cyanotic patients who are well adjusted to oxygen saturation fluctuations even with mild physical activities , as they have a blunted response to hypoxaemia.
Intimate relationships may be challenging for some adults with PAH-CHD due to lower body esteem, decreased sexual esteem and more distress during sex . Sexual functioning can be impaired in adults with CHD, and there is a higher incidence of erectile dysfunction . When problems are identified, sex and relationship counselling can be considered.
Patients with PAH-CHD are more likely to develop anxiety and depression , with a decreased quality of life and low self-esteem. The traditional belief that survival prospects in PAH-CHD patients are far superior compared to other PAH aetiologies is not supported by recent studies [51, 52] and this leads to uncertainty about the future. It is important that psychological assessment is part of the routine care for the PAH-CHD population, and that issues are addressed by their specialist team or referral made for local support and management.
The PAH-CHD team can liaise with the employers of patients to ensure that, where possible, adjustments can be made to the work environment, such as designated parking spaces, offices on the ground floor or reduced hours to allow patients to continue to work and maintain an income. When this is not possible, it is essential that they are signposted to the health and income related benefits for which they (and their carers) may be eligible.
Patients should be referred to relevant patient associations (PH and ACHD), that not only provide excellent information, but also a social network and support groups for patients and their carers.
Over the past 15 years the development of PAH disease targeted therapies has led to improved symptom control and life expectancy for many patients with PAH-CHD. Patients now live for several decades, but due to the complexity of the disease with high morbidity and mortality levels they should be managed in expert centres delivering a holistic approach to ensure the best possible outcomes.
Availability of data and materials
Congenital heart disease
Intensive care unit
Pulmonary arterial hypertension
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About this supplement
This article has been published as part of Journal of Congenital Cardiology Volume 4 Supplement 12,020: Unmet needs in Pulmonary Hypertension associated with Adult Congenital Heart Disease (ACHD-PH). The full contents of the supplement are available at https://jcongenitalcardiology.biomedcentral.com/articles/supplements/volume-4-supplement-1.
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Gin-Sing, W. General management of pulmonary arterial hypertension associated with adult congenital heart disease. J Congenit Heart Dis 4, 17 (2020). https://doi.org/10.1186/s40949-020-00044-w
- Pulmonary arterial hypertension
- Congenital heart disease
- Holistic care
- Chronic cyanosis
- Eisenmenger syndrome