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The global burden of paediatric heart disease

Published online by Cambridge University Press:  04 December 2017

Ndidiamaka L. Musa*
Affiliation:
Department of Pediatrics, University of Washington, Division of Paediatric Critical Care Medicine, Seattle Children’s Hospital Seattle, Seattle, Washington, United States of America
Vibeke Hjortdal
Affiliation:
Department of Cardiothoracic Surgery, Institute of Clinical Research, Aarhus University Hospital, Aarhus, Denmark
Bistra Zheleva
Affiliation:
Children’s HeartLink, Minneapolis, Minnesota, United States of America
Indah K. Murni
Affiliation:
Department of Pediatrics, Dr Sardjito Hospital/Faculty of Medicine, Universitas Gadjah Mada, Yogyakarta, Indonesia
Shunji Sano
Affiliation:
Division of Pediatric Cardiothoracic Surgery, University California San Francisco, Paediatric Cardiac Center, Benioff Children’s Hospital, San Francisco, California, United States of America
Steven Schwartz
Affiliation:
Departments of Critical Care Medicine and Pediatrics, University of Toronto, The Hospital for Sick Children, Toronto, Ontario, Canada
Sandra L. Staveski
Affiliation:
Cincinnati Children’s Hospital Medical Center, Research in Patient Services, Cincinnati, Ohio, United States of America
*
Correspondence to: N. L. Musa, MD, FCCM, Department of Paediatrics, University of Washington, Division of Paediatric Critical Care Medicine Seattle Children’s Hospital, 4800 Sand Point Way NE, FA.2.112, PO Box 5371, Seattle, WA 98145, United States of America. Tel: 206 987 2140; Fax: 206-987-3866; E-mail: Ndidi.Musa@seattlechildrens.org
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Abstract

An estimated 15 million children die or are crippled annually by treatable or preventable heart disease in low- and middle-income countries. Global efforts to reduce under-5 mortality have focused on reducing death from communicable diseases in low- and middle-income countries with little to no attention focusing on paediatric CHD and acquired heart disease. Lack of awareness of CHD and acquired heart disease, access to care, poor healthcare infrastructure, competing health priorities, and a critical shortage of specialists are important reasons why paediatric heart disease has not been addressed in low resourced settings. Non-governmental organisations have taken the lead to address these challenges. This review describes the global burden of paediatric heart disease and strategies to improve the quality of care for paediatric heart disease. These strategies would improve outcomes for children with heart disease.

Type
Original Articles
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© Cambridge University Press 2017

Efforts at reducing mortality among children under 5 years of age have been the focus of significant international attention for decades, beginning with the convention on the rights of the child and accelerating in 2000 with the Millennium Development Goals, with goal 4 being to reduce the under-5 mortality rate by two-thirds. This work continued with the United Nations’ adoption of the Sustainable Development Goals, specifically Sustainable Development Goal 3, which aims to end preventable deaths of newborns and children under 5 years of age. All countries aimed to reduce neonatal mortality to at most 12 per 1000 live births and under-5 mortality to at most 25 per 1000 live births. 1, Reference Forouzanfar, Afshin and Alexander 2 These efforts have been largely targeted at prevention and treatment of communicable diseases, owing to the number of affected children and the relatively low cost, low technology, and experience required to do this work. Overall, progress has been achieved with a reduction in global mortality. However, it is notable that CHD and acquired heart diseases, which affect a significant number of children, have largely been left to non-governmental organisations to address. This is probably because of perceived challenges around cost, technology, availability of trained personnel, and the expertise required to affect change.Reference Penny 3

In the past 50 years, there have been major breakthroughs in cardiovascular care such as improvements in diagnosis and surgical treatment. Survival of newborns with CHD has increased considerably in high-income countries. Unfortunately, this is not the case in many low- and middle-income countries where the burden is the heaviest and rates of death and disability continue to rise.Reference Zheleva and Atwood 4 Until recently, the global dialogue about the endemic burden of cardiovascular disease among the world’s poorest billion people was not addressed, yet globalisation has affected behavioural and metabolic risk factors for cardiovascular disease. It is important to note that the causes of heart disease in high-income countries are different from those in low- and middle-income countries, where ischaemic heart disease is relatively infrequent and hypertensive heart disease, cardiomyopathies, rheumatic heart disease, pericardial disease, and CHD are common.Reference Kwan, Mayosi and Mocumbi 5 Additionally, rheumatic heart disease has been virtually eliminated from high-income countries but remains a significant public health issue in low- and middle-income countries and is the leading cause of acquired heart disease.Reference Zühlke, Mirabel and Marijon 6 Thus, paediatric heart disease, both congenital and acquired, remains a major health problem in low- and middle-income countries.Reference Nguyen, Leon-Wyss, Iyer and Pezzella 7

With globalisation and accessibility of echocardiography, the inequalities of access to care are being recognised. Recent history suggests that these barriers are becoming less formidable. Excellent outcomes can be achieved even with low-cost cardiovascular care in challenging environments, India being a leading example. We are learning that specific lesions with excellent long-term prognosis, such as atrial and ventricular septal defects, and tetralogy of Fallot can be managed very well in the vast majority of cases, even when the advanced care and rescue capabilities present in high-income countries are not available.

Incidence and prevalence of paediatric heart disease

Congenital anomalies are a major cause of infant mortality, and children who survive often live with significant life-long disabilities. About 3% of all live births are associated with congenital anomalies.Reference Higashi, Barendregt and Vos 8 According to the 2010 global burden of disease, injuries, and risk factors study, ~302,000 infants died from congenital anomalies, which accounted for 6% of all infant deaths, with 96% of these occurring in low- and middle-income countries.Reference Murray, Vos and Lozano 9 About 28% of all major congenital anomalies are heart defects.Reference van der Linde, Konings and Slager 10

Most of the data about CHD globally are extrapolated from high-income countries, and quality regional data from low- and middle-income countries are lacking. Adequate documentation of births and mortality is essential to drive a policy shift that would affect access to care for children with heart disease and to fight the perception that CHD rates in low- and middle-income countries are lower than in high-income countries. CHD has an estimated prevalence of 10–12 per 1000 live births and represents ~1.35 million live births each year.Reference Hoffman 11 Reported figures vary worldwide, and a meta-analysis by van der Linde found that the highest CHD birth prevalence was in Asia, 9.3 per 1000 live births, and the lowest in Africa, 1.9 per 1000 live births.Reference van der Linde, Konings and Slager 10 The prevalence of CHD in low- and middle-income countries, especially in Africa, is underestimated owing to a paucity of data, lack of prioritisation of cardiac care services, access to care in general, poor health infrastructure, lack of trained personnel, limited resources, and early mortality.

To the extent that there are reliable studies, they corroborate that rates are similar across the world. A study of 20,307 newborns in India found an overall CHD birth prevalence rate similar to that reported worldwide, at 8.07/1000 live births (95% CI 6.94–9.4).Reference Saxena, Mehta and Sharma 12 Another study from China showed similar results, with 686 having CHD in a cohort of 84,062 births, resulting in an overall incidence of 8.2/1000 total births.Reference Qu, Liu and Zhuang 13 To the best of our knowledge, rates of CHD in low- and middle-income countries are similar to high-income countries and may be higher.

With regard to outcomes, about half of all deaths among children with CHD occur during the first year of life, especially in countries where access to surgery is limited.Reference Hewitson and Zilla 14 In addition, children with CHD that present late frequently suffer from poor nutrition, pulmonary congestion, and pulmonary hypertension, which in turn predisposes these children to pneumonia and sepsis, all of which is challenging to manage in settings with limited resources.

Rheumatic heart disease remains a global health problem in low- and middle-income countries. According to the benchmark estimates of the burden of disease, there are 15.6 million prevalent cases, 282,000 incident cases, and 233,000 deaths attributable to rheumatic fever or rheumatic heart disease annually.Reference Wyber, Zühlke and Carapetis 15 Recent studies in school children have reported the prevalence as high as 21.5–30.4 cases per 1000.Reference Marijon, Tivane and Voicu 16 Reference Saxena 18 Furthermore, the disability-adjusted life year burden was estimated at 1430 (range 944–2067) in 2010.Reference Wyber, Zühlke and Carapetis 15 These are conservative estimates and the true burden of disease is thought to be even greater. A recent study described mortality rates that were higher than those of rotavirus, meningitis, hepatitis B, and half of those with malaria.Reference David 19 The true burden is probably underestimated because of methodological differences between studies and lack of echocardiographic detection of asymptomatic disease.Reference Zühlke and Steer 20 Additionally, there was a lack of published data from low- and middle-income countries where the burden of disease is the highest.Reference Jackson, Steer and Campbell 21 Previously published studies on prevalence or incidence of rheumatic heart disease were conducted mostly in urban areas, although the prevalence of rheumatic heart disease may be higher in rural areas.

The significance of potentially fatal sequelae of rheumatic heart disease remains under-explored. A previously published study involving 12 African countries, India, and Yemen showed a high prevalence of major cardiovascular complications related to moderate-to-severe multivalvular disease including congestive heart failure, pulmonary hypertension, atrial fibrillation, stroke, infective endocarditis, and major bleeding.Reference Zuhlke, Engel and Karthikeyan 22 In addition, a systematic review consisting of 16 studies in South Africa revealed that the overall 60-day mortality after admission with acute heart failure due to rheumatic heart disease was 24.8% (95% CI, 13.6–42.5%), and 180-day mortality was 35.4% (95% CI, 21.6–54.4%).Reference Zühlke, Engel, Watkins and Mayosi 23 Zühlke et al found, in 3343 children and adults from 14 low- and middle-income countries, that the 2-year case fatality rate was 16.9%, median age at death was 28.7 years, and complications of congestive heart failure and stroke affected one-fifth of patients over 2 years of age.Reference Zühlke, Karthikeyan and Engel 24 Thus, programmes focusing on early detection and treatment of clinical rheumatic heart disease are required to improve outcomes.

Secondary prophylaxis has been proven to be cost-effective in controlling rheumatic heart disease as repeated streptococcal infections are thought to prime a susceptible individual and result in a heightened response to an infection from rheumatogenic streptococcus, which in turn drives the valvular inflammatory response. However, most low- and middle-income countries still do not have effective secondary prophylaxis programmes. Furthermore, rheumatic heart disease can go undetected and result in patients presenting with debilitating heart failure. At this stage, surgery is the only possible treatment option. In low- and middle-income countries, limitations of human resources and facilities for cardiac surgery and post-operative management may adversely affect the outcomes of the paediatric cardiac surgery for these children. Finally, providing anticoagulation services in low- and middle-income countries after surgery is problematic.

Addressing the global burden

There are important considerations in addressing this burden. The first step is recognising the contributing factors. The care of children with CHD and rheumatic heart disease in low- and middle-income countries settings is challenging. Most CHD are not diagnosed before birth owing to lack of antenatal screening. Early diagnosis of simple lesions could result in early referral and treatment before the onset of irreversible sequelae. Other factors that contribute include limitations in the existing infrastructure, lack of resources, low numbers of appropriately trained healthcare workers, and a general lack of awareness of heart disease in children. Meeting these challenges requires clinical evidence pertinent to the local settings, an adequate number of well-trained personnel, improvement in nursing and medical education, research, and quality improvement activities. In addition, there is increasing realisation that the lack of facilities for sustainable paediatric cardiac services in low- and middle-income countries results in a massive number of preventable deaths and ongoing suffering. It is estimated that 15 million children die or are crippled annually by potentially treatable or preventable cardiac disease.Reference Yacoub 25 Paediatric cardiovascular services are highly specialised and require significant financial resources. In high-income countries where the national needs of paediatric cardiac surgery are met, around 450 interventional treatments or surgical procedures for CHD are done yearly per 5 million inhabitants.Reference Larsen, Olsen and Emmertsen 26 In low- and middle-income countries, with 3–4 times the birth rate and with the additional need for surgical treatment for rheumatic heart diseases, the need for cardiovascular services is much greater.Reference Qu, Liu and Zhuang 13 The work led by non-governmental organisations has shown that these barriers in training and organisation can be overcome, but it will take a very long time to do this with current models.

Access to cardiac care

In the poorest parts of Africa, Asia, and South and Central America, there are limited paediatric cardiovascular services. Some of the larger cities have facilities for diagnosis and intervention and operation of selected and straightforward conditions in children beyond infancy. Infant and newborn open heart surgery is limited, if present at all. Requirements for developing a sustainable and comprehensive paediatric cardiovascular service are demanding and need significant resources. The treatment of the four most common CHD – atrial and ventricular septal defects, patent ductus arteriosus, and tetralogy of Fallot – covers approximately half of the need. The children can be treated on an elective basis, transported over long distances to a facility, and the heart disease is likely resolved, at least for several years or even decades, with one operation or intervention. Open heart surgery and catheter interventions of newborns and infants require a major increase in resources, infrastructure, and expertise among physicians, nurses, paramedics, and families.

Expenditure

Health expenditure is a large part of the gross domestic product in high-income countries compared with the tiny fraction it is in most low-income countries. There is great disparity in access to paediatric cardiovascular services worldwide. Many countries struggle to meet basic primary health needs, therefore making it impossible to provide tertiary paediatric cardiovascular services.Reference Leblanc 27 There are strategies such as developing partnerships through non-governmental organisations and governments and humanitarian outreach that are helping to defray costs while building capacity and sustainable programmes. In total, 58% of the burden of disease of CHD could be averted by scaling up selected surgical care in low- and middle-income countries through various mechanisms.Reference Debas, Donkor, Gawande, Jamison, Kruk and Mock 28 The experience of high-income countries has shown that, as economies grow and health systems strengthen, childhood mortality from preventable diseases starts to decline, and CHD surfaces as one of the top contributors to neonatal and under-5 mortality. The World Bank predicts that the world is very close to achieving the 2030 goal of eliminating poverty, and it is likely that many countries will emerge with a significant and growing burden of childhood heart disease. 29

Building human capacity

Sub-Saharan Africa carries over 24% of the global disease burden but is home to only 3% of the global health workforce, in sharp contrast to North America with only 10% of the world disease burden but 37% of the global health workforce.Reference Anyangwe and Mtonga 30 This inequity represents one of the greatest impediments to healthcare in Sub-Saharan Africa. In addition, Africa has been plagued by a high attrition rate of qualified staff and significant migration of healthcare professionals, either to richer nations or to local private organisations for higher remuneration, better career opportunities, and improved working environment. There is a great need for healthcare workers to be trained, sustained, and retained in Sub-Saharan Africa and other low- and middle-income countries.Reference Zühlke, Mirabel and Marijon 6 The international strategies to provide help to children with CHD in low- and middle-income countries come mainly from non-governmental organisations. Voluntary and humanitarian initiatives have centred around transporting children with heart disease to high-income countries, treating children during surgical missions, and long-term humanitarian training exchanges that help to develop sustainable cardiovascular centres. The real benefits from the first two strategies are variable as only a small number of children can be served, they are associated with high costs, and may not be sustainable. In addition, these efforts have been criticised as a form of medical tourism. Kingham et al described the number and cost of short-term medical missions and training exchanges from the United States to low- and middle-income countries at 6000, with an associated cost of United States $250 million, but with no exact figures on the quality and quantity of these sessions.Reference Kingham, Price, Casey, Rogers and Kushner 31 Currently, non-governmental organisations recognise the need to build sustainable programmes locally through training and empowerment of the local team, rather than saving individual children by bringing them to institutions in high-income countries.

Building cardiovascular centres through a sustained strong international partnership is a key strategy to build, strengthen, and maintain competence of healthcare workers.Reference Leblanc 27 The paediatric cardiac unit in Guatemala City is an excellent example of a sustainable programme that was established through a joint venture between the Aldo Castaneda Foundation, the government of Guatemala, and donations from abroad that have trained cardiac surgeons in the country and region.Reference Saxena 18 Another example is the partnership between Children’s National Health System (Washington, DC) and Samaritan’s Purse Children’s Heart Project, which developed the Ugandan Heart Institute.Reference Aliku, Lubega and Namuyonga 32 Dearani et al outlined principles for building successful partnerships in low- and middle-income countries as “a commitment to work together in the spirit of collaboration, to track and measure results, to establish and designate an acceptable structure and to build local government and community support.”Reference Dearani, Neirotti and Kohnke 33

Building infrastructure

Educating government and community leaders about prevention and treatment of paediatric heart disease is imperative because building sustainable cardiovascular services is complex and expensive.Reference Yacoub 25 Building high-quality cardiovascular services in low- and middle-income countries requires intensive coordinated efforts, infrastructure development, identification of key stakeholders, and building collegial relationships for ongoing consultation and mentorship. Infrastructure development requires a significant amount of capital, building new or renovating old facilities, purchasing equipment, support services such as pharmacy, blood bank, operating rooms, and intensive care resources, and, most importantly, human resources.Reference Yacoub 25

Research and quality improvement

Encouraging quality improvement and research to define the scope of the problem, resources available, and best strategies are needed. Reddy et al published a report on the effect of preoperative determinants on early outcomes of 1028 consecutive infant heart operations in India.Reference Reddy, Kappanayil and Balachandran 34 The International Quality Improvement Collaborative for Congenital Heart Surgery in Developing World Countries is an initiative allowing paediatric cardiovascular centres from low- and middle-income countries to work together to lower congenital heart surgery mortality. To date, 58 sites from 24 countries have entered 60,607 cases in the International Quality Improvement Collaborative for Congenital Heart Surgery in Developing World Countries patient registry. Teams also benefit from free participation in monthly educational webinars from Boston Children’s Hospital on topics such as team-based practice, infection prevention, and safe perioperative practices. Current International Quality Improvement Collaborative for Congenital Heart Surgery in Developing World Countries data show that participating hospitals were able to lower infection rates and mortality.Reference Jenkins, Castañeda and Cherian 35

Conclusion

In its advocacy series, The Invisible Child, Children’s HeartLink highlighted several important recommendations that multilateral and financing agencies, the World Health Organization, national and local governments, research and teaching institutions, non-governmental organisations, patient and family advocates, and the private sector need to undertake to ensure that children around the world have access to quality and sustainable paediatric care close to where they live. The recommendations focus on the following:

  • Investments in increasing capacity at all levels of the healthcare delivery system to screen, diagnose, and treat children with heart disease,

  • Building accredited paediatric cardiac training programmes in all regions globally to assure systematic recognition of the basic signs and symptoms of CHD and rheumatic heart disease,

  • Improve surveillance through systematic data collection on paediatric heart disease in national health surveys and include burden of disease and cause of child death statistics, and

  • Ensuring that paediatric cardiac care will be included in benefits packages in universal health coverage and social protection platforms, and protecting patients from unaffordable expenses related to their care. 36

We think that is it appropriate for global health agencies to consider CHD and acquired heart disease as targets for improving access to care worldwide, given the great potential for life-time benefit.

Acknowledgements

None.

Financial Support

This paper received no specific grant from any funding agency, commercial, or not-for-profit sectors.

Conflicts of Interest

None.

References

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