Purpose of Review
In addition to concerns with physical health and activity levels, children with cardiac conditions can be at risk of neurodevelopmental and socioemotional maladjustment. Children with congenital heart defects requiring surgery early in life are at risk of developmental delays and cognitive impairments, and both children with congenital heart defects and those with cardiomyopathies are at risk of socioemotional concerns. As a result, there is an increasing focus on rehabilitation efforts for these patients, in order to improve both their physical well-being and their adjustment outcomes. However, there are no established standards for rehabilitation programs applicable across children with cardiac conditions, in stark contrast to guidelines for adult patients. The purpose of the present review is to summarize recent studies on pediatric cardiac rehabilitation and describe the structure of our own program, in order to aid with the delineation of future guidelines.
Twenty programs for pediatric cardiac rehabilitation were identified and reviewed. We review inpatient, outpatient, and home-based programs, most of which include two to three sessions of exercise training per week for 12 weeks with a focus on improving exercise capacity. We also review emerging cognitive rehabilitation for children with cardiac disorders and discuss a newly developed program at our own institution.
A review of past findings, along with recent efforts at our institution, suggests that a structured cardiac rehabilitation program can benefit children by increasing exercise response and physical activity as well as improving developmental, cognitive, and psychosocial outcomes.
Children with cardiac disorders are at risk of neurodevelopmental and socioemotional maladjustment [1,2,3,4], on top of concerns with their physical health and activity levels. As a result, there is an increasing focus on rehabilitation efforts for these patients, in order to improve both their physical well-being and their psychosocial adjustment. However, there are no established standards for rehabilitation programs applicable across children with cardiac conditions, in stark contrast to guidelines for adults . In this review, we summarize recent studies on pediatric cardiac rehabilitation and present the structure of our own center’s program, in order to aid with the delineation of future guidelines for pediatric patients.
Pediatric Cardiac Disorders
Congenital Heart Defects
Congenital heart defects (CHDs) are one of the most common birth defects, affecting approximately 1.35 million newborns worldwide every year  and 1 million children of all ages in the USA . CHDs encompass a wide range of conditions in which there is abnormal development of the heart and/or its major blood vessels; they are broadly categorized into cyanotic defects (where oxygen-rich and oxygen-poor blood mix) and acyanotic defects (where the amount of oxygen delivered throughout the body is unaffected). A summary of heart defects is provided in Table 1, with abbreviated details on clinical presentation and management.
Children with CHDs can have comorbid pulmonary and other medical complications hindering their ability to function [8, 9], and they are at risk of delays in motor development and exercise intolerance [10, 11]. Impairments in motor functioning and exercise tolerance, in turn, have been linked with perioperative morbidity and sedentary behaviors (which can have negative health consequences) . Along with their physical impairments, children with CHDs are more likely to have parents, educators, and health providers who excessively limit their activity, predisposing them to physical inactivity and exercise intolerance . They may, therefore, benefit from cardiac rehabilitation with an emphasis on increasing physical activity and providing relevant education.
Children with CHDs are also at increased risk of early developmental delays, later cognitive dysfunction, and poor quality of life, including speech and language delays, deficits in attention, executive functioning and visuospatial skills, and emotional and behavioral dysregulation [1, 2]. Neurodevelopmental disruptions are thought to result from a combination of brain dysmaturation [14,15,16] (which likely arises from genetic factors and teratogens that concurrently impact cardiac and cerebral fetal development [17, 18]), altered cerebral perfusion (which can then affect functional and structural brain development) , and neurological injuries (i.e., cerebral hemorrhages, ischemic lesions, periventricular leukomalacia, and other white matter injuries) [20, 21]. The complexity of the heart defect has been related to the severity of neurodevelopmental concerns, with children with single ventricle lesions thought to be at particular risk . Even with simpler defects, though, factors such as cardiac arrest  and extracorporeal membrane oxygenation (ECMO)  can portend increased risk of neurodevelopmental delay. As such, children with CHDs may benefit from access to habilitation and rehabilitation services, during acute care following surgical interventions, cardiac arrest, and ECMO but also follow-up interventions for functional impairments or developmental delays that emerge throughout childhood.
Cardiomyopathies occur in fewer than 2 per 100,000 children [24, 25]. Cardiomyopathies are abnormalities of the ventricular myocardium that cannot be explained by abnormal loading conditions or heart defects; they can result from coronary artery abnormalities, tachyarrhythmias, exposure to infection or toxins, or other underlying disorders . There are several subtypes of cardiomyopathies, summarized in Table 2 along with their presentation and management.
In many children with cardiomyopathies, the disorder progresses to the point where medications and surgical options are ineffective. Nearly 40% of children with symptomatic cardiomyopathy require a heart transplant or die [27, 28]. The time to transplant or death for children with cardiomyopathy has notably not improved over the past several decades, and the most economically advanced nations have no better survival outcomes than developing nations . Rehabilitation programs may be beneficial, not to cure the diseases, but to potentially improve the cardiac function and the overall health of children for whom options for care are limited [30••].
Children with cardiomyopathies, particularly those who progress to heart failure, have an increased risk of anxiety, depression, and quality of life concerns [3, 31••]. In addition, those who require permanent ventricular assist devices or heart transplantation can have mild neurodevelopmental disruptions [4, 32]. Among adults, cardiac rehabilitation programs have yielded success in improving not only cardiac function and overall physical activity but also emotional well-being and quality of life. Children may similarly benefit from rehabilitation programs.
Per the Registry of the International Society for Heart and Lung Transplantation , there are approximately 400 to 600 cases of pediatric heart transplantation per year, worldwide. CHDs are the most common indication for transplant during infancy (55% of cases), followed by cardiomyopathies (37%). However, for children over age 10, cardiomyopathies are the most common indication (43–54% dependent on age). The median post-transplant survival is approximately 22 years for those transplanted in infancy, approximately 18 years for those in early childhood (age 1–5 years), approximately 14 years for those in middle childhood (age 6–10 years), and 13 years for those in adolescence.
Cardiac transplantation results in postganglionic denervation, leading to the inability to respond to the parasympathetic nervous system . In turn, there are higher systolic and diastolic blood pressures, elevated heart rate at rest, lower maximal myocardial oxygen consumption, lower heart rate reserve, and decreased exercise duration. Because of these physiologic changes, cardiac rehabilitation can be helpful in reestablishing physical health and activity levels.
Heart transplantation in infancy and toddlerhood has been associated with mild delays in motor and cognitive development, with a similar pattern of deficits as seen with children with CHDs requiring surgery other than transplantation early in life . Specifically, this group can display mild reductions in motor skills, intellectual abilities, language abilities, and visuospatial skills. Older children, who often undergo a heart transplant for cardiomyopathy, can display mild cognitive deficits and are, more importantly, at risk of internalizing and externalizing distress . Among children who undergo heart transplantation, cardiac rehabilitation may be particularly important not only to help pediatric patients regain their strength and mobility in the short term but also to help maximize children’s quality of life across their reduced lifespan.
Pediatric Cardiac Rehabilitation
Guidelines from the American Heart Association and the American Association of Cardiovascular and Pulmonary Rehabilitation recommended that cardiac rehabilitation programs for adults and older adults include several core components including a baseline assessment, management of health risk factors (e.g., diabetes, hypertension, lipid levels) and nutrition, exercise training and physical activity counseling, and psychosocial management [37,38,39]. Similarly, primary goals for pediatric cardiac rehabilitation are managing physical health and activity as well as socioemotional functioning. Given the key developmental tasks of childhood, such as gaining basic academic skills, there may be an additional focus on mitigating developmental and cognitive disruptions, which would not be a primary concern during adult cardiac rehabilitation.
Addressing Physical Health and Activity
Historically, there have been concerns regarding the adverse effects of physical activity in those with cardiac conditions. However, research has underscored that exercise is not necessarily contraindicated. For example, a large study among adults with CHDs demonstrated that the majority of sudden cardiac events in patients occurred at rest (69%), with 11% during sleep, and only 10% during exercise . In fact, physical activity can be beneficial for those with cardiac conditions. There is overwhelming evidence that exercise training within adult cardiac rehabilitation promotes cardiorespiratory fitness, strength, flexibility, and metabolic health; reduces morbidity, mortality, and hospital admissions; and improves quality of life [41•, 42•]. Emerging research with pediatric populations with cardiac conditions similarly suggests that exercise training can have beneficial effects, although there is some variability in effects [43, 44].
Given its potential benefit, exercise training has been outlined as a key component of cardiac rehabilitation with adult patients [37,38,39], recommended in guidelines for certain pediatric cardiac populations (e.g., those with heart failure), and has consistently been included in emerging programs with children [30••, 43,44,45]. From prior reviews of cardiac rehabilitation programs for children with CHDs or cardiomyopathies [30••, 43, 44], it has generally been recommended that programs have a duration of at least 12 weeks, with two to three sessions per week, and sessions of at least 30 min (and up to 90 min). Programs should include aerobic, resistance, and flexibility training, with warm-up and cool-down periods. Training should be individualized based on the results of metabolic stress tests, cardiac biomarkers, echocardiograms, baseline resistance-training capacity, and past medical history. Notably, the intensity of aerobic exercise should be at a heart rate approximately equivalent to anaerobic threshold. The patient’s progress should be reviewed at least weekly, and progressive increases should be made in the child’s exercise workload as tolerated and when medically appropriate. Programs might also benefit from a 6-month maintenance period with two exercise visits per month, including a review of exercise logs. Both center-based and at-home training programs may be effective [30••].
More broadly, cardiac rehabilitation programs can provide education on appropriate physical activity in children with cardiac conditions. Physical activity has been promoted in guidelines from the American Heart Association and the Association for European Paediatric Cardiology for children with CHDs [46••, 47]. Specifically, guidelines for physical activity in children with CHDs underscore the need for at least 60 min of daily activity that is developmentally appropriate and enjoyable. Vigorous activity is recommended at least 3 days per week, and exercises for strengthening bone and muscle (e.g., high-impact and anaerobic burst exercises such as jumping) are recommended 3 days per week. However, children with certain heart defects (e.g., transposition of the great arteries, single ventricle conditions) may need to limit participation in the highest intensity activities, notably in competitive sports . As for all children, screen time should be limited to no more than 2 h per day for children over the age of 5 years, and children under the age of 3 years should not have any screen time [46••, 47].
Guidelines from the American Heart Association and the European Society of Cardiology for individuals with cardiomyopathies also underscore the benefit of physical activity [49, 50, 51••]. Still, those with cardiomyopathies may have more restrictions in their activity. Intensive exercise programs and competitive sport may be contraindicated for certain individuals depending on their subtype of cardiomyopathy, history of symptoms, and findings on cardiac testing. More generally, patients should be advised to start exercise sessions with a warm-up period and end with a cool-down period; avoid burst exertion, preferably avoid high-intensity free weight lifting due to the risk of injury with syncope; avoid exercising in adverse environmental conditions; and exercise only in environments equipped with an automatic defibrillator.
In addition to exercise training and counseling on appropriate physical activity, pediatric cardiac rehabilitation programs can help patients and their families establish a nutrition plan and better recognize and manage the symptoms of their cardiac condition. As such, programs can promote a healthy lifestyle and decrease the risk and the severity of future cardiovascular disease.
Addressing Cognitive and Socioemotional Functioning
Cardiac rehabilitation programs can help not only mitigate the physiological effects of cardiac conditions but also enhance the socioemotional and cognitive functioning of patients. By doing so, cardiac rehabilitation programs can help children, adolescents, and young adults transition back to their family and home life, peer groups, and school and work settings following hospitalization. Although such efforts are standard in programs with adult patients, recent reviews suggested that the same cannot be said of pediatric programs, even though the omission of mental health providers may decrease the success of cardiac rehabilitation [43, 44].
Psychologists, social workers, and other licensed mental health professionals can assess the psychosocial needs of pediatric patients and their families and monitor changes in needs throughout their rehabilitation . For example, although patients have typically undergone a psychosocial evaluation prior to a heart transplant, their needs may change during the waiting period for a heart and subsequent recovery from surgery. Families may also be more likely to report sensitive information once they no longer need to be concerned that they may not be listed for a transplant because of their financial, social, or personal resources. They may also share important information once they feel more comfortable with their care team over time. As such, they may be more apt to discuss difficulty coping with their illness and medical care, negative mood, insufficient social support, and/or premorbid history of mental health concerns.
Having identified patients’ needs, mental health providers can implement interventions to foster healthy behaviors and treatment compliance and address the distress associated with critical illness and lengthy hospital stays. For instance, motivational interviewing strategies can aid with building a desire to engage in adaptive behaviors, such as taking medications and following nutrition and exercise plans [53, 54]. Strategies from behavioral management therapy can target the behavioral manifestations of distress often seen in young children, and cognitive-behavioral and mindfulness-based therapies can effectively target anxious, irritable, and depressed moods among older children and adolescent [55,56,57]. Behavioral and cognitive-behavioral therapies also offer models for chronic pain and poor sleep [58, 59]. The ability to consult psychiatric colleagues within cardiac rehabilitation programs further allows pediatric patients access to specialized psychotropic medication management when indicated.
Interestingly, psychological interventions might benefit physical health along with psychosocial health. In a meta-analysis of 23 randomized control trials involving adult patients with coronary heart disease, psychological interventions both reduced emotional distress and improved systolic blood pressure, heart rate, and cholesterol levels . Similarly, a pediatric cardiac rehabilitation program with a stress management component improved physiological measurements, although the study did not separate out the effects of exercise training, health education, and stress management . Research has also documented associations between physical and emotional health among youths who have completed cardiac rehabilitation [62•] and between daily physical activity and mental health among children with CHDs .
Cardiac rehabilitation programs can furthermore offer an opportunity to identify and address disruptions in the acquisition of developmental milestones and cognitive abilities. Developmental assessments can identify delays in motor, language, and adaptive development, and neuropsychological evaluations can identify cognitive deficits . Such testing can aid with treatment and transition planning (e.g., clarifying the need for speech and language therapy and outlining recommendations for an Individualized Education Program upon return to school).
Importantly, families of children with cardiac disorders have described the need for effective communication among health and mental health professionals, families, and schools as critical within rehabilitation programs . By incorporating mental health providers, care coordinators, and school liaisons into comprehensive cardiac rehabilitation programs, the needs of pediatric patients can be better understood and addressed by the treatment team.
As summarized in Table 3, we identified 20 cardiac rehabilitation programs described across 26 reports, with samples that included patients under age 18. Due to the limited number of studies and consistency in findings, we did not exclude programs that had both pediatric and adult patients. Similarly, we included both randomized control trials and investigations without control groups, due to the emerging nature of the literature. Programs described within case studies and unpublished manuscripts (e.g., theses, conference presentations) were excluded from the review. We only included reports written in English and papers published after 1990.
Below, we describe pediatric cardiac rehabilitation programs designed for inpatient and outpatient settings as well as home-based training. Across the different settings, programs typically adopted a team approach with physicians, rehabilitation therapists, and other health providers. Indeed, it has previously been recommended that programs include dieticians, physical therapists, and occupational therapists at minimum and be coordinated by a pediatric cardiologist and a pediatric physiatrist [30••]. Staff should be trained to handle medical emergencies, and the staff-to-patient ratio should not exceed 1 to 4 at any time, per prior recommendations [30••].
Inpatient Acute Care Rehabilitation
The literature is limited in regard to programs that include rehabilitation during the acute care hospitalization period. Still, we identified two reports describing inpatient acute care rehabilitation, one featuring patients with a ventricular assist device and one focused on patients hospitalized for heart failure [65, 66]. The programs demonstrated the safety and feasibility of an acute care model both in the intensive care setting and on a standard hospital floor, with no adverse events related to physical activity. One of the rehabilitation programs additionally documented that patients were able to achieve the therapeutic goals established for them .
We identified nine outpatient programs, described across 14 studies [61, 62•, 67,68,69,70,71,72,73,74,75,76,77, 78•]. The programs included patients as young as 8 years old; although three of the programs included young adults and one included patients as old as 40 years, they all enrolled children and/or adolescents. All of the studies evaluated effects of exercise in patients with CHDs. The duration of the programs ranged from 2 weeks to 8 months, with structured activity typically two to three times per week, typically for 30 min to 60 min per session. The programs all included some form of warm-up and cool-down periods (typically 5 min to 10 min each). All of the programs included an aerobic component to the exercise training program, and some also included strength training. All of the programs demonstrated an improvement in maximal oxygen output. Studies also reported exercise duration, metabolic equivalents, and improved quality of life. One of the programs also documented self-reported improvements in cognitive functioning and parent-reported improvements in social functioning [69,70,71,72].
Nine programs, summarized across ten reports, described home-based rehabilitation programs [79•, 80, 81•, 82,83,84,85,86,87,88]. Although the majority of studies focused on school-age and adolescent patients with CHDs, there was one program that focused on toddlers , one that included young adults , and one that enrolled patients following heart transplantation . Programs often required 8 weeks to 12 weeks of home-based exercise and included initial and follow-up sessions in person with health providers, so as to provide education on the program and monitor progress. Progress could also be monitored with digital tools, such as heart rate monitors, accelerometers, and Fitbits. Echoing the design of outpatient programs, home-based rehabilitation programs typically involved sessions of an hour or less with 5-min to 10-min warm-up and cool-down periods and focus on aerobic exercise. Although training was often associated with improved exercise capacity, better cardiorespiratory outcomes, and improved quality of life and psychosocial functioning, one study did not find significant changes in patients after the intervention [79•]. Interestingly, the program with toddlers reported improvements in gross motor functioning, daily physical activity, and family life up to 2 years later , and a program with school-age children documented improvements in exercise capacity and quality of life up to a year after the intervention . None of the programs reported significant adverse events.
The vast majority of rehabilitation programs among children with cardiac conditions have focused on exercise training, as a function of children’s complex medical needs. However, we mention one study underway to examine cognitive rehabilitation among children with cardiac conditions. Newburger  is investigating the effects of a computer-based training program to enhance the executive functioning skills of children with CHDs.
Current Directions at Our Institution
At the UPMC Children’s Hospital of Pittsburgh (CHP), we developed a cardiac rehabilitation program modeled after recommendations from previously developed programs, as described above. The program seeks to establish a reproducible and sustainable protocol for children with pediatric-onset or congenital cardiac disease, in an effort to systematically influence and mitigate the effects on physical health, neurodevelopmental outcomes, and quality of life. Specifically, the goals of the program are to (1) improve exercise function and capacity; (2) improve heart rate recovery and response to exercise; (3) decrease the effects of deconditioning; (4) improve physical function and age appropriate level of play and adaptive living; (5) improve patient and family confidence in exercise and participation in age appropriate activities; (6) promote global wellness, including an active lifestyle and healthy nutrition choices; and (7) improve overall adjustment and quality of life post transplantation.
With this framework in mind, we established multidisciplinary inpatient and outpatient cardiac rehabilitations programs, which involve medical evaluation, prescribed therapies, nutritional and physical education geared toward improving the physiologic effects of long-term cardiac illness, and consultation for developmental, neuropsychological, and psychological services. The team, headed by a pediatric cardiologist and pediatric physiatrist, also includes physical therapists, occupational therapists, speech and language pathologists, dieticians, neuropsychologists, and pediatric psychologists. This team meets at a regularly scheduled time to review patients for clinic care and to advance the cardiac rehabilitation program’s development.
Currently, our institution is targeting children on the pathway to heart transplantation for participation in pediatric cardiac rehabilitation; however, we hope to expand our program more broadly to children with CHDs and cardiomyopathies not requiring heart transplantation. The program structure includes providing a multidisciplinary evaluation prior to transplantation, including assessments from medical and therapy providers. Based on the evaluation, the team provides a cohesive set of recommendations, including a potential course of therapies prior to transplantation. Following cardiac transplantation, patients are typically engaged in a 12-week outpatient course of physical therapy three times per week (with sessions lasting between 30 and 60 min), with aerobic conditioning, resistance, and strength training. Sessions include warm-up and cool-down periods. As needed, patients are engaged in occupational therapy with a focus on adaptive skills following surgery, speech and language therapy with a focus on cognitive restructuring, and nutrition and physical activity education. These sessions can occur at facilities associated with the hospital for families that live close by; otherwise, a prescription detailing needed interventions is provided to the family to take to a facility in their community. As needed, patients are engaged in psychotherapy to aid with their psychosocial adjustment. Patients may also be referred for neuropsychological testing to determine their cognitive needs, as they return to the school and home environment; evaluations are conducted following guidelines for assessment in children with cardiac disorders [90••].
Children can benefit from pediatric cardiac rehabilitation programs from physical health and psychosocial perspectives, and more importantly, these programs can be tolerated with minimal adverse events. Although center-based programs may allow for a greater degree of refinement in individual patient goals and monitoring of their health status, the limitation of proximity to a tertiary care institution is not necessarily a barrier (particularly among children with chronic concerns, such as CHDs), as demonstrated by the efficacy of home-based programs. The home-based program has the potential to limit the burden of transportation and potentially time off work for parents who bring their child to a facility for training. Still, home-based programs should continue to be monitored by both a cardiologist and a pediatric physiatrist. Further research is needed to demonstrate sustained long-term benefits of interventions, to understand the impact on quality of life for the family system, and to explore long-term impact of cognitive interventions within pediatric cardiac rehabilitation programs.
Papers of particular interest, published recently, have been highlighted as: • Of importance •• Of major importance
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Akamagwuna, U., Badaly, D. Pediatric Cardiac Rehabilitation: a Review. Curr Phys Med Rehabil Rep 7, 67–80 (2019). https://doi.org/10.1007/s40141-019-00216-9
- Pediatric cardiac rehabilitation
- Congenital heart defects
- Heart transplantation
- Neurodevelopmental outcomes
- Socioemotional adjustment