Psychological and lifestyle risk factors for asthma exacerbations and morbidity in children
© The Author(s). 2017
Received: 5 May 2017
Accepted: 13 September 2017
Published: 17 October 2017
Asthma is the most common childhood illness and disproportionately affects low-income, minority children who live in urban areas. A range of risk factors are associated with asthma morbidity and mortality, such as treatment non-adherence, exposure to environmental triggers, low-income households, exposure to chronic stress, child psychological problems, parental stress, family functioning, obesity, physical inactivity, and unhealthy diets. These risk factors often have complex interactions and inter-relationships. Comprehensive studies that explore the inter-relationships of these factors in accounting for asthma morbidity and mortality are needed and would help to inform clinical intervention. Considerable research has focused on interventions to improve adherence, asthma management, asthma symptoms, and quality of life for patients with asthma. Educational interventions combined with psychosocial interventions, such as behavioral, cognitive-behavioral, or family interventions, are beneficial and provide care in schools, homes, and emergency rooms can help to address barriers to accessing care for children and families. Additional recent research has explored the use of multidisciplinary, collaborative, integrated care with pediatric asthma patients, providing promising results. Integrated care could be ideal for addressing the multitude of complex psychosocial and wellness factors that play a role in childhood asthma, for increasing patient-centered care, and for promoting collaborative patient-provider relationships. Further research in this area is essential and would be beneficial.
Asthma is the most common chronic illness among children in the United States, affecting an estimated 10.6 million (14.5%) children , with significant impact on the physical and psychosocial well-being of affected youth. A child’s asthma can place significant stress and strain on parents and family systems. Considerable research has focused on childhood asthma, exploring disease risk factors, adherence, the role of child and caregiver psychological problems, the impact of family and environmental stressors, and the relationship between asthma and wellness factors such as obesity. Other research has also explored interventions to reduce adherence problems and improve overall functioning and asthma management in youth with asthma.
Environmental risk factors
Low-income, urban minority youth are disproportionately affected by asthma, such that higher asthma prevalence rates and disease morbidity have been found in children from low socioeconomic (SES) [2, 3] and urban minority families [3, 4]. Prevalence rates indicate that African American children have higher rates of asthma than Latino or White children , and Puerto Rican children have higher rates of asthma than other Latino children . Additionally, African American and Latino children with asthma have more emergency room visits and higher mortality rates from asthma than White children with asthma . Some research indicates that these racial differences in asthma prevalence rates are primarily present in low-income youth and not in minority children from middle- or upper- incomes .
Children living in low-income households often experience increased stress, such as family conflict, violence, lower quality home environments, dangerous neighborhoods, and polluted air and water , which is believed to be a risk factor for asthma . Accordingly, housing-related stress , community stressors, such as high crime rates , poverty , chronic family stress , and exposure to tobacco smoke and pollutants  are associated with increased asthma symptoms. As one pathway to explain this relationship, exposure to chronic stress is associated with a heightened inflammatory profile that, in turn, is associated with increased asthma symptoms .
Additionally, research has found that children living in low-income households are more likely to experience reduced parental support and involvement, to spend more time watching television, and to feel more of a lack of control over their lives and living environments . Children from economically disadvantaged households may also experience less access to care and poorer quality of care ; it is estimated that 41% of children aged 2–17 do not receive needed mental health services . As such, low-income, urban minority children have increased barriers to proper asthma management, including increased exposure to environmental triggers and reduced access to appropriate treatment .
Further, lower parental education has been associated with higher prevalence rates of asthma, lower adherence with asthma medications, and higher rates of hospitalizations for asthma . As parents in low-income households tend to have less education than parents in high-income households, this could also explain the relationship between low-income households and asthma.
Adherence with asthma medication
It is well established that asthma medications, when taken properly, reduce asthma morbidity, emergency room visits, and hospitalizations, and poor adherence to asthma controller medications is associated with increased severe asthma exacerbations , uncontrolled asthma [17, 18], asthma morbidity [19, 20], and asthma mortality . However, asthma controller medications tend to be underused in children  and medication non-adherence is a significant concern , especially among urban minority patients . Given these results, interventions to improve medication adherence are important for reducing asthma morbidity and mortality. Additionally, improved asthma medication adherence and consequent improved asthma control can lead to increased quality of life .
Several risk factors appear to undermine medication adherence in children, including male gender, non-Asian ethnic background, living in a larger household, older age at diagnosis , living in rural areas , and lower socio-economic status . Factors that contribute to non-adherence can generally be classified as intentional or non-intentional . Unintentional factors include obstacles and barriers that result in medications not being taken by reasons other than one’s choice. Lack of parental involvement , lack of access to appropriate medications, improper inhaler technique , child psychological distress , adolescent forgetting , caregiver psychological distress, issues in family functioning , poor child and family understanding of asthma and asthma medications, limited symptom recognition, and a lack of community support . Additionally, poor child and family understanding of asthma and asthma medications, limited symptom recognition, and a lack of community support can also contribute to medication non-adherence . Intentional factors include beliefs about one’s illness and medication that result in a choice to not take medications as prescribed . Intentional factors, such as parental concerns regarding controller medications (e.g., side effects, safety) and treatment cost , and adolescent beliefs that medication is not needed or beneficial  have been shown to be associated with higher rates of non-adherence.
Psychological functioning in children with asthma and their caregivers
A majority of research suggests that children with asthma display more behavior problems  and internalizing disorders, such as anxiety and affective disorders, than their healthy peers . The association between asthma and behavioral and emotional difficulties has been shown to significantly increase with asthma severity . These psychological difficulties in children with asthma have been associated with increased functional limitations and poorer asthma management. For example, even after controlling for asthma severity, children with co-occurring asthma and internalizing disorder had increased functional impairments , more missed school days , increased use of rescue medications, poorer pulmonary functioning, more frequent emergent care use , and higher treatment non-adherence which, in turn, is associated with poorer health outcomes .
A child’s asthma can also affect caregiver adjustment, psychological functioning, and experience of stress. A significant increased risk for psychological difficulties in caregivers of children with asthma is reflected in increased rates of depression [29, 38] and anxiety . These psychological difficulties in caregivers of children with asthma may contribute to problems in asthma management. For example, parental stress is significantly related to poorer medication adherence, and maternal depressive symptoms are associated with more problems in using proper inhaler technique, poorer medication adherence, greater exposure to tobacco smoke, and lower confidence in their abilities to manage their child’s asthma .
Wellness and lifestyle
Recent research has focused on wellness factors, such as health promoting or health threatening lifestyle behaviors (e.g., diet, exercise), and their relevance to patients with asthma. Investigators have found a positive relationship between obesity and asthma in pediatric populations [40, 41]. Obesity in children and adolescents, in general, has also been associated with increased depression and anxiety [42, 43]. In children with asthma, obesity has been found to be associated with increased uncontrolled asthma [13, 44], asthma severity [41, 45], emergency care use, and corticosteroid use . Additionally, obesity presents challenges to asthma management, such as decreased responsiveness to asthma controller medications and decreased quality of life , and overweight children with asthma have been found to have increased negative effects from pollutant exposure when compared to healthy-weight children with asthma .
Low levels of physical activity can be seen in children with asthma and contribute to obesity and psychological health problems. For example, children with asthma have been shown to have lower levels of physical activity [48, 49] and higher levels of engagement in sedentary activities, such as time spent on a computer . Additionally, overweight children with asthma have been shown to be significantly less likely to engage in physical exercise than overweight children without asthma . Increased inactivity can contribute to the problematic relationship between asthma and obesity. For example, in overweight children with asthma, increased time spent watching television was associated with increased risk of respiratory symptoms [52, 53] whereas increased physical activity was associated with reduced risk of respiratory symptoms . Additionally, it is suggested that reduced physical activity results in increased asthma morbidity . Further, data suggests that, for children with asthma, there is a positive relationship between level of physical activity and mental health .
Similarly, diet is related to weight and affects asthma. Children who mostly eat a “Western” diet, characterized by high amounts of fat and processed foods, have been shown to have higher asthma prevalence rates than children who eat diets with less fat and processed foods . The Mediterranean diet has been associated with reduced asthma symptoms  and it is suggested that adherence to a healthy diet may have beneficial, protective effects on children’s asthma . One possible explanation for the relationship between diet and asthma is the effect of diet on intenstinal microbiota and, in turn, the effect of intenstinal microbiota on immune inflammatory responses .
There are a range of psychosocial interventions for children with asthma, such as educational programs, behavioral interventions, cognitive-behavioral therapy, family interventions, and/or community-based interventions. Research on the efficacy of psychosocial interventions is limited, inconclusive [59, 60], and plagued by concerns regarding methodological issues . Despite these issues, preliminary evidence suggests that psychosocial interventions can improve the quality of life and medical outcomes for children with asthma. Interventions that combine education with psychosocial interventions, such as behavioral, cognitive-behavioral, and/or family interventions show particular promise .
Some interventions, such as self-management training and education, are considered well-established and essential parts of treatment for asthma patients throughout their course of care. Research on these programs has found benefits for children with asthma, including improved knowledge and confidence regarding disease management [61, 62], improved adherence [23, 63], improved asthma symptoms , improved lung function , reduced emergency room visits [65, 66], fewer school absences, less activity restriction , and improved quality of life . However, there are considerable global disparities in regards to access to culturally-sensitive, age-appropriate patient education materials .
Given concerns regarding lack of access to effective interventions, particularly for children from disadvantaged backgrounds, some investigators have increasingly focused on exploring school-based, emergency-room based, and home-based educational interventions. When these interventions included parents, results indicated that parent self-efficacy for disease management improved . Emergency room interventions are associated with increased adherence and reduced future emergency visits . Further, research has found that home-based interventions reduce asthma symptoms and emergency visits [70, 71].
Despite these results, comprehensive meta-analyses of results across studies have concluded that education interventions, without additional interventions, are not sufficient for improving asthma management and health outcomes . Investigations have shown that incorporating psychosocial interventions, such as behavioral or cognitive-behavioral interventions, into asthma education programs resulted in reduced asthma severity, reductions in emergency room visits , reduced child depression, reduced children stress , reduced school absences , improved adherence, and reduced parent–child conflict . Similarly, education combined with family therapy resulted in benefits for children and for parents, resulting in reduced airway inflammation, improved physical health, and improved mental health. Parents also showed increased parental efficacy in regards to asthma management and reduced parental anxiety . Additionally, one study found that increasing parental supervision increased child medication adherence .
For providers working with overweight pediatric patients, interventions to increase levels of physical activity and reduce unhealthy eating behaviors is emphasized . A behavioral intervention focused on improving dietary intake, for example, resulted in reduced BMI and improved asthma  and an intervention that included psychological, nutritional, and exercise components showed reduced BMI, improved asthma control, and improved lung functioning .
Given the complex array of factors influencing onset and severity of asthma, addressing this challenge requires bringing together multiple intervention components tailored to address the needs of individual children and their families. Recent evidence points to the importance of comprehensive, collaborative, multi-disciplinary care – known as integrated care - that addresses mental health, patient education, and family functioning in addition to traditional medical care . Guidelines from the National Institute for Health , for example, specifically highlight the benefits of an interdisciplinary approach for patients with complicating psychological comorbidities, psychosocial stressors, and treatment non-adherence. Worldwide, institutions are working to develop integrated care through comprehensive care pathways for the treatment of asthma . As such, a comprehensive approach to teaching asthma self-management skills that includes involvement of the community in program design and significantly focuses on family stress, family relationships [83, 84], family conflict, parental stress, parenting styles, and child behavior  may produce greater benefit and outcomes for children with asthma.
Integrated care programs that provide integrated care have demonstrated significant improvements in asthma symptoms, perceived competence in asthma management, reduced corticosteroid use, and improved quality of life for caregivers and children [85, 86]. In particular, engagement interventions that focus on specifically addressing barriers to treatment, such as telephone contacts, inclusion of brief interventions, and parent problem-solving, can significantly increase attendance at initial appointments and continued participation in treatment . These strategies have shown promising effectiveness for adolescent substance abuse [88, 89], child mental health , and attention deficit/hyperactivity disorder .
Integrated care can occur in multiple settings according to level of patient need. Pediatric psychologists are often employed in inpatient settings or in tertiary care clinics as a part of the consultation-liaison services , but are increasingly incorporated into integrated care teams [80, 85]. Behavioral health practitioners can help medical providers implement adherence promotion interventions during medical appointments . Finally, a movement toward early intervention and preventative care [94, 95] offers opportunities for multidisciplinary interventions within primary care settings  and school-based health centers [97, 98]. As children spend a significant proportion of their day at school (often 6–8 h), schools offer a unique opportunity for medication administration, parental support, and behavioral intervention. Studies of school-based interventions have found benefits that include improved knowledge, self-efficacy, and disease management  and improved asthma control .
Accordingly, comprehensive approaches to treatment that consider the interplay between personal, familial, and environmental risk factors are needed. Recent research has underscored the importance of multidisciplinary, collaborative, integrated care for pediatric asthma patients with promising results. Such a comprehensive approach is ideal for addressing the multitude of complex, inter-related psychosocial and wellness/lifestyle factors that play a role in childhood asthma. This integrated care approach could also be productive for increasing patient-centered care, shared decision making, and collaborative relationships between families and providers. Further research in this area is needed and would be beneficial.
The distribution of this paper is funded by independent educational grants from Teva Pharmaceuticals, founding supporter, and Sanofi Genzyme Regeneron Pharmaceuticals.
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