Adolescents' perception of asthma symptoms and health care utilization

Concordance Between Asthma Symptom Reports and Objective Lung Function, and Associations With Sleep Outcomes in Urban Children

OBJECTIVES

To examine the extent to which asthma symptom concordance (ASC) or discordance (ASD) is associated with sleep outcomes in children with persistent asthma. Also, to investigate whether the association between ASC and sleep outcomes varies as a function of children's level of asthma control and severity.

METHODS

A retrospective data analysis of Project NAPS (Nocturnal Asthma and Performance in School), an observational study which examined asthma and sleep outcomes in children with persistent asthma. Measures of ASC and ASD were developed from daily self-reported asthma symptoms and lung function measurements performed over 4 weeks. The extent to which ASC and ASD were associated with sleep efficiency, duration, and awakenings was evaluated. Concordance and discordance of asthma symptoms with sleep outcomes were examined as a function of the child's asthma severity and control.

RESULTS

Those whose asthma symptom reports were in concordance with their lung function had longer sleep duration than children whose reports were discordant (difference = 15 min, Z = 2.61, p < 0.05), and more nighttime awakenings (difference = 0.6 awakenings, Z = 2.30, p < 0.05). Children with well-controlled asthma had longer sleep duration (difference = 18 min, p < 0.0001).

CONCLUSION

This study builds on the literature on asthma symptom recognition by adding an evaluation of how ASC relates to sleep outcomes. Findings suggest that concordance of asthma symptoms with lung function is associated with longer sleep duration and moderated by asthma control. ASC may be important to sleep duration, which has important implications for tailoring asthma management to optimize symptom concordance.

Sore and tired. A qualitative study exploring the symptom experience of youth with bronchiectasis

This qualitative study was conducted to explore the experiences of youth living with bronchiectasis in New Zealand (NZ). Semi-structured interviews were conducted with youth with bronchiectasis. Key themes were identified using an inductive approach through constant comparative analysis and guided by Thorne's interpretive description (ID). Fifteen young people of mixed ethnicity (nine females and six males) aged between 13 and 23 years participated. Three key themes 'sore and tired', 'life interrupted and 'looking after self' were identified. This paper will focus on 'sore and tired' and its three subthemes which describe the participants symptom experience. While there was variability in physical symptom patterns, cough, soreness and fatigue were prominent features impacting physical, emotional and social aspects of day-to-day life. All identified pervasive and profound fatigue as significant. The identification of prodromal symptoms provides opportunity for greater appreciation of the varied and personal symptom experience of young people with bronchiectasis. Early identification of these symptoms and inclusion within management plans for escalating treatment has the potential to improve outcomes, reducing delays in seeking additional medical management and preventing further exacerbation.

Appropriate inhaler use in children with asthma: barriers and opportunities through the lens of the socio-ecological model

Objective: Proper use of inhaled medications is essential for management of asthma, as inhaled therapies are recommended as first-line for both prevention and treatment of asthma symptoms. Optimizing adherence requires identifying and understanding multiple layers of systemic complexity to obtaining and using these therapies and offering specific solutions to address these barriers. Bronfenbrenner's socio-ecological model provides a framework for examining multilevel systems - both internal and external - that contribute to the management of childhood asthma. The four levels in this model consist of factors related to the individual, interpersonal relationships, organizational entities, and societal structures and rules. This narrative review identifies influences and factors related to asthma inhaler adherence by each level and offers evidence-based solutions to each obstacle.Data Sources: We conducted PubMed searches to identify relevant articles for barriers and solutions impacting asthma control at each level of the socio-ecological model.Study Selection: Common barriers to asthma control at each model level were identified. Pertinent studies for each barrier were identified and reviewed by the writing group for inclusion into the narrative review.Results: For each level of the socio-ecological model, three primary issues were identified based on the literature review. Approaches for addressing each issue in an evidence-based, systematic fashion are presented.Conclusion: Understanding the obstacles and potential interventions to achieve proper use of inhaled medications is a critical step necessary to develop and implement systematic solutions aimed at improving asthma control and morbidity for the more than 6 million affected children in the United States.

Telehome Monitoring of Symptoms and Lung Function in Children with Asthma

Background: The ability to perceive bronchial obstruction is variable in asthma. This is one of the main causes of inaccurate asthma control assessment, on which therapeutic strategies are based. Objective: Primary: To evaluate the ability of physicians to characterize the bronchial obstruction perception profile in asthmatic children using a clinical and spiro-metric telemonitoring device. Secondary: To evaluate its impact on asthma management (control, treatment, respiratory function variability) and the acceptability of this telemonitoring system. Methods: 26 asthmatic children aged 6−18 years equipped with a portable spirometer and a smartphone application were home-monitored remotely for 3 months. Clinical and spiro-metric data were automatically transmitted to a secure internet platform. By analyzing these data, three physicians blindly and independently classified the patients according to their perception profile. The impact of telemonitoring on the quantitative data was assessed at the beginning (T0) and end (T3 months) of telemonitoring, using matched statistical tests. Results: Patients could initially be classified according to their perception profile, with a concordance between the three observers of 64% (kappa coefficient: 0.55, 95%CI [0.39; 0.71]). After discussion among the observers, consensus was reached for all patients but one. There was a significant >40% decrease in FEV1 and PEF variability, with good acceptance of the device. Conclusions: Clinical and spiro-metric tele-home monitoring is applicable and can help define the perception profile of bronchial obstruction in asthmatic children. The device was generally well accepted.

Frontiers Review: Severe Asthma in Adolescents

Asthma remains the most prevalent chronic respiratory disease of childhood. Severe asthma accounts for a minority group of patients but with substantial morbidity burden. It may reflect disease which is resistant to treatment or that which is difficult to treat, or a combination of both. The adolescent patient cohort denote a unique group and are the focus of this review. This group of patients embody transitioning priorities and evolving health beliefs, all of which may influence the management and burden of disease. Factors of importance include the influence of physiological parameters such as sex and race, which have confer implications for medical management and non-physiological factors, such as adherence, risk-taking behavior, and vaping. The holistic approach to management of severe asthma within this group of patients must acknowledge the evolving patient independence and desire for autonomy and strive for a collaborative, patient tailored approach. This review will focus on the factors that may pose a challenge to the management of severe adolescent asthma whilst offering suggestions for changes in practice that might harness patient priorities and shared clinical decision-making.

Qualitative evaluation of asthma services for young people: a sequential simulation study

Background

Asthma is the most common chronic disease of childhood and an important preventable cause of mortality in children and young people (CYP). Few studies have brought together CYP and health professionals to understand the patient perspective of routine asthma care. We sought to explore how young people engage with routine asthma care in North West London through sequential simulation.

Method

We designed a sequential simulation focusing on routine asthma management in young people aged 12-18. A 20 min simulation was developed with four young people to depict typical interactions with school nurses and primary care services. This was performed to a mixed audience of young people, general practitioners (GPs), paediatricians, school nurses and commissioners. Young people were invited to attend by their GPs and through social media channels. Attendees participated in audio-recorded, facilitated discussions exploring the themes arising from the simulation. Recordings were transcribed and subjected to thematic analysis.

Results

37 people attended the sequential simulation. Themes arising from postsimulation discussions included recognition of chaotic family lifestyles as a key barrier to accessing care; the importance of strong communication between multidisciplinary team professionals and recognition of the role school nurses can play in delivering routine asthma care.

Conclusion

Sequential simulation allows healthcare providers to understand routine asthma care for CYP from the patient perspective. We propose improved integration of school nurses into routine asthma care and regular multidisciplinary team meetings to reduce fragmentation, promote interprofessional education and address the widespread professional complacency towards this lethal condition.

Treatment Adherence in Adolescents with Asthma

The burden of asthma is particularly notable in adolescents, and is associated with higher rates of prevalence and mortality compared with younger children. One factor contributing to inadequate asthma control in adolescents is poor treatment adherence, with many pediatric studies reporting mean adherence rates of 50% or lower. Identifying the reasons for poor disease control and adherence is essential in order to help improve patient quality of life. In this review, we explore the driving factors behind non-adherence in adolescents with asthma, consider their consequences and suggest possible solutions to ensure better disease control. We examine the impact of appropriate inhaler choice and good inhaler technique on adherence, as well as discuss the importance of selecting the right medication, including the possible role of as-needed inhaled corticosteroids/long-acting β₂-agonists vs short-acting β₂-agonists, for improving outcomes in patients with mild asthma and poor adherence. Effective patient/healthcare practitioner communication also has a significant role to engage and motivate adolescents to take their medication regularly.

Mixed-methods content and sentiment analysis of adolescents' voice diaries describing daily experiences with asthma and self-management decision-making

BACKGROUND

Accurate symptom assessment remains challenging in teen populations. Little is known of usual symptom/response patterns, and self-reported paper diaries have traditionally low compliance rates. Therefore, we used concurrent digital voice diaries to capture daily asthma experiences.

OBJECTIVE

(a) To qualitatively explore usual symptom patterns and self-management responses and (b) to quantitatively explore relationships between symptom severity and sentiment scores (a marker of emotional response to events).

METHODS

Fourteen minority and nonminority teenagers (age 13-17) with controlled (50%) and uncontrolled asthma used digital recorders to report about their asthma once daily over 14 days. Dairy entries were coded for symptom frequency, severity, type, and self-management responses, while sentiment analysis was used to evaluate the emotional valence of diary entries and to explore whether increased symptom levels correlated with greater negative sentiment.

RESULTS

Symptom frequency and severity recorded in voice diaries were much higher than teens indicated at baseline and were discordant with clinical assessments of asthma control. Of 175 entries, teens had symptoms 69.1% of days (121/175) and severe symptoms on one-third of these. Atypical symptoms (coughing, throat clearing) were reported twice as often as traditional symptoms (wheezing, chest tightness) and often not recognized as asthma, but rather attributed to being "sick" (25.6% of symptom days). Teens frequently minimized symptoms, used rescue and controller medication inconsistently, and resorted to alternative strategies to manage symptoms. Sentiment was not significantly correlated with assessed control (β = 0.14, P = 0.28), but for teens reporting severe symptoms, sentiment scores decreased by 0.31 relative to teens without symptoms (P = 0.006).

CONCLUSIONS AND CLINICAL RELEVANCE

Teens may minimize symptoms and have greater symptom frequency and severity than is recognized by themselves or providers. Screening for specific symptoms including coughing, throat clearing, and respiratory illness may be needed to identify those experiencing burden from asthma.

The association of psychological factors and healthcare use with the discrepancy between subjective and objective respiratory-health complaints in the general population

BACKGROUND

We examined the prevalence of self-perceived respiratory symptoms (SRS) in the absence of any objective findings of respiratory pathology, and the association of such prevalence with psychological factors and healthcare use in the general population.

METHODS

The study was conducted among a nationally representative sample of Finnish adults (BRIF8901). Respiratory functioning was measured by a spirometry test. Structured questionnaires were used to measure SRS, physician visits and psychological factors of alexithymia, sense of coherence, illness worry and common mental disorders. Individuals with a diagnosed respiratory disease or a severe psychiatric disorder, determined in a diagnostic interview, were excluded, giving a sample comprising 4544 participants.

RESULTS

Twenty-six per cent of the general population and 36% of those with no diagnosed severe psychiatric disorder or respiratory disease experienced SRS despite a normal spirometry result. Psychological factors were associated with SRS (0.0001 &lt; p &lt; 0.032), and on the number of physician visit explaining 42.7% of the difference in visits between individuals with and without SRS, respectively. Illness worry was associated most strongly with SRS [odds ratio (OR) 1.29, 95% confidence interval (CI) 1.19-1.41, p &lt; 0.0001] and higher numbers of physician visits (OR 1.35, CI 1.32-1.38, p &lt; 0.00001), even after several adjustments.

CONCLUSIONS

Respiratory symptoms without objective findings are common in the general population. The study results underline the role of psychological factors in the reporting of respiratory symptoms and the associated medical burden, thereby indicating the functional nature of the symptomatology.

An integrated operational definition and conceptual model of asthma self-management in teens

OBJECTIVES

A previous definition of adolescent asthma self-management was derived from interviews with clinicians/researchers and published literature; however, it did not incorporate perspectives of teens or parents. Therefore, we conducted in-depth interviews with teens and parents and synthesized present findings with the prior analysis to develop a more encompassing definition and model.

METHODS

Focal concepts were qualitatively extracted from 14-day self-management voice-diaries (n = 14) and 1-hour interviews (n = 42) with teens and parents (28 individuals) along with concepts found in the previous clinical/research oriented analysis. Conceptual structure and relationships were identified and key findings synthesized to develop a revised definition and model of adolescent asthma self-management.

RESULTS

There were two primary self-management constructs: processes of self-management and tasks of self-management. Self-management was defined as the iterative process of assessing, deciding, and responding to specific situations in order to achieve personally important outcomes. Clinically relevant asthma self-management tasks included monitoring asthma, managing active issues through pharmacologic and non-pharmacologic strategies, preventing future issues, and communicating with others as needed. Self-management processes were reciprocally influenced by intrapersonal factors (both cognitive and physical), interpersonal factors (family, social and physical environments), and personally relevant asthma and non-asthma outcomes.

CONCLUSION

This is the first definition of asthma self-management incorporating teen, parent, clinician, and researcher perspectives, which suggests that self-management processes and behaviors are influenced by individually variable personal and interpersonal factors, and are driven by personally important outcomes. Clinicians and researchers should investigate teens' symptom perceptions, medication beliefs, current approaches to symptom management, relevant outcomes, and personal priorities.

Changes in asthma self-management knowledge in inner city adolescents following developmentally sensitive self-management training

OBJECTIVE

To evaluate efficacy of a developmentally sensitive curriculum for improving asthma self-management knowledge, attitude, and self-efficacy in adolescents.

METHODS

Fourty-two inner-city adolescents (ages 16-20) participated in a 12hour asthma self-management training program. Self-management knowledge, attitude toward asthma, and asthma-related self-efficacy were measured using short-answer tests before and after training. T-Tests were used to evaluate impact and effect sizes were calculated.

RESULTS

Mean pretest knowledge was 21.37/46 points; mean posttest was 36.33/46 points. Change from pre- to posttest was highly significant (t=10.34; p<0.0001), with a large effect size (d=1.68). Females improved more than males (18.66±8.58 vs. 12.29±8.13, p=0.039). Greatest effects were seen in awareness of long-term consequences of uncontrolled asthma (d=2.04), ability to recognize symptoms of life-threatening asthma (d=1.61), correctly monitor symptoms (d=1.49), and tell if asthma was uncontrolled (d=1.39). Asthma self-efficacy also improved significantly (p=0.017), particularly confidence in ability to correctly manage asthma, however improvements in attitude did not achieve statistical significance.

CONCLUSION

Developmentally appropriate training is effective in increasing critical self-management knowledge and self-efficacy in inner city adolescents, particularly females.

PRACTICE IMPLICATIONS

Providers should screen carefully for symptoms and educate using developmentally appropriate training materials on ways to correctly monitor and manage symptom.

Illness Experience, Self-Determination, and Recreational Activities in Pediatric Asthma

Although asthma self-management depends on ongoing and accurate self-assessment by the patient, pediatric asthma patients have weak skills in the area of symptom perception. Before developing an asthma game targeted to improving asthma self-management and improved symptom awareness, we sought to identify gaps in existing games. To clarify the role of relatedness and autonomy in asthma health game design, we investigated symptom awareness, vocabulary, and self-determination through a series of semi-structured interviews with children suffering from asthma. Using self-determination theory as a framework, interviews were oriented to patients' illness experience and vocabulary related to symptomatology, as well as to recreational activities. Formative analysis of the interviews reveals attitudes, perceptions, and motivational factors arising in the context of childhood asthma, and it elucidates the images and vocabulary associated with both illness experience and recreational activities. Qualitative assessment of patient perspectives leads to specific recommendations for game design ideas that will support market entry of a spirometer-controlled game for children with asthma.

Perceptions and experiences underlying self-management and reporting of symptoms in teens with asthma

BACKGROUND

Teens often have inadequate asthma self-management and control. However, little is known of their perceptions of or rationales for self-management behaviors.

OBJECTIVES

To explore how teens self-manage asthma, including experiences, perceptions, responses to and reporting of symptoms.

METHODS

A case-based, qualitative-descriptive design was used. Data were collected from minority and non-minority teens with controlled and uncontrolled asthma and their respective parents (N = 28). There were four data-collection points, including: (1) a primary teen interview; (2) parent interview; (3) 2-week self-management voice-diary; and (4) follow-up teen interview, incorporating symptom-response card-sorting to map symptoms and associated self-management responses. Seventy data sources were included in the analysis.

RESULTS

Teens thought of their asthma symptoms as normal or unusual relative to their personal baseline symptom pattern; Those with uncontrolled asthma normalized higher levels of asthma symptoms than their counterparts with controlled asthma. Second, teens' decisions to treat symptoms of asthma with rescue medication were based on perceived benefits, burdens and accessibility of treatment balanced against perceived normalcy of symptoms. Teens with uncontrolled asthma had substantially higher treatment thresholds and delayed responses to symptoms compared to controlled peers. Third, teens never reported perceived normal symptoms of asthma to parents or providers, who were thus only aware of unusual or visible/audible symptoms.

CONCLUSIONS

Teen's perceptions of symptoms and understanding of what is normal is the basis for self-management decisions. Improving self-management will likely entail modifying perceptions of symptoms and benefits/burdens of treatment to achieve healthier self-management patterns.

Psychological Factors Influencing the Decision of Urban Adolescents With Undiagnosed Asthma to Obtain Medical Care

PURPOSE

Adolescents are low users of medical care. Psychological factors and perceived reasons to not seek routine medical care may increase risk of nonuse by adolescents with undiagnosed asthma. This study tests if psychological factors were associated with seeing a medical provider for asthma-like symptoms; identifies adolescents' perceived reasons for not obtaining care; explores if psychological factors are associated with these perceptions; and explores if asthma severity moderates the relationships with psychological factors.

METHODS

We analyzed cross-sectional data from a baseline assessment of 349 urban, primarily ethnic minority adolescents with moderate to severe asthma-like symptoms but no asthma diagnosis who were enrolled in a controlled trial.

RESULTS

The odds of seeing a provider for their asthma-like symptoms were significantly higher for those with asthma-related anxiety (odds ratio [OR]: 1.644; 95% confidence interval [CI]: 1.242-2.176) and depressive symptoms (OR: 1.031; 95% CI: 1.004-1.059). The most commonly endorsed reason for noncare included a characterization of symptoms as not serious, past medical visits not diagnosed as asthma, fear of diagnosis, busy lifestyles, and not wanting medication. Psychological factors were not related to the number of reasons or to most of the commonly endorsed reasons. Adolescents with more asthma-related anxiety were less likely to characterize their breathing problems as serious (OR = .0583; 95% CI: .424-.802) and were more likely to report busy lifestyles (OR = 1.593; 95% CI: 1.122-2.261).

CONCLUSIONS

Adolescent-perceived reasons for noncare were not pragmatic, but instead highlighted denial. Asthma-related anxiety was the most robust psychological factor associated with the decision to seek medical care.

Development and Validation of an Instrument to Evaluate Perceived Wellbeing Associated with the Ingestion of Water: The Water Ingestion-Related Wellbeing Instrument (WIRWI)

BACKGROUND

Ingestion of water has been associated with general wellbeing. When water intake is insufficient, symptoms such as thirst, fatigue and impaired memory result. Currently there are no instruments to assess water consumption associated with wellbeing. The objective of our study was to develop and validate such an instrument in urban, low socioeconomic, adult Mexican population.

METHODS

To construct the Water Ingestion-Related Wellbeing Instrument (WIRWI), a qualitative study in which wellbeing related to everyday practices and experiences in water consumption were investigated. To validate the WIRWI a formal, five-process procedure was used. Face and content validation were addressed, consistency was assessed by exploratory and confirmatory psychometric factor analyses, repeatability, reproducibility and concurrent validity were assessed by conducting correlation tests with other measures of wellbeing such as a quality of life instrument, the SF-36, and objective parameters such as urine osmolality, 24-hour urine total volume and others.

RESULTS

The final WIRWI is composed of 17 items assessing physical and mental dimensions. Items were selected based on their content and face validity. Exploratory and confirmatory factor analyses yielded Cronbach's alpha of 0.87 and 0.86, respectively. The final confirmatory factor analysis demonstrated that the model estimates were satisfactory for the constructs. Statistically significant correlations with the SF-36, total liquid consumption and simple water consumption were observed.

CONCLUSION

The resulting WIRWI is a reliable tool for assessing wellbeing associated with consumption of plain water in Mexican adults and could be useful for similar groups.

A randomised dose-ranging study of tiotropium Respimat® in children with symptomatic asthma despite inhaled corticosteroids

BACKGROUND

A considerable number of children with asthma remain symptomatic despite treatment with inhaled corticosteroids, resulting in significant morbidity, reduced quality of life, increased healthcare costs and lost school days. The aim of our study was to assess the efficacy, safety and tolerability of once-daily tiotropium Respimat® 5 μg, 2.5 μg and 1.25 μg add-on to medium-dose inhaled corticosteroids, with or without a leukotriene modifier, in children aged 6-11 years with symptomatic asthma.

METHODS

In this Phase II, double-blind, placebo-controlled, incomplete-crossover, dose-ranging study, patients were randomised to receive three of the four treatments evaluated: once-daily tiotropium Respimat® 5 μg, 2.5 μg or 1.25 μg or placebo Respimat®, in the evening during the 12-week (three × 4-week) treatment period.

RESULTS

In total, 76, 74, 75 and 76 patients aged 6-11 years received tiotropium Respimat® 5 μg, 2.5 μg, 1.25 μg and placebo Respimat®, respectively. For the primary end point (peak forced expiratory volume in 1 second measured within 3 hours post-dosing), the adjusted mean responses with tiotropium Respimat® 5 μg (272 mL), 2.5 μg (290 mL) and 1.25 μg (261 mL) were significantly greater than with placebo Respimat® (185 mL; p = 0.0002, p < 0.0001 and p = 0.0011, respectively). The safety and tolerability of all doses of tiotropium Respimat® were comparable with those of placebo Respimat®, with no serious adverse events and no events leading to discontinuation.

CONCLUSIONS

Tiotropium Respimat® add-on to medium-dose inhaled corticosteroids, with or without a leukotriene modifier, was efficacious in paediatric patients with symptomatic asthma and had comparable safety and tolerability with placebo Respimat®.

TRIAL REGISTRATION

ClinicalTrials.gov identifier NCT01383499.

Psychosocial factors and behavioral medicine interventions in asthma

OBJECTIVE

This review examines the evidence for psychosocial influences in asthma and behavioral medicine approaches to its treatment.

METHOD

We conducted a systematic review of the literature on psychosocial influences and the evidence for behavioral interventions in asthma with a focus on research in the past 10 years and clinical trials. Additional attention was directed at promising new developments in the field.

RESULTS

Psychosocial factors can influence the pathogenesis and pathophysiology of asthma, either directly through autonomic, endocrine, immunological, and central nervous system mechanisms or indirectly through lifestyle factors, health behaviors, illness cognitions, and disease management, including medication adherence and trigger avoidance. The recent decade has witnessed surging interest in behavioral interventions that target the various pathways of influence. Among these, self-management training, breathing training, and exercise or physical activation programs have proved particularly useful, whereas other essential or promising interventions, such as smoking cessation, dietary programs, perception and biofeedback training, and suggestive or expressive psychotherapy, require further, more rigorous evaluation. Given the high comorbidity with anxiety and mood disorders, further evaluation of illness-specific cognitive behavior therapy is of particular importance. Progress has also been made in devising community-based and culturally tailored intervention programs.

CONCLUSION

In concert with an essential medication treatment, behavioral medicine treatment of asthma is moving closer toward an integrated biopsychosocial approach to disease management.

Adolescent Asthma Self-Management: A Concept Analysis and Operational Definition

BACKGROUND: Adolescents with asthma have a higher risk of morbidity and mortality than other age groups. Asthma self-management has been shown to improve outcomes; however, the concept of asthma self-management is not explicitly defined. METHODS: We use the Norris method of concept clarification to delineate what constitutes the concept of asthma self-management in adolescents. Five databases were searched to identify components of the concept of adolescent asthma self-management, and lists of relevant subconcepts were compiled and categorized. RESULTS: Analysis revealed 4 specific domains of self-management behaviors: (1) symptom prevention; (2) symptom monitoring; (3) acute symptom management; and (4) communication with important others. These domains of self-management were mediated by intrapersonal/cognitive and interpersonal/contextual factors. CONCLUSIONS: Based on the analysis, we offer a research-based operational definition for adolescent asthma self-management and a preliminary model that can serve as a conceptual base for further research.

Symptoms, lung function, and perception of asthma control: an exploration into the heterogeneity of the asthma control construct

BACKGROUND

Asthma control is still surprisingly poor, which may be related to factors causing discrepancies between objective lung function measures and subjective symptom reports or discrepancies between objective indicators of asthma control and control perception. Identifying patients prone to such discrepancies may help to understand asthma control problems.

METHODS

Ninety-four persons with asthma participated in this study. We used cluster analysis to identify different subgroups of asthma control, based on a measure of lung function and self-report of daytime and nighttime symptoms, activity limitations, reliever medication use, and perception of asthma control. Subsequently, we explored between-cluster differences in clinical and psychological characteristics.

RESULTS

We identified two homogeneous clusters: a cluster of persons with poorly controlled asthma and a cluster of persons with well-controlled asthma. A third cluster included persons with an intermediate level of asthma control, an absence of nighttime symptoms, and a reduced impact of asthma symptoms on daily activities despite high levels of symptoms and reliever medication use. Members of the poorly controlled asthma cluster showed higher symptom levels, more catastrophic thinking, and activity avoidance beliefs compared with members of other clusters.

CONCLUSION

The clusters we identified crosscut current definitions of asthma severity and asthma control and indicate the importance of affective evaluation of symptoms in explaining poor asthma control.