Symptom perception and functional morbidity across a 1-year follow-up in pediatric asthma

Cost effectiveness of a novel swallowing and respiratory sensation assessment and a modelled intervention to reduce acute exacerbations of COPD

Swallowing impairment observed in ~ 20% of people with Chronic Obstructive Pulmonary Disease (COPD) may increase the risk of aspiration pneumonia and acute exacerbations. We designed a decision analytic model to assess the cost-effectiveness of the Swallowing and Respiratory Sensation Assessment (SwaRSA) tests and swallowing rehabilitation to reduce COPD exacerbations. We believe that swallowing rehabilitation to improve coordination of swallowing and breathing may reduce exacerbations in people with COPD.From the Australia health system perspective, we assessed the cost effectiveness of four tests relative to standard of care, or no testing, over a time horizon of one year. The SwaRSA tests assessed relative to a standard of care arm of no testing: included the Eating Assessment Tool (EAT-10) score, Swallowing Capacity of Liquids, Tongue Strength Assessment, and Respiratory Sensation Assessment, in people with moderate to severe COPD. Outcome measures were COPD exacerbations per year, which were converted into quality adjusted life years (QALYs). Model inputs including costs, test sensitivities and specificities, COPD exacerbation risks, and exacerbation-related utilities were derived from published sources. Our assumptions on the costs, recovery, and risk reduction are based on the available data on pulmonary rehabilitation in COPD.Relative to no-SwaRSA, three individual testing strategies were found to be cost-effective at incremental cost effectiveness ratio per QALY ranging from $27,000 to $37,000 AUD assuming a willingness to pay of $50,000 AUD. The EAT-10 and the tongue strength were the two dominant options on the cost-effectiveness frontier. Model results were robust to variations in one-way and probabilistic sensitivity analyses.In COPD, SwaRSA modelling suggests that self-assessment with the EAT-10 and subsequent intervention is highly cost-effective relative to no-SwaRSA.

Peak Flow Feedback Intervention Improves Underperception of Airflow Limitation in Pediatric Asthma: A Randomized Clinical Trial

Rationale: Underperception of asthma symptoms is associated with poor asthma outcomes. Objectives: We assessed the effects of a behavioral intervention for improving perception of airflow limitation and asthma outcomes. Methods: A two-arm randomized controlled trial compared peak expiratory flow (PEF) feedback versus supportive counseling. Latino and Black adolescents with asthma ages 10-17 years old and caregivers were recruited from hospitals in the Bronx, New York. PEF feedback sessions reviewed accuracy of PEF guesses and medication adherence data and targeted behavior change using motivational interviewing and problem-solving skills training. The supportive counseling group received emotional support related to asthma. Both groups received three sessions across 6 weeks. All participants were blinded to PEF while guessing PEF before intervention and at 1, 6, and 12-month follow-up. Children in the PEF feedback group saw actual PEF after guesses were locked in during the 6-week intervention. Participants and assessors were blinded to group assignment. The primary outcome was underperception of airflow limitation (divergence between actual PEF and guesses) on home spirometers. Secondary outcomes included daily PEF and forced expiratory volume in 1 second (FEV1), inhaled corticosteroid adherence measured by electronic monitors, Asthma Control Test, and emergency health care use for asthma. Results: The sample comprised 354 children (mean = 13.2 ± 2.2 yr; 62% Latino, 38% Black) and caregivers. The PEF feedback group (N = 153 analyzed) demonstrated greater improvements at 1-month follow-up on underperception of airflow limitation (difference-in-differences, -12.64; 95% confidence interval [CI], -17.54 to -7.74), percent personal best PEF (9.89; 95% CI, 7.13 to 12.65), percent predicted FEV1 (4.93; 95% CI, 0.95 to 8.90), and inhaled corticosteroid adherence (16.02; 95% CI, 7.15 to 24.89) compared with the supportive counseling group (N = 152 analyzed). At 12-month follow-up, the PEF feedback group maintained improvements on underperception of airflow limitation (-13.87; 95% CI, -19.03 to -8.71), maintained higher percentage personal best PEF (14.23; 95% CI, 11.37 to 17.08) and percent predicted FEV1 (5.62; 95% CI, 1.56 to 9.67), and had smaller declines in inhaled corticosteroid adherence (17.51; 95% CI, 7.12 to 27.89) versus before intervention than the supportive counseling group. No between-group differences existed for asthma control or health care use. Conclusions: The efficacy and sustainability of PEF feedback was established in improving children's perception of airflow limitation, pulmonary function, and medication adherence. Clinical trial registered with www.clinicaltrials.gov (NCT02702687).

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.

World Trade Center workers with asthma and post-traumatic stress disorder perceive airflow limitation more accurately

BACKGROUND

Post-traumatic stress disorder (PTSD) is a major risk factor for increased asthma morbidity among World Trade Center (WTC) workers.

OBJECTIVE

To investigate whether differences in perception of airflow limitation mediate the association of PTSD with worse asthma control in WTC workers.

METHODS

We collected data from WTC workers on asthma control (Asthma Control Questionnaire and Asthma Quality of Life Questionnaire) and daily peak expiratory flow (PEF) measures over 6 weeks. Perception of airway limitation was assessed by comparing guessed vs actual PEF values. Post-traumatic stress disorder was diagnosed using the Structured Clinical Interview. We used unadjusted and adjusted models to compare PEF and perception measures in WTC workers with PTSD with those of workers without PTSD.

RESULTS

Overall, 25% of 224 participants had PTSD. Post-traumatic stress disorder was associated with worse Asthma Control Questionnaire (2.2±0.8 vs 1.1±0.9, P < .001) and Asthma Quality of Life Questionnaire (3.9±1.1 vs 5.4±1.1, P < .001) scores. Adjusted analyses showed no significant differences in PEF between WTC workers with (351.9±143.3 L/min) and those without PTSD (364.6±131.6 L/min, P = .55). World Trade Center workers with PTSD vs those without PTSD had increased proportion of accurate perception (67.0±37.2% vs 53.5±38.1%, P = .01) and decreased underperception (23.3.0±32.1% vs 38.9±37.5%, P = .004) of airflow limitation during periods of limitation. Similar results were obtained in adjusted analyses.

CONCLUSION

This study indicates that differences in perception of airflow limitation may mediate the relationship of PTSD and increased asthma symptoms, given WTC workers with PTSD have worse self-reported asthma control, an increased proportion of accurate perception, and decreased underperception, despite no differences in daily PEF measures.

Brain structural and functional alterations related to anxiety in allergic asthma

Psychiatric disorders are common in patients with allergic asthma, and they can have a significant impact on their quality of life and disease control. Recent studies have suggested that there may be potential immune-brain communication mechanisms in asthma, which can activate inflammatory responses in different brain areas, leading to structural and functional alterations and behavioral changes. However, the precise mechanisms underlying these alterations remain unclear. In this paper, we comprehensively review the relevant research on asthma-induced brain structural and functional alterations that lead to the initiation and promotion of anxiety. We summarize the possible pathways for peripheral inflammation to affect the brain's structure and function. Our review highlights the importance of addressing neuropsychiatric disorders in the clinical guidelines of asthma, to improve the quality of life of these patients. We suggest that a better understanding of the mechanisms underlying psychiatric comorbidities in asthma could lead to the development of more effective treatments for these patients.

Under-perception of airflow limitation, self-efficacy, and beliefs in older adults with asthma

OBJECTIVE

Under-perception of airflow limitation is more common in older adults with asthma and may lead to under-reporting of asthma symptoms. Asthma management self-efficacy is linked with better asthma control and quality of life (QoL). We sought to examine asthma and medication beliefs as a mediator in the relationship between both under-perception and self-efficacy with asthma outcomes.

METHODS

This cross-sectional study recruited participants with asthma ≥60 years from hospital-affiliated practices in East Harlem and the Bronx, New York. Perception of airflow limitation was measured for 6 weeks by having participants enter peak expiratory flow (PEF) estimates into an electronic peak flow meter followed by PEF blows. We used validated instruments to assess asthma and medication beliefs, asthma management self-efficacy, asthma control, and QoL. Asthma self-management behaviors (SMB) were quantified by electronic and self-report measures of inhaled corticosteroid (ICS) adherence and observation of inhaler technique.

RESULTS

The sample comprised 331 participants (51% Hispanic, 27% Black, 84% female). Beliefs mediated the relationship between greater under-perception and better self-reported asthma control (β = -0.08, p = .02) and better asthma QoL (β =0.12, p = .02). Higher self-efficacy was also associated with better reported asthma control (β = -0.10, p = .006) and better asthma QoL (β =0.13, p = .01) in this indirect effect through beliefs. Accurate perception of airflow limitation was associated with higher adherence to SMB (β = 0.29, p = .003).

CONCLUSIONS

Less threatening asthma beliefs may be maladaptive in under-perception of airflow limitation by contributing to under-reporting of asthma symptoms, but adaptive in the context of higher self-efficacy and better asthma control.

Respiratory-related evoked potentials in chronic obstructive pulmonary disease and healthy aging

Altered neural processing and increased respiratory sensations have been reported in chronic obstructive pulmonary disease (COPD) as larger respiratory-related evoked potentials (RREPs), but the effect of healthy-aging has not been considered adequately. We tested RREPs evoked by brief airway occlusions in 10 participants with moderate-to-severe COPD, 11 age-matched controls (AMC) and 14 young controls (YC), with similar airway occlusion pressure stimuli across groups. Mean age was 76 years for COPD and AMC groups, and 30 years for the YC group. Occlusion intensity and unpleasantness was rated using the modified Borg scale, and anxiety rated using the Hospital Anxiety and Depression Scale. There was no difference in RREP peak amplitudes across groups, except for the N1 peak, which was significantly greater in the YC group than the COPD and AMC groups (p = 0.011). The latencies of P1, P2 and P3 occurred later in COPD versus YC (p < 0.05). P3 latency occurred later in AMC than YC (p = 0.024). COPD and AMC groups had similar Borg ratings for occlusion intensity (3.0 (0.5, 3.5) [Median (IQR)] and 3.0 (3.0, 3.0), respectively; p = 0.476) and occlusion unpleasantness (1.3 (0.1, 3.4) and 1.0 (0.75, 2.0), respectively; p = 0.702). The COPD group had a higher anxiety score than AMC group (p = 0.013). A higher N1 amplitude suggests the YC group had higher cognitive processing of respiratory inputs than the COPD and AMC groups. Both COPD and AMC groups showed delayed neural responses to the airway occlusion, which may indicate impaired processing of respiratory sensory inputs in COPD and healthy aging.

AIM2ACT: Randomized controlled trial protocol for a mobile health intervention for early adolescents with asthma

Early adolescents diagnosed with asthma have difficulties consistently performing disease self-management behaviors, placing them at-risk for poor asthma control, morbidity, and reduced quality of life. Helpful caregiver support is pivotal in determining whether early adolescents develop and master asthma self-management behaviors. We developed Applying Interactive Mobile health to Asthma Care in Teens (AIM2ACT), a mobile health intervention to facilitate helpful caregiver support in early adolescents (12-15 year-olds) with poorly controlled asthma. AIM2ACT is a dyadic smartphone intervention that contains three components: 1) ecological momentary assessment to identify personalized strengths and weaknesses in asthma self-management behaviors; 2) collaborative identification and tracking of goals that help early adolescents to become increasingly independent in managing their asthma; and 3) a suite of skills training videos. This paper describes our plans to test the efficacy of AIM2ACT and evaluate long-term maintenance of treatment effects in a fully powered randomized controlled trial with 160 early adolescents with poorly controlled persistent asthma, ages 12-15 years, and a caregiver. Families will be randomly assigned to receive AIM2ACT (n = 80) or a mHealth attention control condition (n = 80) that accounts for attention and novelty of a technology-based intervention for 6 months. Assessments will occur at baseline, post-intervention, and 3-, 6-, and 12-month follow-up time points. We will collect patient-reported and objectively monitored (e.g., spirometry, adherence) outcomes. Given the timing of the trial, a secondary exploratory goal is to evaluate the perceived impact of COVID-19 on family functioning and parental control of their adolescent's asthma in the context of our intervention.

Effectiveness of a community-driven, asthma intervention: Project Asthma In-Home Response

Project Asthma In-home Response (AIR) is a multilevel, home-based intervention to address childhood asthma. This study aims to assess the effectiveness of the community-driven, multilevel Project AIR intervention. We hypothesize that children participating in the Project AIR intervention will have reduced asthma-related emergency room visits, hospitalizations, and asthma exacerbations. Seventy-Five participants of an in-home asthma intervention were surveyed at the onset of intervention and six months after the intervention. The mean age of clients in the sample population was ten years. Most clients in the sample population were 11 to 15 years old (34.7%), followed by 6 to 10 years old (29.3%) and 3 to 5 years (26.0%). Participation in the Project AIR intervention resulted in significant reductions in asthma attacks (p-value 0.0003), asthma-related emergency room visits (p-value >0.0001), and asthma-related hospitalizations (p-value 0.008). The results of this study support that in-home environmental asthma programs are an efficient method of treating asthma in a smaller metro area. Our findings reinforce prior studies in larger metropolitan areas such as New York and Boston (1).

Cognition, symptom perception, and medication non-adherence in older adults with asthma

BACKGROUND

Cognitive impairment (CI) is highly prevalent in elderly asthmatics and is associated with worse asthma self-management (SM) and outcomes. CI may also explain why older adults may under-perceive asthma symptoms. We hypothesized that CI would be associated with low medication adherence and asthma symptom under-perception (ASP). We also hypothesized that ASP would mediate the relationship between CI and medication adherence.

METHODS

Participants of this longitudinal cohort study were asthmatics (N = 334) ≥60 years (51% Hispanic, 25% Black). Cognitive measures assessed general cognition, attention, processing speed, executive functioning, memory, and language. Measures of SM were self-reported and electronically measured adherence to controller medications. ASP was assessed for 6 weeks by participants entering estimates of peak expiratory flow (PEF) into a programmable peak flow meter, followed by PEF blows. Participants were blinded to actual PEF values. Percentage of time that participants were in the over-perception zone was calculated as an average.

RESULTS

In regression analyses, those with impairments in memory and general cognition had lower odds ratios (OR) for self-reported non-adherence (OR: 0.96, 95% CI 0.93 - 0.98 & OR: 0.90, 95% CI 0.83 - 0.96, respectively). CI was not associated with electronically measured non-adherence or ASP. In structural equation modeling, while CI was associated with adherence (β = 0.04, SE = 0.021, p = 0.04), ASP did not mediate this relationship.

CONCLUSIONS

While results confirmed the importance of cognition in asthma SM, these findings were not linked to ASP. Future analyses are needed to understand the role of confounding factors.

Using Mobile Health to Improve Asthma Self-Management in Early Adolescence: A Pilot Randomized Controlled Trial

PURPOSE

Early adolescence is an important developmental period where youth take primary responsibility for asthma self-management. Helpful caregiver support during this time is pivotal in determining whether early adolescents successfully develop asthma self-management behaviors. AIM2ACT is a dyadic mobile health intervention designed to increase helpful caregiver support as early adolescents engage in asthma self-management behaviors. We conducted a pilot randomized controlled trial to determine the feasibility and acceptability of AIM2ACT and conduct preliminary tests of efficacy.

METHODS

We randomized adolescents (12-15 years old) and a caregiver to receive AIM2ACT (n = 17) or a self-guided attention control condition (n = 16) for 20 weeks. We conducted assessment visits at baseline, postintervention, and 4-month follow-up. Outcomes included family asthma management (primary outcome), adolescent asthma control, lung function (forced expiratory volume in 1 second), asthma-related quality of life, asthma management self-efficacy, and family communication.

RESULTS

We randomized 33 dyads and had 100% retention in the trial among AIM2ACT participants. Dyads frequently engaged with AIM2ACT (M = 21 days for adolescents, 32.65 days for caregivers) and reported very high satisfaction with content, functionality, and helpfulness. Participants randomized to AIM2ACT had significant improvements in asthma control scores (p = .04) compared to control that surpassed the minimally clinically important difference threshold. Although not statistically significant, the magnitude of improvements in family asthma management, asthma-related quality of life, and family communication was larger in the AIM2ACT group.

CONCLUSIONS

AIM2ACT is a feasible and acceptable dyadic mobile health asthma self-management intervention that improves asthma control.

Depressive Symptoms and Overperception of Airflow Obstruction in Older Adults With Asthma

OBJECTIVE

Older adults are at increased risk for depression and poor asthma outcomes. We examined whether depressive symptoms are associated with overperception of airflow obstruction and a pattern of worse asthma control, but not pulmonary function.

METHODS

We recruited a cohort of adults with asthma 60 years and older in East Harlem and the Bronx, New York. Baseline measures included the Geriatric Depression Scale, Asthma Control Questionnaire, and Mini Asthma Quality of Life Questionnaire. Spirometry was conducted at baseline to assess pulmonary function. Perception of airflow obstruction was assessed for 6 weeks following baseline by participants entering estimates of peak expiratory flow (PEF) into a programmable peak flow meter followed by PEF blows. Participants were blinded to actual PEF values. The percentage of time that participants were in the overperception zone was calculated as an average.

RESULTS

Among the 334 participants (51% Hispanic, 25% Black), depressive symptoms were associated with overperception of airflow obstruction (β = 0.14, p = .029), worse self-reported asthma control (β = 0.17, p = .003), and lower asthma-related quality of life (β = -0.33, p < .001), but not with lung function (β = -0.01, p = .82). Overperception was also associated with worse self-reported asthma control (β = 0.14, p = .021), but not lung function (β = -0.05, p = .41).

CONCLUSIONS

Depressive symptoms were associated with greater perceived impairment from asthma, but not pulmonary function. Overperception of asthma symptoms may play a key role in the relationship between depression and asthma outcomes in older adults.

Longitudinal Patterns of Mexican and Puerto Rican Children's Asthma Controller Medication Adherence and Acute Healthcare Use

Rationale: Researchers tend to study Latinos as a single group, but recent asthma research confirmed differences among Latino subgroups. Variations in controller medication adherence may be a factor in the observed health disparities between Mexican and Puerto Rican children. Adherence is not a stable phenomenon; however, there is a paucity of data on patterns of adherence, sociodemographic predictors of patterns, and variations in asthma-related acute healthcare use by adherence pattern among Latino subgroups. Objectives: To identify patterns of inhaled corticosteroid medication adherence over 12 months among Mexican and Puerto Rican children with persistent asthma, to examine sociodemographic predictors of adherence patterns by ethnicity, and to investigate asthma-related acute healthcare use based on these patterns. Methods: We analyzed controller medication Doser data from Mexican and Puerto Rican children (n = 123; ages 5-12 yr) with persistent asthma who participated with their caregivers in a longitudinal nonintervention study (Phoenix, AZ, and Bronx, NY). Interview and medical record data were collected at enrollment and at 3, 6, 9, and 12 months after enrollment. Results: Forty-seven to fifty-three percent of children had poor adherence (<50%) over each of the follow-up periods (cross-sectional). Children with lowest adherence were Puerto Rican, from nonpoor families, or female. Longitudinal latent class analysis yielded four adherence classes: poor, moderate, decreasing adherence, and increasing adherence. Puerto Rican children had significantly higher odds of "decreasing" (odds ratio [OR], 2.86; 95% confidence interval [CI], 0.40 to 20.50) and "poor" (OR, 5.62; 95% CI, 1.44 to 21.90) adherence than Mexican children. Females had significantly greater odds of "decreasing" (OR, 4.80; 95% CI, 0.73 to 31.74) and "poor" (OR, 5.20; 95% CI, 1.77 to 15.30) adherence group membership than males. The "decreasing" adherence group was comprised of only poor children. Children in the "poor" adherence class had the highest mean number of acute visits and emergency department visits/hospitalizations across all assessment periods. Conclusions: This study demonstrated that unique ethnicity within Latino populations may be associated with different risk levels for suboptimal controller medication adherence, which may be a factor in the observed asthma health disparities between Mexican and Puerto Rican children. Increased understanding of and attention to children's controller medication adherence patterns will provide evidence needed to identify children at highest risk for acute healthcare use and offer more-intensive intervention using less-intensive approaches for those at low risk. Clinical trial registered with www.clinicaltrials.gov (NCT01099800).

Applying Interactive Mobile health to Asthma Care in Teens (AIM2ACT): Development and design of a randomized controlled trial

Early adolescents have difficulties performing asthma self-management behaviors, placing them at-risk for poor asthma control and reduced quality of life. This paper describes the development and plans for testing an interactive mobile health (mHealth) tool for early adolescents, ages 12-15years, and their caregivers to help improve asthma management. Applying Interactive Mobile health to Asthma Care in Teens (AIM2ACT) is informed by the Pediatric Self-management model, which posits that helpful caregiver support is facilitated by elucidating disease management behaviors and allocating treatment responsibility in the family system, and subsequently engaging in collaborative caregiver-adolescent asthma management. The AIM2ACT intervention was developed through iterative feedback from an advisory board composed of adolescent-caregiver dyads. A pilot randomized controlled trial of AIM2ACT will be conducted with 50 early adolescents with poorly controlled asthma and a caregiver. Adolescent-caregiver dyads will be randomized to receive the AIM2ACT smartphone application (AIM2ACT app) or a self-guided asthma control condition for a 4-month period. Feasibility and acceptability data will be collected throughout the trial. Efficacy outcomes, including family asthma management, lung function, adolescent asthma control, asthma-related quality of life, and self-efficacy for asthma management, will be collected at baseline, post-treatment, and 4-month follow-up. Results from the current study will inform the utility of mHealth to foster the development of asthma self-management skills among early adolescents.

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.

Asthma Trigger Reports Are Associated with Low Quality of Life, Exacerbations, and Emergency Treatments

RATIONALE

Despite the importance of trigger perceptions for asthma diagnosis and management, associations among asthma triggers, affective disorders, and asthma outcome have received little attention.

OBJECTIVES

Because anxiety and depression are known to influence patients' health reports, we measured and controlled for these affective disorders in analyzing associations among patient perceptions of asthma triggers and asthma treatment outcomes.

METHODS

Patients from a nationally representative sample of respiratory specialist practices (N = 459) were assessed for clinically significant anxiety and depression and completed questionnaires on asthma triggers, quality of life, and asthma control. Physicians recorded exacerbation and emergency treatment frequencies in the prior year, spirometric lung function, and allergy test results. Hierarchical multiple regressions examined associations among reported trigger factors, anxiety, depression, and asthma outcomes, including quality of life, asthma control, exacerbations, emergencies, and spirometry.

MEASUREMENTS AND MAIN RESULTS

Patients across asthma severity levels were well represented. Anxiety and depression were associated with more frequent nonallergic, in particular psychological, triggers. Controlling for demographics, asthma severity, anxiety, and depression, nonallergic asthma triggers (including psychological triggers) explained substantial portions of variance in asthma control (total of 19.5%, odds ratios [ORs] = 2.07-1.37 for individual triggers), asthma-related quality of life (total of 27.5%, ORs = 3.21-1.49), and general quality of life (total of 11.3%, ORs = 1.93-1.55). Psychological triggers were consistently associated with exacerbations and emergency treatments (ORs = 1.96-2.04) over and above other triggers and affective disorders. Spirometric lung function was largely unrelated to perceived asthma triggers.

CONCLUSIONS

Patients' perceptions of asthma triggers are important determinants of asthma outcomes, which can help identify individuals at risk for suboptimal asthma management.

Blunted perception of neural respiratory drive and breathlessness in patients with cystic fibrosis

The electromyogram recorded from the diaphragm (EMG_di) and parasternal intercostal muscle using surface electrodes (sEMG_para) provides a measure of neural respiratory drive (NRD), the magnitude of which reflects lung disease severity in stable cystic fibrosis. The aim of this study was to explore perception of NRD and breathlessness in both healthy individuals and patients with cystic fibrosis. Given chronic respiratory loading and increased NRD in cystic fibrosis, often in the absence of breathlessness at rest, we hypothesised that patients with cystic fibrosis would be able to tolerate higher levels of NRD for a given level of breathlessness compared to healthy individuals during exercise.

15 cystic fibrosis patients (mean forced expiratory volume in 1 s (FEV₁) 53.5% predicted) and 15 age-matched, healthy controls were studied. Spirometry was measured in all subjects and lung volumes measured in the cystic fibrosis patients. EMG_di and sEMG_para were recorded at rest and during incremental cycle exercise to exhaustion and expressed as a percentage of maximum (% max) obtained from maximum respiratory manoeuvres. Borg breathlessness scores were recorded at rest and during each minute of exercise.

EMG_di % max and sEMG_para % max and associated Borg breathlessness scores differed significantly between healthy subjects and cystic fibrosis patients at rest and during exercise. The relationship between EMG_di % max and sEMG_para % max and Borg score was shifted to the right in the cystic fibrosis patients, such that at comparable levels of EMG_di % max and sEMG_para % max the cystic fibrosis patients reported significantly lower Borg breathlessness scores compared to the healthy individuals. At Borg score 1 (clinically significant increase in breathlessness from baseline) corresponding levels of EMG_di % max (20.2±12% versus 32.15±15%, p=0.02) and sEMG_para % max (18.9±8% versus 29.2±15%, p=0.04) were lower in the healthy individuals compared to the cystic fibrosis patients.

In the cystic fibrosis patients EMG_di % max at Borg score 1 was related to the degree of airways obstruction (FEV₁) (r=−0.664, p=0.007) and hyperinflation (residual volume/total lung capacity) (r=0.710, p=0.03). This relationship was not observed for sEMG_para % max.

These data suggest that compared to healthy individuals, patients with cystic fibrosis can tolerate much higher levels of NRD before increases in breathlessness from baseline become clinically significant. EMG_di % max and sEMG_para % max provide physiological tools with which to elucidate factors underlying inter-individual differences in breathlessness perception.

Patients with CF can tolerate higher levels of NRD before breathlessness becomes clinically significanthttp://ow.ly/Xp2q3

Asthma management self-efficacy in parents of primary school-age children

The aim of this study was to investigate asthma management self-efficacy in parents of primary school-age children with asthma and to explore possible associations between parent asthma management self-efficacy, parent and child characteristics, asthma task difficulty and asthma management responsibility. A cross-sectional descriptive survey of 113 parents was conducted to assess the level of parent asthma management self-efficacy, asthma task difficulty and confidence, asthma responsibility and socio-demographic characteristics. The findings indicate that parents had higher self-efficacy for attack prevention than attack management. Parents had higher self-efficacy for asthma management tasks that are simple, skills based and performed frequently such as medication administration and less confidence and greater difficulty with tasks associated with judgement and decision-making. Multivariate linear regression analysis identified English language, child asthma responsibility and parent education as predictors of higher asthma management self-efficacy, while an older child was associated with lower parent asthma management self-efficacy. The implications of these results for planning and targeting health education and self-management interventions for parents and children are discussed.

The adolescent with asthma

The adolescent with asthma experiences a period of physical and psychosocial changes that affect their health and well-being. Overall, adolescents with asthma are at increased risk for asthma morbidity and death. Increased rates of depression and anxiety, for the adolescent and their caregivers, can lead to non-adherence to their medical regimens, poor symptom control, and poor treatment outcomes. Contextual factors, such as race, ethnicity, and living situation, affect the prevalence, morbidity, and mortality for the adolescent with asthma. These factors also affect the transition process for adolescents entering adult medical care. An overview is presented of how the adolescent with asthma differs and how healthcare providers can promote effective asthma management and better asthma control.

Perception of bronchodilation assessed by Visual Analogue Scale in children with asthma

BACKGROUND

Visual Analogue Scale (VAS) has been proposed as a useful tool for assessing the perception of asthma symptoms, a cornerstone in disease management. While airway flow limitation and its reversibility are thought to be a useful marker of disease severity, there are very few studies that evaluated the response to bronchodilation (BD) testing perception by VAS. To investigate whether VAS assessment of breathlessness perception could provide a useful tool to assess the response to BD testing in asthmatic children.

METHODS

This cross-sectional study included a total of 150 children (96 males, mean age 11.05 years) with asthma, 50 had bronchial obstruction (i.e. FEV1 <80% of predicted). Perception of breathlessness was assessed by VAS; lung function was measured by spirometry. BD testing was performed in all children.

RESULTS

In children with bronchial obstruction, VAS at baseline was 4.7 and significantly increased to 6.9 (p<0.001) after BD. In children without bronchial obstruction, VAS at baseline was 7.4, but further significantly increased to 8.4 after BD testing (p<0.01). There was a significant difference in Δ VAS between children with bronchial reversibility and children without it (p<0.0001).

CONCLUSIONS

The present study demonstrates that VAS might be considered an initial tool to assess the BD response in children with asthma, mainly with overt bronchial obstruction.

Perceptual accuracy of upper airway compromise in children: Clinical relevance and future directions for research

Approximately 80% of children with asthma have coexisting allergic rhinitis. The accurate recognition and assessment of asthma and rhinitis symptoms is an integral component of guideline-based treatment for both conditions. This article describes the development and preliminary evaluation of a novel paradigm for testing the accuracy of children's assessment of their upper airway (rhinitis) symptoms. This work is guided by our previous research showing the clinical efficacy of tools to evaluate children's perceptual accuracy of asthma symptoms and linking accurate asthma symptom perception to decreased asthma morbidity (Fritz G, et al., Ethnic differences in perception of lung function: A factor in pediatric asthma disparities? Am J Respir Crit Care Med 182:12-18, 2010; Klein RB, et al., The Asthma Risk Grid: Clinical interpretation of symptom perception, Allergy Asthma Proc 251-256, 2004). The pilot study tests a paradigm that allows for the examination of the correspondence of children's assessment of their upper airway functioning with actual values of upper airway flow through the use of a portable, handheld nasal peak flowmeter. Nine children with persistent asthma were evaluated over a 4-week period. The article describes the rhinitis perceptual accuracy paradigm and reviews the results of a pilot study, showing a large proportion of inaccurate rhinitis symptoms "guesses" by the sample of children with persistent asthma. Patterns of inaccuracy, rhinitis control, and asthma morbidity are also described. Directions for future work are reviewed. The development of clinical tools to evaluate children's accuracy of rhinitis symptoms are needed, given the central role of the self-assessment of symptoms in guideline-based care. Accurate perception of the severity of rhinitis symptoms may enhance rhinitis control, lessen the burden of asthma, and prevent unnecessary emergency use among this high-risk group of children.

Perception of pulmonary function and asthma control: the differential role of child versus caregiver anxiety and depression

OBJECTIVE

To examine child and caregiver anxiety and depression as predictors of children's perception of pulmonary function, quick-relief medication use, and pulmonary function.

METHOD

97 children with asthma, ages 7 to 11 years old, reported their anxiety and depressive symptoms and completed spirometry. Caregivers completed a psychiatric interview. Children's predictions of their peak expiratory flow were compared with actual values across 6 weeks. Quick-relief medication use was assessed by Dosers.

RESULTS

Children's anxiety symptoms were associated with over-perception of respiratory compromise and greater quick-relief medication use. Children's depressive symptoms were associated with greater quick-relief medication use, but not perception of pulmonary function. Children of caregivers with an anxiety or depressive disorder had lower pulmonary function than children of caregivers without anxiety or depression.

CONCLUSIONS

Child anxiety was associated with a subjective pattern of over-perception. Caregiver anxiety and depression were risk factors for lower lung function assessed by objective measurement.

Perception of bronchoconstriction: a complementary disease marker in children with asthma

INTRODUCTION

Asthma guidelines use symptoms as the most important aspect of asthma control. Symptom perception varies widely between individuals. Over-perception as well as underperception of bronchoconstriction could have a negative effect on asthma management. We hypothesized that perception of bronchoconstriction in childhood asthma is not related to common measures of disease control. For that reason, we examined the clinical determinants of the perception of bronchoconstriction and the repeatability of perception measurements.

PATIENTS AND METHODS

In school-age children with moderately severe atopic asthma, we measured the perception of bronchoconstriction (decrease in forced expiratory volume in 1 second (FEV(1)) during methacholine bronchoprovocation challenges. The perception of bronchoconstriction was assessed as the slope of the relation between FEV(1) and Borg score, and as the Borg score at a 20% decrease in FEV(1) from baseline during the provocation test (PS(20)). Data from subjects who had a 20% or more decrease in FEV(1) (n = 112) were used for the analysis. Fifty-four children repeated the test after 3 months. Symptoms, use of rescue medication, and peak expiratory flows were scored in diaries during the 2 weeks before testing.

RESULTS

Symptom perception was significantly better in children without (PD(20) > 1570 μg, n = 28) than in children with airway hyperresponsiveness (PD(20) ≤ 1570 μg, n = 112), slope 0.22 versus 0.13 respectively (p < .001). Borg scores correlated with PD(20) (p = .01), baseline FEV(1) (only for slope, p = .04), and use of rescue beta agonist (p = .01), but not with other aspects of asthma control. Repeatability of Borg scores was good (slope: R = 0.59, PS(20): R = 0.52).

CONCLUSION

Poorer symptom perception in asthmatic children correlated with hyperresponsiveness, and was associated with lower baseline FEV(1) and less use of rescue bronchodilators. This suggests that the measurement of symptom perception should be taken into account in individual management plans for children with asthma.

Emotions and neural processing of respiratory sensations investigated with respiratory-related evoked potentials

OBJECTIVE

Patients with respiratory diseases such as asthma and chronic obstructive pulmonary disease frequently experience respiratory sensations, which are often perceived as unpleasant or threatening. However, the accurate perception of respiratory sensations is important for the management and treatment of these diseases. Emotions can substantially influence the perception of respiratory sensations and might affect the course of respiratory diseases, but the underlying neural mechanisms are poorly understood. The respiratory-related evoked potential (RREP) recorded from the electroencephalogram is a noninvasive technique that allowed first studies to examine the impact of emotions on the neural processing of respiratory sensations.

METHODS

In this review, we will briefly introduce the importance of the perception of respiratory sensations and the influence of emotions on respiratory perception. We then provide an overview on the technique of RREP and present a systematic review on recent findings using this technique in the context of emotions.

RESULTS AND CONCLUSIONS

The evidence currently available from studies in healthy individuals suggests that short-lasting emotional states and anxiety affect the later RREP components (N1, P2, P3) related to higher-order neural processing of respiratory sensations, but not the earlier RREP components (Nf, P1) related to first-order sensory processing. We conclude with a discussion of the implications of this work for future research that needs to focus on respiratory patient groups and the associated clinical outcomes.

The impact of emotion on the perception of graded magnitudes of respiratory resistive loads

Emotional state can modulate the perception of respiratory loads but the range of respiratory load magnitudes affected by emotional state is unknown. We hypothesized that viewing pleasant, neutral and unpleasant affective pictures would modulate the perception of respiratory loads of different load magnitudes. Twenty-four healthy adults participated in the study. Five inspiratory resistive loads of increasing magnitude (5, 10, 15, 20, 45 cm H(2)O/L/s) were repeatedly presented for one inspiration while participants viewed pleasant, neutral and unpleasant affective picture series. Participants rated how difficult it was to breathe against the load immediately after each presentation. Only at the lowest load, magnitude estimation ratings were greater when subjects viewed the unpleasant series compared to the neutral and pleasant series. These results suggest that negative emotional state increases the sense of respiratory effort for single presentations of a low magnitude resistive load but high magnitude loads are not further modulated by emotional state.

The impact of emotions on symptom perception in patients with asthma and healthy controls

Accurate perception of respiratory symptoms is highly important for course and treatment of asthma. Recent findings suggest that emotions can greatly impact respiratory symptom perception. This study compared the impact of emotions on respiratory symptom perception between patients with asthma and matched healthy controls. Pleasant and unpleasant emotional states were elicited by viewing emotional picture series while symptom reports and respiratory parameters were measured. Greater symptom report was observed for the unpleasant compared to the pleasant emotional state that was not related to respiratory parameters. Notably, this effect was comparable between patients with asthma and healthy controls. The present results suggest that the impact of emotions on respiratory symptom perception is a rather general phenomenon and not dependent upon previous experiences with asthma symptoms.

Looking at allergens increases symptom report in patients with allergic asthma

OBJECTIVE

Accurate symptom perception is highly important for self-management and clinical treatment of asthma. Recent findings suggest that psychological factors can greatly impact asthma symptom perception. This study examined whether looking at allergens would lead to changes in perceived asthma symptoms.

METHODS

Allergic asthma patients and healthy controls viewed picture series containing either allergens or neutral material. Symptom reports and respiratory parameters were measured.

RESULTS

The present results demonstrate that looking at pictures with allergens increases subjective symptom reports in patients with allergic asthma in the absence of changes in objective respiratory parameters, but not in healthy controls.

CONCLUSIONS

The results are suggestive of preceding learning processes during which patients have learned the association between visual representations of allergens and symptom-inducing effects of real contact with these allergens. This impacts asthma symptom perception without changes in respiratory status and might influence treatment decisions.

The effect of anxiety on respiratory sensory gating measured by respiratory-related evoked potentials

Respiratory sensory gating is evidenced by decreased amplitudes of the respiratory-related evoked potentials (RREP) N1 peak for the second (S2) compared to the first occlusion (S1) when two paired occlusions are presented with a 500-millisecond (ms) inter-stimulus-interval during one inspiration. Because anxiety is prevalent in respiratory diseases and associated with altered respiratory perception, we tested whether anxiety can modulate individuals' respiratory neural gating mechanism. By using high-density EEG, RREPs were measured in a paired inspiratory occlusion paradigm in 11 low and 10 higher anxious individuals with normal lung function. The N1 peak gating S2/S1 ratio and the N1 S2 amplitudes were greater in higher compared to low anxious individuals (p's<0.05). In addition, higher anxiety levels were correlated with greater S2/S1 ratios (r=0.54, p<0.05) and S2 amplitudes (r=-0.49, p<0.05). The results demonstrate that anxiety is associated with reduced respiratory sensory gating which might underlie altered respiratory symptom perception in anxious individuals.

Effect of peak flow monitoring on child asthma quality of life

The purpose of this study was to evaluate the effect of peak flow monitoring on asthma quality of life (QOL) for school-age children with asthma (N = 77) who participated in a 16-week asthma self-management program. QOL was measured using the Children's Health Survey for Asthma. Findings indicated significant improvement in asthma QOL from baseline to Week 16 and higher QOL scores for those with better asthma health outcomes.

A multi-factorial model for examining racial and ethnic disparities in acute asthma visits by children

BACKGROUND

Causes of children's asthma health disparities are complex. Parents' asthma illness representations may play a role.

PURPOSE

The study aims to test a theoretically based, multi-factorial model for ethnic disparities in children's acute asthma visits through parental illness representations.

METHODS

Structural equation modeling investigated the association of parental asthma illness representations, sociodemographic characteristics, health care provider factors, and social-environmental context with children's acute asthma visits among 309 White, Puerto Rican, and African American families was conducted.

RESULTS

Forty-five percent of the variance in illness representations and 30% of the variance in acute visits were accounted for. Statistically significant differences in illness representations were observed by ethnic group. Approximately 30% of the variance in illness representations was explained for whites, 23% for African Americans, and 26% for Puerto Ricans. The model accounted for >30% of the variance in acute visits for African Americans and Puerto Ricans but only 19% for the whites.

CONCLUSION

The model provides preliminary support that ethnic heterogeneity in asthma illness representations affects children's health outcomes.

Structural brain changes related to disease duration in patients with asthma

Dyspnea is the impairing, cardinal symptom patients with asthma repeatedly experience over the course of the disease. However, its accurate perception is also crucial for timely initiation of treatment. Reduced perception of dyspnea is associated with negative treatment outcome, but the underlying brain mechanisms of perceived dyspnea in patients with asthma remain poorly understood. We examined whether increasing disease duration in fourteen patients with mild-to-moderate asthma is related to structural brain changes in the insular cortex and brainstem periaqueductal grey (PAG). In addition, the association between structural brain changes and perceived dyspnea were studied. By using magnetic resonance imaging in combination with voxel-based morphometry, gray matter volumes of the insular cortex and the PAG were analysed and correlated with asthma duration and perceived affective unpleasantness of resistive load induced dyspnea. Whereas no associations were observed for the insular cortex, longer duration of asthma was associated with increased gray matter volume in the PAG. Moreover, increased PAG gray matter volume was related to reduced ratings of dyspnea unpleasantness. Our results demonstrate that increasing disease duration is associated with increased gray matter volume in the brainstem PAG in patients with mild-to-moderate asthma. This structural brain change might contribute to the reduced perception of dyspnea in some patients with asthma and negatively impact the treatment outcome.

Psychological considerations of the child with asthma

Asthma, the most common chronic disease in children and adolescents in industrialized countries, is typified by airway inflammation and obstruction leading to wheezing, dyspnea, and cough. However, the effect of asthma does not end with pulmonary changes. Research has shown a direct link between asthma and stress and psychiatric illness, which if untreated results in heightened morbidity and effects on society. The link between asthma and psychiatric illness, however, is often underappreciated by many pediatric and child mental health professionals. This article reviews the diagnosis and treatment of asthma as well as the correlation between asthma and psychiatric illness in children in an effort to improve management and treatment strategies for this prevalent disease.

WHO universal definition of severe asthma

PURPOSE OF REVIEW

In 2009, an expert panel met to propose a WHO definition of asthma severity and control, and criteria for describing exacerbations and their severity, which would be globally applicable. This review addresses their findings in the context of recent literature, and assesses the usefulness of these definitions in children in particular.

RECENT FINDINGS

Severe asthma was defined by the level of current clinical control and risks as: 'Uncontrolled asthma which can result in risk of frequent severe exacerbations (or death) and/or adverse reactions to medications and/or chronic morbidity (including impaired lung function or reduced lung growth in children)'. Severe asthma includes three groups, with different public health messages and challenges: untreated severe asthma, due to undiagnosed asthma or unavailability of therapy, difficult-to-treat severe asthma (due to adherence issues, inappropriate or incorrect use of medicines, environmental triggers or co-morbidity), and treatment-resistant severe asthma, including asthma for which control is not achieved despite the highest level of recommended treatment or asthma which is controlled only with the highest level of recommended treatment.

SUMMARY

These definitions will enable more precise measurement of the burden of severe childhood asthma globally. International collaborations in epidemiological and mechanistic studies, and randomized controlled trials of treatment, will be facilitated. However, both pathophysiology and severity are influenced by a number of factors with wide global variation; international comparisons should be interpreted with caution.

Adolescents' perception of asthma symptoms and health care utilization

INTRODUCTION

Pediatric asthma is accountable for a substantial use of health care services. The purpose of this study was to systemically examine the extent to which inaccurate perception of asthma symptoms is associated with the use of health care services.

METHODS

This exploratory study included 126 adolescents with asthma who were between 13 and 20 years of age. Subjects were classified as having inaccurate symptom perception (IG); well-controlled accurate symptom perception (WCA); and poorly controlled accurate symptom perception (PCA). These groups were compared with respect to health care utilization, including emergency department (ED) visits, hospitalization, and office visits and school absenteeism in the past 3 months.

RESULTS

More adolescents in the IG group had at least one hospitalization compared with adolescents in the PCA or WCA groups (23.1% vs. 11.1% vs. 2.6%, respectively). A similar trend was seen for ED visits. Compared with the WCA group, adolescents in the IG group were nearly nine times more likely to have been hospitalized, 3.4 times more likely to have visited an ED, and four times more likely to have missed school days.

DISCUSSION

Adolescents with inaccurate symptom perception are more likely to have hospitalizations, ED visits, and missed days from school compared with those who have accurate perceptions. The findings underscore the importance of screening for perceptual accuracy of asthma symptoms and call for interventions promoting accurate symptom assessment in adolescents with asthma to ensure appropriate care.

The impact of anxiety on the neural processing of respiratory sensations

Previous studies demonstrated that anxiety considerably impacts the reported perceptions of respiratory sensations. A novel feature of the current study is exploring the impact of anxiety on the neural processing of respiratory sensations elicited by short inspiratory occlusions during different affective contexts. Using high-density EEG, respiratory-related evoked potentials (RREP) were recorded in 23 low and 23 matched higher anxious individuals when viewing unpleasant or neutral picture series. Low anxious individuals showed the expected pattern of reduced magnitudes of later RREP components P2 and P3 during the unpleasant compared to the neutral affective context (p<0.05 and p<0.01). In contrast, higher anxious individuals showed greater magnitudes of P2 and P3 during the unpleasant compared to the neutral affective context (p's<0.05). Moreover, higher anxiety levels were correlated with greater magnitudes for P2 (r=0.44, p<0.01) and P3 (r=0.54, p<0.001) during the unpleasant relative to the neutral affective context. Earlier components of the RREP (Nf, P1, N1) were not affected by anxiety. This study demonstrates that anxiety affects the later, higher-order neural processing of respiratory sensations, but not its earlier, first-order sensory processing. These findings might represent a neural mechanism that underlies the increased perception of respiratory sensations in anxious individuals.

Habituation in neural processing and subjective perception of respiratory sensations

Reduced perception of respiratory sensations is associated with negative treatment outcome in asthma. We examined whether habituation in the neural processing of repeatedly experienced respiratory sensations may underlie subjective reports of reduced respiratory perception. Respiratory-related evoked potentials (RREP) elicited by inspiratory occlusions and reports of respiratory perception were compared between early and late experimental periods in healthy subjects. Reports of respiratory perception were reduced during late, compared to early, experimental periods. This was paralleled by reduced magnitudes in RREP components N1, P2, and P3 in late, compared to early, experimental periods. Habituation in the neural processing of respiratory sensations is a potential mechanism that underlies subjective reports of reduced respiratory perception and might represent a risk factor for reduced perception of respiratory sensations in asthma.

Airway obstruction at time of symptoms prompting use of reliever therapy in children with asthma

BACKGROUND

In asthma treatment, doses of inhaled corticosteroids are often adapted to symptoms and need for bronchodilators. However, in cross-sectional studies in emergency room settings, lung function and respiratory symptoms are not always concordant. Available longitudinal data are based on written peak flow diaries, which are unreliable. Using home spirometry, we studied prospectively whether mild respiratory symptoms, prompting reliever therapy are accompanied by a clinically relevant drop in lung function in children with asthma.

METHODS

For 8 weeks, children with asthma scored symptoms and measured peak expiratory flow (PEF) and forced expiratory volume in 1 sec (FEV(1)) on a home spirometer twice daily. Additional measurements were recorded when respiratory symptoms prompted them to use bronchodilators.

RESULTS

The mean difference between symptom free days and at times of symptoms was 6.6% of personal best for PEF (95% CI: 3.2-10.0; p = 0.0004) and 6.0% of predicted for FEV(1) (95% CI: 3.0-9.0; p = 0.0004). There was complete overlap in PEF and FEV(1) distributions between symptom free days and at times of symptoms.

CONCLUSIONS

Although statistically significant, the degree of airway narrowing at times of respiratory symptoms, prompting the use of reliever therapy, is highly variable between patients, limiting the usefulness of home spirometry to monitor childhood asthma.

Psychological considerations of the child with asthma

Asthma, the most common chronic disease in children and adolescents in industrialized countries, is typified by airway inflammation and obstruction leading to wheezing, dyspnea, and cough. However, the effect of asthma does not end with pulmonary changes. Research has shown a direct link between asthma and stress and psychiatric illness, which if untreated results in heightened morbidity and effects on society. The link between asthma and psychiatric illness, however, is often underappreciated by many pediatric and child mental health professionals. This article reviews the diagnosis and treatment of asthma as well as the correlation between asthma and psychiatric illness in children in an effort to improve management and treatment strategies for this prevalent disease.

Ethnic differences in perception of lung function: a factor in pediatric asthma disparities?

RATIONALE

Disparities in pediatric asthma exist in that Latino children have higher prevalence and greater morbidity from asthma than non-Latino white children. The factors behind these disparities are poorly understood, but ethnic-related variations in children's ability to accurately recognize and report their pulmonary functioning may be a contributing process.

OBJECTIVES

To determine (1) if differences exist between Latino and non-Latino white children's perceptual accuracy and (2) whether these differences are related to asthma outcomes.

METHODS

Five hundred and twelve children, aged 7-16 years (290 island Puerto Ricans, 115 Rhode Island Latinos, and 107 Rhode Island non-Latino white children) participated in a 5-week home-based protocol in which twice daily they entered subjective estimates of their peak expiratory flow rate into a hand-held, programmable spirometer and then performed spirometry. Their accuracy was summarized as three perceptual accuracy scores. Demographic data, asthma severity, intelligence, emotional expression, and general symptom-reporting tendencies were assessed and covaried in analyses of the relationship of perceptual accuracy to asthma morbidity and health care use.

MEASUREMENTS AND MAIN RESULTS

Younger age, female sex, lower intelligence, and poverty were associated with lower pulmonary function perception scores. Island Puerto Rican children had the lowest accuracy and highest magnification scores, followed by Rhode Island Latinos; both differed significantly from non-Latino white children. Perceptual accuracy scores were associated with most indices of asthma morbidity.

CONCLUSIONS

Controlling for other predictive variables, ethnicity was related to pulmonary function perception ability, as Latino children were less accurate than non-Latino white children. This difference in perceptual ability may contribute to recognized asthma disparities.

Peak flow monitoring in pediatric asthma management: a clinical practice column submission

Peak expiratory flow (PEF) monitoring has long been a mainstay of asthma management, but controversy surrounds its efficacy in the pediatric population, and little published research exists on the subject. PEF is both effort and technique dependent and is not suitable for use in children under the age of 5 or with developmental disabilities. However, PEF is useful for monitoring airway changes if used properly, especially in that segment of the population labeled as "poor perceivers" of worsening symptoms. The authors review existing literature on the subject, including the newly revised National Heart, Lung, and Blood Institute (National Heart, Lung, and Blood Institute, National Institutes of Health, U.S. Department of Health and Human Services. (2007). Expert panel report 3: Guidelines for the diagnosis and management of asthma-full report 2007. Retrieved June 17, 2008, from http://www.nhlbi.nih.gov/guidelines/asthma/asthgdln.htm) evidence-based guidelines.

Asthma symptom perception and obesity in children

This study examined the relationship between obesity and asthma symptom perception in 200 youth with asthma. Repeated subjective and objective peak flow measurements were summarized using the Asthma Risk Grid (Klein et al., 2004), resulting in Accurate, Symptom Magnification and Danger Zone scores. Analyses were stratified by age and included ethnicity. For younger children, obesity was not significantly related to perception scores. For older children, a significant obesity-by-ethnicity interaction for Accurate Symptom Perception scores indicated that obese white children had lower accuracy than white nonobese children, while there was no difference for obese versus nonobese minority children. Obesity was also related to higher Symptom Magnification scores regardless of ethnicity for older children. These findings suggest that obesity may complicate asthma management by interfering with the ability to accurately perceive symptoms for some patients. More remains to be learned about the role of sociodemographic factors underlying this relationship.

Asthma education and monitoring: what has been shown to work

Cochrane systematic reviews and meta-analyses on education and monitoring of asthmatic children have come to divergent conclusions, mainly because of the heterogeneity of education programmes and patients. There is little doubt that education is useful. However, the useful components of the education programmes remain to be elucidated, not only by randomized controlled trials but also by observational studies performed within distinct asthma phenotypes. Any education and monitoring package needs to contain basic explanation about the disease and its influencing factors, as well as inhalation instructions. There is no good evidence to justify home monitoring of lung function; symptom monitoring suffices. Probably, the crucial part of asthma education programmes is a high level of agreement between patient and doctor regarding the goals of the treatment (patient-doctor partnership). Therefore, further exploration of the patient's needs should be worthwhile.