Causative and contributive factors to asthma severity and patterns of medication use in patients seeking specialized asthma care.

Hamilos DL.

Department of Pediatrics, Washington University School of Medicine, St. Louis, MO 63110, USA.

STUDY OBJECTIVES: (1) To assess the prevalence of specific factors considered causative or contributive to asthma in a population of patients seen in a specialized asthma clinic, and to determine whether any of these factors were associated with more severe disease; and (2) to assess the utilization of inhaled steroids by asthma severity in this population and compare it with published guidelines of the National Heart, Lung, and Blood Institute (NHLBI). DESIGN, SETTING, AND PATIENT POPULATION: We conducted a retrospective chart review of new patients seen in a specialized asthma treatment center over a 2.5-year period and recorded the prevalence of 14 causative or contributive factors, the severity of asthma, and the intensity of treatment with inhaled corticosteroids in each patient. Patients were grouped as mild asthma vs moderate/severe asthma and compared by chi(2) analysis and stepwise logistic regression to determine whether certain factors were associated with more severe asthma. MEASUREMENTS AND RESULTS: The average number of factors recorded was 2.9 +/- 1.8 in the mild group (+/- SD) and 3.5 +/- 1.6 in the moderate/severe asthma group. This difference was statistically significant (p = 0.014). Increasing age, male gender, symptomatic gastroesophageal reflux disease (GERD), and chronic sinusitis were independently associated with more severe asthma. Suboptimal use of inhaled corticosteroids was more common in patients with mild persistent asthma, but suboptimal dosing of inhaled corticosteroids was equally common in mild and moderate/severe asthma. No relationship was found between allergen sensitization combined with exposure to cats, dogs, dust mite, or molds and more severe asthma. CONCLUSIONS: This study confirms earlier studies showing that symptomatic GERD and chronic sinusitis are important comorbid conditions in patients with asthma, both being associated with greater asthma severity. This study further shows that the doses of inhaled corticosteroids used for treatment of asthma fall short of NHLBI guidelines in the majority of patients regardless of asthma severity.

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Mental disorders and asthma in the community.

Thefeld W.

Institute of Clinical Psychology and Psychotherapy, Technical University of Dresden, Dresden, Germany.

OBJECTIVE: To determine the association between asthma and mental disorders among adults in the community. SETTING: Germany. PARTICIPANTS: Representative sample of the general population aged 18 to 65 years. MAIN OUTCOME MEASURES: Diagnoses of current (the past 4 weeks) and lifetime asthma were based on physician diagnosis; current and lifetime DSM-IV mental disorders were assessed using the Composite International Diagnostic Interview. RESULTS: Current severe asthma (the past 4 weeks) was associated with a significantly increased likelihood of any anxiety disorder (odds ratio [OR], 2.65; 95% confidence interval [CI], 1.35-5.18), specific phobia (OR, 4.78; 95% CI, 2.35-4.05), panic disorder (OR, 4.61; 95% CI, 1.09-9.4), and panic attacks (OR, 4.12; 95% CI, 1.32-12.8). Lifetime severe asthma was associated with the increased likelihood of any anxiety disorder (OR, 2.09; 1.3-3.36), panic disorder (OR, 2.61; 95% CI, 1.29-5.25), panic attacks (OR, 2.84; 95% CI, 1.66, 4.89), social phobia (OR, 3.28; 95% CI, 1.42, 7.59), specific phobia (OR, 2.93; 95% CI, 1.71-5.0), generalized anxiety disorder (OR, 5.51; 95% CI, 2.29-13.22), and bipolar disorder (OR, 5.64; 95% CI, 1.95-16.35). Current nonsevere asthma was associated with the increased likelihood of any affective disorder (OR, 2.42; 95% CI, 1.03-5.72); and lifetime nonsevere asthma was associated with increased odds of any anxiety disorder (OR, 1.51; 95% CI, 1.0-2.32), anxiety disorder not otherwise specified (OR, 2.08; 95% CI, 1.03-4.23), and any somatoform disorder (OR, 1.7; 95% CI, 1.14-2.53). CONCLUSIONS: To our knowledge, these findings are consistent with and extend the findings of previous reports by providing the first available information on the association between physician-diagnosed asthma and DSM-IV mental disorders in a representative population sample of adults. Our results suggest an association between asthma and a range of mental disorders. Longitudinal studies that can examine the sequence of onset and the role of genetic and environmental factors in the association between asthma and affective and anxiety disorders are needed next to further elucidate possible shared causative mechanisms.

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Understanding the impact of asthma in the 21st century.

Turk A.

OBJECTIVE: To describe the current status of asthma management in the United States, including the role of the Guidelines for the Diagnosis and Management of Asthma, developed by the National Institutes of Health (NIH), and the Health Plan Employer Data and Information Set (HEDIS) 2000, developed by the National Committee for Quality Assurance (NCQA). DATA SOURCES: This article is based on a presentation given by the author at a symposium entitled.Optimizing Clinical and Economic Outcomes in Asthma Management. at the Academy of Managed Care Pharmacy.s 2000 Educational Conference in San Diego, California, on October 5, 2000. CONCLUSIONS: Health care professionals have not yet fully convinced patients that asthma is a chronic disease requiring appropriate medication therapy and routine follow-up care. Asthma is often treated episodically, which is related to increased emergency room visits, hospitalizations, and acute-care visits. The appropriate treatment of asthma incorporates concepts from the NIH guidelines and begins with accurately classifying asthma based on pulmonary function and clinical symptoms. Inhaled corticosteroids (ICSs) are preferred first-line therapy for children as well as adults with persistent asthma. HEDIS 2000 defined a performance measure for asthma with which health care plans can be compared; this measure is based on administrative rather than clinical parameters. Use of fewer canisters of short-acting beta2-agonists per year is associated with relatively less risk of hospitalization for patients using ICS; even low-dose ICS therapy is effective in decreasing the asthma death rate.

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Interrelationships among asthma, atopy, rhinitis and exhaled nitric oxide in a population-based sample of children.

Caillaud D.

Physiology and Pulmonary Department, Clermont-Ferrand, France.

BACKGROUND: Exhaled nitric oxide (eNO) has attracted increasing interest as a non-invasive marker of airway inflammation in asthma. However, little evidence exists on the influences exerted on eNO by the interrelations among atopic status, asthma and rhinitis. METHODS: Among the 1156 children who participated in a large-scale epidemiological survey on asthma and allergies (ISAAC II: International Study of Asthma and Allergies in Childhood Phase II) in the city of Clermont-Ferrand, 53 asthmatics without corticosteroid treatment and 96 non-asthmatics were invited to perform eNO and skin prick tests (SPTs) to 12 common allergens. RESULTS: Atopic asthmatic children had higher eNO than non-atopic asthmatic children (28.9+/-9.1 vs. 17.1+/-13.1 p.p.b.; P=0.0004) with a significant increase when one SPT or more are positive (26.5+/-7.8 vs. 17.1+/-13.1 p.p.b.; P=0.03). Similarly, non-asthmatic, atopic subjects had higher eNO than non-atopic subjects with a significant increase when two SPTs or more are positive (19.4+/-9.8 vs. 11.7 +/-6.7 p.p.b.; P=0.003). In the case of equal levels of positive SPTs (0, 1, >/=2), asthmatic children always had higher eNO than non-asthmatic ones. Furthermore, among non-asthmatic children, the eNO level increased only in atopics who had rhinitis (20.7+/-13 vs. 12.5+/-6.4 p.p.b. in atopic controls (subjects without rhinitis and asthma) and 12.3+/-6.6 p.p.b. in non-atopic controls; P=0.001), whereas among asthmatic children, eNO level increased in atopics independently of rhinitis (28.2+/-9.5 p.p.b. in those with rhinitis and 30.9+/-8.1 p.p.b. in those without) as well as in non-atopics with rhinitis (22.5+/-17.2 p.p.b.). CONCLUSIONS: Our data suggest that besides atopy and asthma, allergic rhinitis should also be taken into account in the assessment of eNO.

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Lower bronchodilator responsiveness in Puerto Rican than in Mexican subjects with asthma.

Genetics of Asthma in Latino Americans (GALA) Study.

University of California, San Francisco, 94143-0833, USA. eburch itsa.ucsf.edu

In the United States, Puerto Ricans and Mexicans have the highest and lowest asthma prevalence, morbidity, and mortality, respectively. To determine whether ethnicity-specific differences in therapeutic response, clinical response, and/or genetic factors contribute to differences in asthma outcomes, we compared asthma-related clinical characteristics among 684 Mexican and Puerto Rican individuals with asthma recruited from San Francisco, New York City, Puerto Rico, and Mexico City. Puerto Ricans with asthma had reduced lung function, greater morbidity, and longer asthma duration than did Mexicans with asthma. Bronchodilator responsiveness, measured as percentage change from baseline FEV1, was significantly lower among Puerto Ricans with asthma than among Mexicans with asthma. Puerto Ricans with asthma had on average 7.3% (95% confidence interval [CI], 4.6 to 9.9; p < 0.001) lower bronchodilator reversibility in FEV1, higher risk of an emergency department visit in the previous year (odds ratio, 2.63; 95% CI, 1.6 to 4.3; p < 0.001), and of previous hospitalization for asthma (odds ratio, 1.94; 95% CI, 1.2 to 3.2; p = 0.009) than Mexicans. Subgroup analysis corroborated that Puerto Ricans with asthma had more severe disease than did Mexicans on the basis of lung function measurements, responsiveness to beta2-adrenergic agonists, and health care use. We conclude that Puerto Ricans with asthma respond less to albuterol than do Mexicans with asthma. These findings underscore the need for additional research on racial/ethnic differences in asthma morbidity and response to therapy.

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Body-mass index as a predictor of incident asthma in a prospective cohort of children.

Berkey CS.

Channing Laboratory, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA. diane.gold channing.harvard.edu

An epidemic rise in asthma has occurred concurrently with a rise in overweight among United States children, but it is unclear whether body weight affects the risk of incident childhood asthma. We studied the prospective relation of body-mass index (BMI) to incident asthma in a longitudinal study of 9,828 children aged 6-14 years, examined annually over a median follow-up time of 5 years in six US cities. An increased risk of a new asthma diagnosis in girls was associated with higher BMI at entry into the study (P=0.009) and greater increase in BMI during follow-up (P=0.0003). Compared with girls in the leanest quintile of BMI at entry (age taken into account), girls in the top quintile of adiposity had 2.2 times greater risk of incident asthma with any wheeze in subsequent years. Girls with the largest annual rate of increase in BMI (top compared to bottom quintile, age taken into account) had 1.5 times the risk of asthma with any wheeze, and 2.2 times the risk of asthma with persistent wheeze. Boys with the largest and smallest annual changes in BMI also had an increased risk of asthma. For girls, overweight contributes to development of asthma. For boys and girls, extremes of annual BMI growth rates increase the risk of asthma. Copyright 2003 Wiley-Liss, Inc.

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Quality of life in adolescents with mild asthma.

Sullivan SD.

Division of Pulmonary and Critical Care Medicine, Department of Medicine, University of Washington, Seattle, Washington 98195-6522, USA. tealh u.washington.edu

The majority of individuals with asthma have mild disease, often in conjunction with allergic rhinitis and exercise-induced bronchoconstriction (EIB). Although health-related quality-of-life (HRQoL) is reduced in moderate to severe asthma and allergic rhinitis, little is known about the effect of mild asthma, mild allergic rhinitis, and EIB on HRQoL outcomes. The objective of this study was to determine the effect of mild asthma, allergic rhinitis, and EIB on HRQoL. A cross-sectional study was conducted of 160 adolescent athletes participating in a screening program to detect EIB. Generic HRQoL was assessed with the teen version of the pediatric quality-of-life inventory (PedsQL). Prior diagnoses of asthma, allergic rhinitis, and EIB, and current symptoms of dyspnea during exercise and asthma, were recorded. Lung function and the presence of EIB were determined by spirometry before and after an exercise challenge test. Adolescent athletes with a prior physician diagnosis of asthma had a lower HRQoL scale summary score (P<0.01) and lower physical functioning, emotional functioning, and school functioning domain scores (P values, 0.01-0.02) in comparison to adolescent athletes with no prior diagnosis of these disorders. Athletes with a prior diagnosis of asthma reported dyspnea during exercise more frequently than did those without asthma (P<0.001). Adolescent athletes with dyspnea during exercise had a lower scale summary score, and lower physical functioning, general well-being, and emotional functioning domain scores (P values, 0.02-0.03). These data show that mild asthma and dyspnea without asthma significantly affect HRQoL. Symptoms of dyspnea during exercise are common in asthma and are associated with lower HRQoL. The clinical significance of these differences in HRQoL is unclear. Copyright 2003 Wiley-Liss, Inc.

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Prostaglandin E2 in the expired breath condensate of patients with asthma.

Loukides S.

Pneumonology and Clinical Research Dept, Athens Army General Hospital, Athens, Greece.

Inhaled prostaglandin (PG)E2 has been found to cause bronchodilation in asthmatics, although it does not have bronchodilative effects in normal subjects. The aim of this study was to investigate the levels of PGE2 in the expired breath condensate of patients with asthma, the possible contribution of smoking habit to its levels and the possible relationship between PGE2 and the degree of bronchial hyperresponsiveness, as assessed by the provocation dose of histamine causing a 20% fall in forced expiratory volume in one second (FEV1) (PD20). A total of 30 mild asthmatics (15 smokers, all steroid-naive, FEV1 88+/-6 (%+/-SD)) and 20 healthy control subjects (10 smokers) were studied. Histamine challenge testing was performed in all subjects and the PD20 was determined. The results showed that asthmatic smokers had significantly higher values of PGE2 compared to asthmatic nonsmokers and control subjects (40+/-21 versus 14.5+/-4.5 versus 11.7+/-3 pg x mL(-1), respectively). Further analysis showed that PGE2 levels were significantly higher in asthmatic smokers compared to smoker and nonsmoker controls (40+/-21 versus 11.6+/-2 versus 11.7+/-4 pg x mL(-1), respectively). No significant difference was observed between asthmatic nonsmokers and both control smokers and control nonsmokers. No significant correlation was found between PGE2 levels and PD20 in all groups of asthmatics, irrespective of smoking habit. In conclusion, the elevation of prostaglandin E2 in the expired breath condensate of patients with asthma is mainly attributed to smoking habit and prostaglandin E2 levels do not predict the degree of bronchial hyperresponsiveness.

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