Asthma is a complex and heterogeneous disease. Severe asthma is recognised as a major unmet need that poses a great burden on the healthcare system. While accounting for only a small proportion of the total asthmatic population, asthma-related costs are 1.7 to 4-fold higher than those observed in the mild-persistent asthma population and the associated personal and societal impact is significant. Severe asthma is not considered to be a single disease, but can be divided into several phenotypes, owing to the variety of inflammatory, clinical and functional characteristics that it can present with. One of the proposed and most studied phenotypes is severe eosinophilic asthma. Patients with severe asthma that is accompanied with a high concentration of eosinophils require greater healthcare resource use, overall greater disease management costs and have a much more impaired QoL than those who do not present with raised eosinophilia. While the number of targeted treatments for asthma management has been growing in recent years, the heterogeneity of clinical presentations, treatment responses and inflammatory processes involved represents an added challenge for health care professionals. Thus, severe asthma management is a complex endeavour and a thorough and up to date understanding of the pathophysiologic characteristics of the patient population promotes effective therapeutic decision-making. The purpose of this observational, cross-sectional, multicentre study is to determine the prevalence of an eosinophilic phenotype of blood eosinophil count \> 300 cells/mm3 among severe asthma patients followed at Brazilian sites specialized in the management of severe asthma. The prevalence of an atopic phenotype, asthma control, QoL and burden of disease will also be studied.
Knowledge of the prevalence of eosinophilia among adult, severe asthma patients in Brazil is limited. Moreover, data on the prevalence of an atopic phenotype within the adult, severe asthma population is scarce. Severe asthma management is a complex endeavour and a thorough and up to date understanding of the pathophysiologic characteristics of the patient population facilitates therapeutic decisions that effectively lead to disease control. The purpose of this observational, cross-sectional, multicentre study is to determine the prevalence of an eosinophilic phenotype of blood eosinophil count \> 300 cells/mm3 among severe asthma patients followed at Brazilian sites specialized in the management of severe asthma. The prevalence of an atopic phenotype, asthma control, QoL and burden of disease will also be studied. It is expected that this study will contribute to the understanding of severe asthma in Brazil, ultimately helping to inform therapeutic decisions and addressing patients' needs.
Study Type
OBSERVATIONAL
Enrollment
414
Research Site
Blumenau, Brazil
Research Site
Goiânia, Brazil
Research Site
Londrina, Brazil
Research Site
Porto Alegre, Brazil
Research Site
São Paulo, Brazil
Research Site
Sorocaba, Brazil
Prevalence of an eosinophilic phenotype of blood eosinophil count > 300 cells/mm3 among severe asthma patients in Brazil.
Time frame: 8-month
Prevalence of an eosinophilic phenotype of blood eosinophil count > 150 cells/mm3.
Time frame: 8-month
Prevalence of an atopic phenotype, defined by a pre-existing history of atopy and total serum IgE > 100 UI/mL.
Time frame: 8-month
Prevalence of atopy, as defined by a pre-existing history of atopy and total serum IgE > 100 UI/mL, among patients that present an eosinophilic phenotype of blood eosinophil count > 300 cells/mm3.
Time frame: 8-month
Annual exacerbation rate.
Time frame: 12-month
Patient-reported QoL using the St. George's Respiratory Questionnaire (SGRQ) results.
The SGRQ allows for the assessment of QoL of asthma patients. The questionnaire evaluates three domains: patient's perception of their recent respiratory problems (Symptoms score), disturbances to daily physical activity (Activity score) and disturbances of psycho-social function (Impact score). The score of each component and a total score can be computed. Scores are expressed as a percentage of overall impairment, where 100 represent the worst health status and 0 indicates the best status. Variables to collect: Symptoms score, Activity score, Impact score and Total score.
Time frame: 8-month
Asthma control using the Asthma Control Questionnaire 7 (ACQ 7) results.
The ACQ 7 allows for the evaluation of asthma control. Subjects will be asked to respond to six questions pertaining to asthma-related symptoms and bronchodilator use on a 7-point scale (where 0=no impairment and 6=maximum impairment). The seventh question will be answered by the study's team at the research center and involves scoring the FEV1% predicted on a 7-point scale. The total ACQ 7 score is computed through the mean of the 7 questions and, as such, varies between 0 (totally controlled asthma) and 6 (severely uncontrolled asthma). Variables to collect include the responses to each of the questionnaire's individual items.
Time frame: 8-month
Burden of disease using the GAD 7 scale.
The Generalized Anxiety Disorder (GAD -7) is a self-administered patient questionnaire used as a screening tool and as a severity measure for patients with generalized anxiety disorder. It is composed by 7 items: (1) feeling nervous, (2) not being able to stop or control worrying, (3) worrying too much about different things, (4) trouble relaxing, (5) being so restless that it is hard to sit still, (6) becoming easily annoyed or irritable, and (7) feeling afraid as if something awful might happen. Through a 4-point Likert scale from 'not at all' to 'nearly every day', it is asked how often the patient has been bothered by any of the presented problems. The GAD-7 index is obtained by adding the scores from the questionnaire, after having assigned 0 to the least severe situation, 3 to the most severe one, and 1 and 2 to the intermediate ones. The cut off points 5, 10 and 15 allow to classify the anxiety as none/normal (0-4), mild (5-9), moderate (10-14), and severe (15-21).
Time frame: 8-month
Burden of disease using the PHQ-9.
The Patient Health Questionnaire (PHQ) is a self-administered instrument for common mental disorders. The PHQ-9 is the depression module from the full PHQ and consists of 9 questions that assess the presence of each of the symptoms for the episode of major depression. The PHQ-9 score can range from 0-27, since each of the 9 items can be scored from 0-3 corresponding to "no at all", "several days", "more than half the days" and "nearly every day" responses, respectively. Major depression is diagnosed if 5 or more symptoms have been present at least "more than half the days" in the past 2 weeks, and 1 of the symptoms is depressed mood or anhedonia. Other depression is diagnosed if 2, 3, or 4 symptoms have been present at least "more than half the days" in the past 2 weeks, and 1 of the symptoms is depressed mood or anhedonia. One of the 9 symptom ("thoughts that you would be better off dead or of hurting yourself in some way") counts if present at all, regardless of duration.
Time frame: 8-month
Burden of disease using the WPAI: Asthma questionnaire results.
The WPAI assess the subject's ability to work and perform regular activities. The questionnaire inquiries about the number of days and hours missed from work or general activities. It also asks patients to rate, on a scale from 0 to 10, the degree to which asthma impairs productivity at work and their ability to perform normal daily activities. Higher values represent a more-severe impact. Variables to collect include the responses to each of the questionnaire's individual items.
Time frame: 8-month
Chronic oral corticosteroid (OCS) rate.
Time frame: 8-month
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