Comprehensive Observational Study in a Large Cohort of Asthma Patients after Adding LAMA to ICS/LABA

195
0
2023-11-15 17:17
MDPI
PTLv2
Followers:3Columns:927

1. Introduction

Asthma is a heterogeneous disease, usually characterized by chronic airway inflammation. It is defined by a history of respiratory symptoms such as wheeze, shortness of breath, chest tightness and cough, that change in intensity over time, and a varying airflow limitation [1]. Genetic and epigenetic variations, sometimes related to ethnicity, play an important role in asthma susceptibility [2,3]. While children tend to have more genetically driven asthma onset, adults are prone to genetic, environment and comorbidity components interfering with its onset [2]. Epigenetic modifications (DNA hypo- and hypermethylation, histone acetylation/deacetylation/methylation, or variations in microRNA expression) have been observed in epithelial and immune cells [2]. Although asthma prevalence has decreased since 1990, it is the second most prevalent chronic respiratory disease worldwide [4]. It is estimated that 33% of the population between 5–80 years old will develop asthma throughout life, most of them before they reach 20 years old [5]. In Spain, the prevalence of asthma ranges between 2.5% and 13.5%, depending on age, setting, or recording method [6,7]. Despite mortality rates having remained stable for the last 25 years, asthma still causes 2.44 deaths per 100,000 inhabitants, mostly among women [8,9]. According to the Global Burden of Disease Study in 2017, 69% of new cases of chronic respiratory diseases (42,780,000) accounted for asthma; the age-standardized years of life lost rate per 100,000 was 152.8 (108.3 to 195.8) in 2017; and the all-age death rate reached 6.3 (4.3 to 8.2) [10]. Due to its mortality and impact on patients’ quality of life, asthma implies a high burden for healthcare systems and society [4,11,12,13,14]. The clinical burden, which affects even mild asthma patients [15], includes restrictions on daily physical/social activities or sports, and sleep problems [15,16]. Additionally, asthma may result in exacerbations or persistent airflow limitations, greater exposure to oral corticosteroids, increased visits to the emergency department (ED), and hospitalizations [15,16,17].

Asthma is often found to coexist with pulmonary (allergic rhinitis, chronic rhinosinusitis, chronic obstructive pulmonary disease, etc.) or extrapulmonary (gastroesophageal reflux disease, cardiovascular diseases, obesity, etc.) comorbidities [18]. The treatment of some of these comorbidities have managed to decrease exacerbations and airway obstructions, and improve health-related quality of life (HRQoL) and asthma management [18].

The management of asthma aims to achieve good symptom control, and minimize exacerbations, the side effects of treatments, and the risk of mortality [1,7] using pharmacological and non-pharmacological approaches [19]. Treatment with high doses of inhaled corticosteroids (ICS) plus long-acting β2 agonists (LABA) is recommended in severe, persistent asthma. However, in cases where asthma is not well controlled, adding a long-acting muscarinic antagonist (LAMA), like tiotropium or glycopyrronium, to the LABA/ICS therapy, as a single or multiple inhaler triple therapy (MITT), is recommended [1,20,21]. A recent review on uncontrolled asthma patients treated with medium or high doses of ICS + LABA showed that LAMA as an add-on therapy reduced asthma symptoms (assessed by diverse questionnaires), exacerbations, and increased lung function (measured using forced expiratory volume in the first second [FEV1], peak expiratory flow and impulse oscillometry parameters, and multiple pulmonary function tests) [22]. LAMA block acetylcholine receptors on airway smooth muscle cells, glands, and nerves, easing muscle contraction and mucus secretion [23].

Treatment with LAMA in combination with LABA/ICS improves lung function and increases the time to severe exacerbations requiring oral corticosteroids [1,20,24]. Furthermore, a recent metanalysis of randomized clinical trials showed that the triple therapy (TT) (LABA/ICS/LAMA) was associated with a reduction in severe exacerbation risk and an improvement in asthma control in comparison to dual therapy (DT) (LABA/ICS) [25]. Another metanalysis showed that triple therapies with medium or high doses of ICS with LABA and LAMA in a single inhaler were effective in achieving asthma control, with no safety concerns [26]. However, the effectiveness of the TT vs. DT in clinical practice has scarcely been analyzed. Suzuki et al. conducted a retrospective, observational study to investigate the treatment patterns and disease burden in patients with asthma who initiated MITT therapy (LABA/ICS + LAMA). They showed that the add-on therapy treatment with tiotropium reduced the incidence of overall exacerbations and exacerbations requiring hospitalization in patients who were being treated with DT [27]. Another study [28] compared the effectiveness and use of healthcare resources when adding tiotropium to ICS/LABA vs. increasing the ICS/LABA dose in a real-world cohort of patients with asthma. The TT had better effectiveness, which implied a reduction in the use of healthcare resources such as ED visits and hospitalizations [28]. Therefore, as add-on therapies, LAMA may reduce the direct and indirect costs associated with the management of asthma. Other randomized controlled studies, gathered in a recent review by Muiser et al. (TALC [n = 210], PrimoTinA [n = 912], MezzoTinA [n = 2103], TRIMARAN/ TRIGGER [n = 1155 and 1437, respectively], IRIDIUM [n = 3092], ARGON [n = 1426], and CAPTAIN [n = 2439]) showed that adding LAMA increased lung function, decreased exacerbations, and, in some cases, ameliorated asthma control [29]. Nevertheless, these results have not been confirmed in clinical practice in a large population of patients. Consequently, the aim of this study is to analyze the clinical outcomes, use of healthcare resources, and the costs associated with the addition of LAMA to the LABA/ICS therapy in a wide cohort of patients with asthma (n = 4740 patients) in clinical practices in Spain.

2. Results

2.1. Study Population

Out of the 46,663 patients with asthma ≥18 years recorded in the database, 5072 patients (10.8%) were being treated with the TT. According to the inclusion/exclusion criteria, a population of 4740 patients was finally considered in the study (Figure 1).

Figure 1. Study scheme.

The study population had a mean age of 64.1 years (SD: 16.3), and 63.8% were women. The average time from asthma diagnosis was 32.4 years (SD: 15.8). Patients had an average of 2.9 medical conditions (SD: 2.0), the most frequent being arterial hypertension (52.3%), dyslipidemia (41.9%) and obesity (24.0%). Other prevalent comorbidities were allergic rhinitis (40.2%) and atopic dermatitis (28.2%). The average Charlson index score was 0.8 (SD: 1.4) .

2.2. Treatments

Before the index date, patients were being treated with a DT, mainly a combination of fluticasone/salmeterol (32.5%), beclomethasone/formoterol (32.0%) or budesonide/formoterol (24.2%). When patients initiated the TT, most kept their DT but there was a slight increase in the use of beclomethasone/formoterol (2.7%) and decreases in the use of fluticasone/salmeterol (3.3%) and budesonide/formoterol (1.2%). The most common LAMA added to the DT was tiotropium (64.0%), followed by glycopyrronium (15.3%) and aclidinium (14.0%) . The two last LAMAs were off-label at the time of the study.

Regarding the concomitant treatment, most patients combined the DT with SABA (92.5%), oral corticosteroids (32.4%) and leukotriene receptor antagonists (LRA) (27.7%). When they started the TT, there was a decrease in the use of concomitant medications (p ≤ 0.005), except for xanthines. The highest reductions were 12.4% (SABA), 6.3% (systemic antibiotics) and 4.7% (oral corticosteroids) .

The median duration of the treatment was 365 days, and the treatment persistence was 56.2% (95% CI: 54.8–57.6%) at 12 months of follow-up .

2.3. Clinical Outcomes and Deaths

2.4. Use of Healthcare Resources and Costs

The most-required healthcare resources in asthma patients treated with DT were primary care visits and hospitalizations. In general, the TT decreased the use of healthcare resources, particularly the number of patients admitted to hospitals (2.1%; 95% CI: 1.3–3.9%; p < 0.001) and the length of hospital stays (1.1 days; 95% CI: 0.7–1.5; p < 0.001). The TT also reduced the number of patients on sick leave and the number of sick leave days, although these differences were not statistically significant (p = 0.728 and p = 0.129, respectively) .

Healthcare costs were the highest proportion of total costs associated with the management of the study population. The addition of LAMA decreased healthcare costs by €539 (p < 0.001). Total costs amounted to €4719 for patients on DT and €4148 when they were receiving the TT. As a result, the TT implied cost savings of €571 in the management of asthma patients .

Cost savings were similar in patients with, or without, a COPD diagnosis. However, these varied from €397 (≥75 years) to €717 (18–44 years; p < 0.001 for all comparisons), per age group. In addition, higher reductions in management costs were seen in patients with FEV1 at the index date < 60% (€751), compared to patients with FEV1 at the index date ≥ 60% (€430; p < 0.001 for both comparisons) .

3. Discussion

The main result of the present study was that the TT reduced the incidence of severe exacerbations by 16.7% (p < 0.044) in patients with asthma, and the number of patients who suffered these events decreased by 8.5% (p < 0.001). In addition, the MITT registered a higher decrease in severe exacerbations in patients with more severe asthma (FEV1 at index date < 60%: 12.7%; p < 0.001) compared to those with milder symptoms (8.9%; p < 0.001). Therefore, our results confirmed those observed in the phase 3 studies (TRIMARAN and TRIGGER) [20,21], which demonstrated that the TT reduced the rate of severe exacerbations by 23.0% in comparison to the DT (p = 0.0076) [20]. In addition, considering that this is a retrospective database study, which is much less restrictive with regard to patient populations compared to the classical Phase 3 trials, better clinical outcomes were registered in patients with a worse health status, such as those with persistent airflow limitations (33.5%; p < 0.001) [21].

Previous studies also analyzed the effectiveness of LAMA in combination with LABA/ICS for patients with asthma in other countries [27,28,30,31]. Price et al. carried out an observational study in the UK to determine if the addition of LAMA (tiotropium) improved asthma control in routine clinical practice. They included 2042 patients in the study; 67% of these were being treated with ICS/LABA. Their results showed that tiotropium as an add-on therapy decreased the exacerbation rate (relative difference: 27.7%; p < 0.001), and prescriptions of oral corticosteroids (absolute difference: 10.3%; p < 0.001) and antibiotics (absolute difference: 9.9%; p < 0.001) [30]. In comparison to our results, 64% of patients were being treated with tiotropium, and we concluded that the TT reduced the exacerbation rate and the use of concomitant medications such as oral corticosteroids (4.7%; p < 0.001) and systemic antibiotics (6.3%; p < 0.001). Our results also showed an improvement in lung function (FEV1 [p < 0.001], FVC [p < 0.001], and FEV1/FVC values [p < 0.004]); however, Price et al. did not find differences in the FEV1 values (p = 0.935) and FEV1/FVC ratio (p = 0.382), possibly due to the sample size [30].

Asthma implies a high economic burden for the Spanish National Health System and society [12,13,14]. Sicras-Mainar et al. estimated that the management costs of patients with severe asthma amounted to an average of €5493/patient, and that the costs were higher for patients with eosinophilia (€6403/patient; p < 0.007) [12]. Another observational study carried out by Melero et al. showed that the annual mean cost of severe asthma was €8554/patient [13]. Our results indicated that the management of patients with asthma treated with DT implied a cost of €4719/patient, but the addition of LAMA resulted in cost savings of €571, which could be even higher in patients with more severe asthma (FEV1 < 60%) upon initiation of the treatment (€751/patient).

To our knowledge, this is the first study to analyze the effectiveness of LAMA as an add-on therapy to ICS/LABA in Spain. This suggests that the next steps should be the use of specific tests to measure whether the observed improvements in asthmatic patients’ clinical outcomes are accompanied by an ameliorated HRQoL in asthmatic patients. There is a wide range of tests to measure treatment impact on patients’ asthma or rhinology control, lung function or HRQoL (asthma control test [ACT], asthma control questionnaire [ACQ], asthma quality of life questionnaire [AQLQ], 22-item sinonasal outcome test [SNOT-22], etc.) [32,33,34]. In addition, a sub-analysis on populations with asthma and specific comorbidities, such as CRS or allergies, could be informative [35]. Patient outcomes could also be determined by the genetic mutations or epigenetic modifications that patients bear and that are involved in asthma mechanisms, predispositions, or even in their relationship to other disorders [35,36,37,38]. The main limitation of this before-and-after study is the lack of a control group towards which we could directly compare results at the time of obtaining the data. Our study was based on registries of a wide population of patients with asthma and described clinical practices in our country, including all LAMA currently prescribed. We considered the same cohort of patients who received both the dual and TT therapies, so they constituted their own control with which to compare the clinical outcomes in both therapies, but the time difference and the individual characteristics of each patient, which may have influenced their development, should be acknowledged. Additionally, our study has the limitations of retrospective and observational studies, such as under-recording of the disorders or clinical outcomes in the database, and variations in physicians’ clinical practices, methods of measurement, and classification/selection biases. Other limitations include the inaccuracy of the disease coding system and the lack of some variables that could influence the results, such as the socioeconomic status of patients.

4. Materials and Methods

This is an observational and retrospective study, based on electronic medical records (EMR) from the BIG-PAC® database. The primary data were obtained from the computerized medical records of primary care centers and hospitals (publicly owned services), from integrated health areas in seven Spanish autonomous communities (around 1.8 million patients) [39,40]. These data are anonymized in the source centers in compliance with data protection regulations prior to inclusion in the BIG-PAC® database. Internal studies have shown that information gathered in the BIG-PAC® database is representative of the Spanish population [41].

4.1. Study Population and Design

This before-and-after study considered patients with asthma, according to the International Classification of Diseases (9th edition)—Clinical Modification (ICD-9-CM: 493.x), who started a treatment with LABA/ICS + LAMA in a MITT between 1 January 2017 and 31 December 2018 (recruitment period), and who had been previously treated with a single inhaler containing a DT LABA/ICS in the year prior to the index date. We used a before-and-after study design to follow the same individuals, who had uncontrolled asthma, and measure their response after adding LAMA. It should be noted that ICD-9-CM codes 493.x discriminates asthma from other respiratory diseases. The index date was the date when LAMA was added to the treatment. Data of the clinical variables were collected during the year before, and after, the corresponding index date.

The inclusion criteria were (a) age ≥ 18 years, (b) diagnosis of asthma, (c) being on treatment with LABA/ICS + LAMA (two inhalers) and previous treatment with LABA/ICS (single inhaler), (d) being active in the database for ≥12 months before study initiation, (e) inclusion in the chronic prescription program (with ≥2 prescriptions during the follow-up period) and (f) patients regularly monitored (≥2 records in the database).

The exclusion criteria were: (a) patients on treatment with LABA/ICS + LAMA (one or three inhalers), (b) patients transferred to other centers, displaced or out-of-area, and (c) residents of nursing homes.

4.2. Demographic Variables, Comorbidities, and Treatments

Demographic variables (age, gender) and comorbidities (arterial hypertension, dyslipidemia, obesity, diabetes, renal failure, depressive syndrome, heart failure, ischemic heart disease, COPD, peripheral arterial disease, stroke, malignant neoplasms, allergic rhinitis, atopic dermatitis, chronic rhinosinusitis with nasal polyposis, aspirin-exacerbated respiratory disease) were collected. The Charlson comorbidity index was used as a summary variable of comorbidities, as it estimates the mortality risk in connection with comorbidities [42]. Median (P25–P75) time from diagnosis, median BMI, and the status of active smoking were taken.

Treatments (prescribed according to clinical practice) were collected from drug-dispensing records. Drugs were coded using the Anatomical Therapeutic Chemical Classification System (ATC) [43]. Maintenance treatment (ICS/LABA and LAMA [beclomethasone/formoterol, budesonide/formoterol, fluticasone/formoterol, fluticasone/vilanterol, fluticasone/salmeterol, tiotropium, aclidinium, glycopyrronium, umeclidinium] and concomitant medication (oral corticosteroids, chronic use of oral corticosteroids (>6 months), systemic antibiotics, short-acting beta agonists (SABA), short-acting muscarinic antagonists (SAMA), xanthines, LRA, and biologic drugs were considered.

Treatment persistence/duration was estimated from the index date up to 12 months, or up to the switch to another treatment other than that which motivated inclusion (in the succeeding 30 days), or interruption/discontinuation of medication (≥60 days without renewing the medication) or death, whichever occurred first. Treatment persistence was assessed at 6 and 12 months after the index date.

4.3. Clinical Outcomes and Deaths

Severe exacerbations were defined as a worsening of asthma requiring treatment with systemic corticosteroids (intravenous or oral) for at least three days (with an associated visit to an emergency department or other level of care, or a documented hospital admission). Therefore, two subgroups of severe exacerbations were defined: those who required treatment with systemic corticosteroids and those involving hospitalization [44]. The number and percentage of patients with severe exacerbations, mean (SD) severe exacerbations and the number and percentage of patients with 0, 1 or ≥2 severe exacerbations were provided for these two groups and for the overall population with severe exacerbations.

The time from the index date up to the first severe exacerbation was also collected.

Lung function was estimated using the forced expiratory volume in first, second (FEV1, mean, [SD] and median [P25–P75]), forced vital capacity (FVC, mean, [SD] and median [P25–P75]) and FEV1/FVC (mean, [SD] and median [P25–P75]). Eosinophil counts in cells/μL (mean [SD] and median [P25–P75]) in blood were also measured. The number and percentage of patients with ≥300 cells/μL were also provided.

Deaths were recorded and the time from the index date until the patient’s death was estimated.

4.4. Resource Use and Costs

Healthcare and non-healthcare resource use and costs were estimated during the follow-up period. Healthcare resources included medical visits (primary care, specialists [cardiology, internal medicine, endocrinology, vascular, neurology, hematology, geriatrics], and emergency room), hospitalizations (percentage of hospitalized patients and hospitalization days), diagnostic/therapeutic tests (conventional laboratory tests, radiology, computed tomography, magnetic nuclear resonance and other diagnostic/therapeutic tests [catheterization, angioplasty, endarterectomy/thrombectomy] Non-healthcare resources comprised the number on patients on sick leave and the days of work lost.

Cost were expressed in 2019 Euros [12]. Unit costs can be seen in . Drug costs (maintenance treatment [ICS/LABA, LAMA] and concomitant medication including oral corticoids, antibiotics, SABA, SAMA, xanthines, leukotrienes, biologic drugs, and home oxygen therapy, were estimated using the retail price per pack at the time of prescription [45]. The number of days of work disability and the mean salary of the Spanish population were considered to estimate productivity losses (non-healthcare costs) [46].

4.5. Statistical Analyses

Descriptive univariate statistical analyses were carried out. The baseline characteristics of patients were summarized using descriptive statistics. For continuous variables, the number of patients, means and standard deviations, were reported. Frequency distributions with quantities and percentages were reported for categorical variables using absolute and relative frequencies (N, %). On the other hand, quantitative data were described using means and standard deviations (SD) in symmetrical distributions and medians and interquartile ranges (IQR, P25–P75; Q1–Q3) for asymmetrical distributions. The 95% confidence intervals (CI) were calculated to estimate population parameters.

For the bivariate comparative analysis (before–after study for related groups), the techniques of statistical significance for paired groups were used. McNemar’s tests and Student’s t-tests were conducted to compare treatments, severe exacerbation rates, use of healthcare resources, and costs between the study cohorts (before and after the addition of LAMA to the LABA/ICS therapy). A generalized linear model (GLM) repeated measures procedure was also carried out to compare dependent variables (intra-subject), such as the severe exacerbation rates and the use of SABA and oral corticosteroids, before, and after, the addition of LAMA to the LABA/ICS therapy. A complete factorial model (polynomial contrasts) was developed and the criteria to apply it was the Mauchly’s sphericity test with orthonormalized data transformation. In addition, the impact of the covariates’ inter-subjects (age, Charlson index, differences in costs before and after LAMA treatment and the diagnosis of COPD) in severe exacerbation rates were analyzed.

Subgroup analyses were developed to estimate the changes in FEV1, severe exacerbation rates and costs, per age group (18–44 years, 45–64 years, 65–74 years or ≥75 years), asthma severity (patients with FEV1 at the index date <60% or ≥60%) and having an additional diagnosis of chronic obstructive pulmonary disease (COPD).

The treatment persistence/duration was analyzed using a Kaplan–Meier survival analysis (procedure: log-rank test). Data were censored in the absence of the event.

The SPSSWIN version 25 statistical program was used. Statistical significance was set at p < 0.05.

4.6. Compliance with Ethics

This study was carried out in line with the Helsinki Declaration. Patient consent was not obtained since Spanish legislation excludes existing data that are aggregated for analysis. Personal data were de-identified as specified in the Spanish Law 15/1999, of 13 December, on Personal Data Protection, and the Organic Law 3/2018, of 5 December, On the Protection of Personal Data and Guarantee of Digital Rights [47,48]. The study was approved by the Research Ethics Committee of the Hospital de Terrassa, Barcelona, Spain.

5. Conclusions

In conclusion, our results showed that the addition of LAMA to the ICS/LABA therapy improved the clinical outcomes of patients with asthma, including lung function and severe exacerbation rates, particularly in younger patients and those with more severe asthma. These improvements led to a decrease in the use of concomitant medications and other healthcare resources, along with cost savings for the Spanish National Health System and society.

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Poly I:C Pre-Treatment Induced the Anti-Viral Interferon Response in Airway Epithelial Cells
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Type I and III interferons are among the most important antiviral mediators. Increased susceptibility to infections has been described as being associated with impaired interferon response in asthmatic patients. In this work, we focused on the modulation of interferon dysfunction after the rhinovirus infection of airway epithelial cells. Therefore, we tested polyinosinic:polycytidylic acid (poly I:C), a TLR3 agonist, as a possible preventive pre-treatment to improve this anti-viral response. In our human study on asthma, we found a deficiency in interferon levels in the nasal epithelial cells (NEC) from asthmatics at homeostatic level and after RV infection, which might contribute to frequent airway infection seen in asthmatic patients compared to healthy controls. Finally, pre-treatment with the immunomodulatory substance poly I:C before RV infection restored IFN responses in airway epithelial cells. Altogether, we consider poly I:C pre-treatment as a promising strategy for the induction of interferon response prior to viral infections. These results might help to improve current therapeutic strategies for allergic asthma exacerbations.
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The current study aimed to investigate the association between asthma and periodontitis in the Korean adult population. Data from the Korean Genome and Epidemiology Study Health Examinees between 2004 and 2016 were considered. Of the 173,209 participants, 2521 asthmatic and 132,806 control participants were selected. The participants were categorized according to their current status of asthma, as ‘well-controlled’, ‘being treated’, and ‘not being treated’. The prevalence of periodontitis was found to be significantly higher in the participants with asthma (13.1%) than in the controls (7.3%). In the fully adjusted model, the patients with asthma had a higher odds ratio (OR = 1.79, 95% confidence interval [CI] = 1.59–2.02, p < 0.001) for periodontitis than those without asthma. The results were consistent across all the age and sex subgroups. The adjusted ORs for periodontitis were 2.15 (95% CI = 1.68–2.76, p < 0.001) in the ‘well-controlled’ asthma group, 1.44 (95% CI = 1.16–1.78, p < 0.001) in the ‘being treated’ asthma group, and 1.86 (95% CI = 1.55–2.22, p < 0.001) in the ’not being treated’ asthma group compared to the control group. Overall, we found asthma to be associated with periodontitis in Korean adults, and the participants with well-controlled asthma had the highest ORs for periodontitis.
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Background: Research on the longer-term sequelae of COVID-19 in patients with asthma is limited. Objective: To assess the frequency and severity of long-term symptoms of COVID-19 in the population of asthma patients. Methods: A systematic review of the published literature was conducted in accordance with the recommendations of the PRISMA statement. EMBASE, MEDLINE/PubMed, Web of Science, CINAHL, and Scopus Scholar were searched for terms related to asthma and post or long COVID-19, and for systematic reviews related to specific questions within our review, up to June 2022. Results: Data from 9 references publications included in the review were extracted. A total of 1466 adult asthmatic patients with COVID-19 infection were described in all the publications mentioned above. Of the long-term symptoms reported after COVID-19, patients indicated: lower respiratory symptoms, fatigue, cognitive symptoms, psychological problems, and other such as skin rashes, gastrointestinal disorders, tachycardia, palpitations, ocular disorders, ageusia/hypogeusia, anosmia/hyposmia, and poor sleep quality. These symptoms in similar intensity were observed in the comparison groups without a diagnosis of asthma. Conclusions: The published data neither confirm nor deny that long-term COVID-19 symptoms in patients with asthma diagnosis are different in strength and frequency from patients without asthma diagnosis. To indicate associations between asthma and COVID-19 infection and severity, as well as the frequency of long-term symptoms of COVID-19, more longitudinal research is needed in chronic asthma patients with different phenotypes, intensity of treatment, and degree of asthma control.
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