Asthma management in a public referral center in Porto Alegre in comparison with the guidelines established in the III Brazilian Consensus on Asthma Management

Abstracts

OBJETIVO: Avaliar se as diretrizes do III Consenso Brasileiro no Manejo da Asma estão sendo aplicadas em uma população de asmáticos em um hospital de referência da rede pública de Porto Alegre (RS). MÉTODOS: Todos os pacientes adultos que iniciaram tratamento entre 1999 e 2002 foram avaliados. O tratamento recebido foi classificado em concordante ou discordante do Consenso. As características clínicas da asma e a freqüência do tratamento por especialista foram comparadas entre os grupos. RESULTADOS: Foram avaliados os prontuários de 357 pacientes, com média de idade de 41 anos, sendo 106 homens (29,7%) e 251 mulheres (70,3%), 33 tabagistas (9,2%). O tratamento foi considerado discordante em 246 pacientes (70%), sendo que, neste grupo, houve ausência de tratamento com corticóide inalatório em pacientes com asma persistente em 174 deles (71%). Volume expiratório forçado no primeiro segundo normal, idade entre doze e dezoito anos e asma intermitente foram observados com maior freqüência entre os pacientes com tratamento concordante (p < 0,01). Tratamento discordante não teve correlação com tratamento por pneumologista, gravidade da asma persistente ou número de visitas à emergência. CONCLUSÃO: A maioria dos pacientes com asma tratados em uma unidade de referência da rede pública em Porto Alegre não faz o tratamento preconizado pelos consensos e o subtratamento com corticóide inalatório é a principal causa de discordância.

Asma; Consenso; Estudo comparativo

ORIGINAL ARTICLE

Asthma management in a public referral center in Porto Alegre in comparison with the guidelines established in the III Brazilian Consensus on Asthma Management^*

Waldo Mattos^I; Luciano Bauer Grohs^II; Fabíola Roque^III; Maurício Ferreira^III; Gabriela Mânica^III; Ernesto Soares^III

^IAdjunct Professor in the Internal Medicine Department of the Fundação Faculdade Federal de Ciências Médicas de Porto Alegre (FFFCMPA, Federal Foundation School of Medical Sciences of Porto Alegre); Chief Resident in Internal Medicine at the Hospital Nossa Senhora da Conceição - Porto Alegre, Rio Grande do Sul, Brazil

^IIMedical resident in Pulmonology at the Hospital Nossa Senhora da Conceição - Porto Alegre, Rio Grande do Sul, Brazil

^IIIMedical student at the Fundação Faculdade Federal de Ciências Médicas de Porto Alegre (FFFCMPA, Federal Foundation School of Medical Sciences of Porto Alegre) - Porto Alegre, Rio Grande do Sul, Brazil

^{Correspondence to}

ABSTRACT

OBJECTIVE: To determine whether the guidelines put forth in the III Brazilian Consensus on Asthma Management are being applied in a population of asthma patients treated at a public hospital that is a referral center for asthma in the city of Porto Alegre, Brazil.

METHODS: All adult asthma patients who began their treatment between 1999 and 2002 were evaluated. The treatment given was classified as consistent or inconsistent with the Consensus guidelines. The clinical features of asthma and the frequency of treatment provided by a specialist were compared between the two groups (those receiving guideline-consistent treatment and those receiving guideline-inconsistent treatment).

RESULTS: The charts of 357 patients were evaluated. The study sample consisted of 106 males (29.9%) and 251 females (70.3%). The mean age was 41 years, and 33 (9.2%) of the patients were smokers. The treatment was considered inconsistent with the Consensus guidelines in 246 cases (70%). Of those 246, 174 (71%) had presented persistent asthma and were not treated with an inhaled corticosteroid. Normal forced expiratory volume in one second, being from 12 to 18 years of age, and having intermittent asthma were more frequently observed among the patients receiving guideline-consistent treatment (p < 0.01). No correlations were found between guideline-inconsistent treatment and being treated by a pulmonologist, severity of persistent asthma or number of emergency room visits.

CONCLUSION: Most of the asthma patients treated at the public referral center in Porto Alegre did not receive treatment that was consistent with the Consensus guidelines. Undertreatment with inhaled corticosteroids was the principal source of that inconsistency.

Keywords: Asthma/therapy; Guidelines; Comparative study

INTRODUCTION

It is estimated that there are approximately ten million individuals with asthma in Brazil. Its negative impact on the population includes the economic costs of the health system structures and the use of medications, as well as the harmful effects on various aspects of patient health, from compromised quality of life to death. In 2001, the Hospital Information Service of the Ministry of Health registered 365,966 hospitalizations and 2454 deaths from asthma, at a cost of R$107,123,187.75 (in Brazilian reals), considering only the transfer of the value stipulated for authorizations for hospital admission.⁽¹⁾ These data symbolize the concept that this disease is a true public health problem.

Many factors have been identified as possible causes of asthma morbidity and mortality: patient lack of understanding of the disease; inadequate medical prescriptions; low compliance with treatment; inability to use inhalation; absence of a written plan to face exacerbations; and limited use of functional evaluation in the diagnosis and staging of asthma severity.^(2-13)

In the attempt to improve asthma control, consensus guidelines including all of the relevant scientific information published have been systematically drawn up in various countries in order to aid health professionals in carrying out the treatment of these patients. However, the use of these guidelines by health professionals, in rich as well as in poor countries, have proven quite insufficient.^(14-17) This inadequacy has been reported to occur in the treatment of the exacerbation as well as in the period between asthma attacks. In one study,⁽¹⁸⁾ it was demonstrated that 62% of asthma patients treated in the emergency room were undertreated, 87% had no written plan of action for emergency situations, and 73% did not know how to measure peak expiratory flow (PEF). Similarly, other authors have reported that only 54% of the patients with severe asthma used an inhaled corticosteroid as part of their daily outpatient treatment.

One component of this problem that remains relevant is the lack of knowledge on the part of health professionals. In the USA, medical knowledge regarding the content provided by the National Heart Lung and Blood Institute was assessed through the use of a questionnaire, and the mean total proportion of correct responses, among specialists and non-specialists, was found to be only 60%.⁽¹⁷⁾ Some authors have reported that the training of resident physicians improves aspects of asthma treatment but not of its diagnosis.⁽¹⁹⁾

In Brazil, three consensus guidelines on asthma management have been established, the most recent one in 2002. However, it remains unclear how much these documents have helped to change the panorama of asthma control in the country. The objective of the present study was to determine whether the guidelines put forth in the III Brazilian Consensus on Asthma Management are being applied, in clinical practice, in a population of patients served by the public health system in the city of Porto Alegre, Brazil.⁽²⁰⁾

METHODS

We evaluated, retrospectively, the information collected during the first medical appointment and contained in the charts of patients referred to the Asthma Clinic of the Pulmonology Department of the Nossa Senhora da Conceição Hospital (a teaching hospital with ties to the Ministry of Health) between 1999 and 2002. All of the charts evaluated were for patients who had been diagnosed with asthma in the first medical appointment or during the follow-up treatment.

The diagnostic criteria were as follows: presenting symptoms (dyspnea, chronic cough, or wheezing); having obstructive ventilatory disorder, which was defined as forced expiratory volume in one second (FEV₁) < 80% of predicted and ratio between FEV₁ and forced vital capacity < 0.7. Patients meeting these criteria in the initial evaluation or during the follow-up treatment were classified as asthma sufferers. Patients presenting chronic obstructive pulmonary disease, bronchiectasis, tuberculosis sequelae, or any other chronic pulmonary disease were excluded. The medications that the patients themselves reported taking in the final evaluation were considered to constitute the treatment regimen at the moment of the first medical appointment, and this treatment regimen was compared with that recommended in the guidelines established in the III Brazilian Consensus on Asthma Management. Patients having had no medical appointments within the last twelve months were not considered to be in follow-up treatment.

The data reviewed were as follows: gender; age; history of smoking; symptoms; spirometry or PEF results; medication used; specialization of the physician who treated the patient previously; and number of emergency room visits within the twelve months prior to and after the medical appointment. The clinical form filled out in the first evaluation is standardized, and all the information regarding the variables mentioned above was thereby registered at the moment of the interview, except for the number of emergency room visits, which was obtained prospectively through the computerized system of registration of medical appointments. The system records the date and location (for example, emergency room) of all visits but does not include the reason for the medical appointment.

All patients were submitted to blood workups. In addition, total IgE serum levels were determined, PEF was measured, spirometry (including a pharmacodynamic test) was performed, and X-rays (of the chest and sinuses) were taken. Asthma was classified as intermittent or persistent and was categorized as mild, moderate, or severe according to the guidelines established in the III Brazilian Consensus on Asthma Management,⁽²⁰⁾ which are based on the symptoms, the impact on patient activities, the intensity of exacerbations, the presence of nocturnal symptoms, the use of relief medication, the PEF, and the FEV₁.

The treatment was then classified as consistent or inconsistent with the guidelines established in the III Brazilian Consensus on Asthma Management⁽²⁰⁾: intermittent asthma - use of a short-acting b2 agonist alone; mild persistent asthma - use of low doses of an inhaled corticosteroid (400 g/day of beclomethasone or equivalent) or antileukotriene; moderate persistent asthma - use of low or moderate doses of an inhaled corticosteroid (ranging from 400 to 800 g/day of beclomethasone or equivalent), in combination with a long-acting b2 agonist or high doses of an inhaled corticosteroid (> 800 g/day of beclomethasone or equivalent); severe persistent asthma - use of high doses of an inhaled corticosteroid, a long-acting b2 agonist, an oral corticosteroid, theophylline, or antileukotriene drugs.

The data were organized using Microsoft Excel, version 2000, and were analyzed using the SPSS program, version 10.2. The analysis of variance F-test or the Student's t-test was used in the analysis of quantitative variables, whereas the chi-square test was used to analyze categorical variables. The study of some quantitative variables was complemented by a correlation analysis using the Spearman correlation coefficient. A 95% confidence interval was adopted, and values of p < 0.05 were considered statistically significant.

RESULTS

The medical charts of 357 patients, of which 106 (29.7%) were male and 251 (70.3%) were female, were analyzed (Table 1). Ages ranged from 11 to 80 years (mean, 41 ± 18 years). Of those 357 patients, 287 (80.4%) were Caucasian, and 70 (19.6%) were non-white. In addition, 33 (9.2%) were smokers, and 97 (27.2%) were former smokers. A total of 4 patients were excluded from the analysis due to lack of information in their charts.

In the initial medical appointment, the treatment reported was consistent with what is recommended in the Brazilian Consensus guidelines according to asthma severity in 107 patients (30%) and inconsistent in the remaining 246 (70%). Treatments were considered guideline-consistent in 55/71 cases of intermittent asthma (78%), 22/106 cases of mild persistent asthma (20%), 12/113 cases of moderate persistent asthma (11%), and 31/63 cases of severe persistent asthma (49%). The percentage of patients with intermittent asthma receiving guideline-consistent treatment was greater than that observed among patients with persistent asthma (p < 0.0001).

There were no statistically significant differences among the degrees of persistent asthma (Figure 1). However, we detected a tendency toward a smaller number of guideline-inconsistent treatments among the cases of severe persistent asthma.

Of the 246 patients receiving guideline-inconsistent treatment, 174 (71%) were patients with persistent asthma who were treated with a corticosteroid, 43 (17%) were patients for whom the use of an oral corticosteroid was not considered necessary, 17 (7%) were patients with intermittent asthma who were under treatment with a corticosteroid, and 12 (5%) were patients with persistent asthma treated with doses of an inhaled corticosteroid that were lower than those recommended.

The frequency of guideline-consistent treatments was found to be the highest among the youngest patients (those between 12 and 18 years of age) and among those presenting normal FEV₁ in the initial spirometric test (p < 0.01). The treatments received by the patients at the moment of the initial evaluation are described in Table 2. In addition, we observed a higher prevalence of intermittent asthma and mild persistent asthma among the young patients (p = 0.01). Figure 2 shows the age distribution in the groups of patients receiving guideline-consistent and guideline-inconsistent treatment.

There was a slight tendency, with no statistical significance, toward a greater number of guideline-inconsistent treatments among the patients previously treated by non-pulmonologists (Figure 3). The treatment was considered guideline-inconsistent in 21/31 cases being treated by pulmonologists (68%), in 105/140 cases being treated by any other physicians other than pulmonologists (75%), and in 93/122 cases of patients not in follow-treatment (76%). In 64 cases, it was not possible to categorize the treatment based on the information contained in the medical charts.

The number of emergency room visits within the last twelve months prior to the medical appointment was similar among the patients treated by pulmonologists and those treated by non-pulmonologists (2.84 + 2.05 vs. 2.96 + 3.53 visits, respectively). There were no statistically significant differences between the twelve months preceding the initial evaluation and the twelve subsequent months in terms of the total number of emergency room visits (2.97 + 4.12 vs. 2.56 + 5.87). In addition, we observed a positive correlation between the pre-evaluation and post-evaluation periods in patients who had visited the emergency room at least once in both periods (r = 0.65, p < 0.0001). The number of emergency room visits was not found to correlate with asthma severity at the time of the initial evaluation or with underutilization of inhaled corticosteroids.

DISCUSSION

In the present study, it was demonstrated that most of the public heath care system asthma patients who were first treated at the referral center in Porto Alegre did not receive treatment consistent with the Consensus guidelines, and that underutilization of inhaled corticosteroids was the greatest problem. In the subgroup of patients with intermittent asthma, for whom the use of inhaled corticosteroids is not recommended in the Consensus guidelines, the treatment was most often in keeping with the guidelines.

These findings must be interpreted with caution, and many causal factors must be considered. First, compliance with treatment among patients with persistent asthma does not differ from that seen among patients with other chronic diseases. Even in developed countries, where the access to the health system and medications is effectively possible, various reports in the literature indicate a rate of compliance of approximately 50%.^(13,21-22) In the present study, compliance with treatment was not evaluated, since we considered the treatment reported by the patient, and this does not necessarily imply that it was the treatment prescribed. It is possible that our results reflect a combination of these factors.

Second, we know that the lack of knowledge regarding the disease, principles of treatment, and procedures of use of inhaled medications is also considered another important determinant of treatment inconsistency. In fact, the inclusion of patients in asthma education programs, whose activities are based on information, promotes better asthma control by increasing compliance with the treatment regimens prescribed. Although there have been no Brazilian studies confirming the results obtained in North-American studies,⁽¹⁷⁾ the lack of knowledge on the part of physicians has also been considered a factor that contributes to treatment inconsistency.

We could presume that, since most of the patients analyzed in the present study were being treated by a general practitioner and had had no access to a formal education program about their disease, part of the problem might be the lack of awareness on the part of both the practitioner and the patient. However, we observed only a tendency, without statistical significance, toward higher frequency of guideline-consistent treatment among the patients previously treated by pulmonologists. The interpretation of this finding that the treatment provided by specialists, who are necessarily more up-to-date with the treatment principles than are non-specialists, did not result in a statistically significant difference is somewhat intriguing. A deeper understanding may depend on accepting the fact that an approach that does not guarantee unlimited access to the medication used to control the disease and prevent exacerbations, as well as potentially reducing the cost and the use of the public health care system infrastructure, as has been adopted by a number of health administrators, is the greatest of all failures. Therefore, it is possible that the limited availability of appropriate medications negates any advantage related to the better knowledge possessed by the specialist, resulting in no effective gain in the quality of the treatment.

In the present study, we also observed that the number of emergency room visits was not proportionally related to asthma severity or underutilization of corticosteroids, and that the patients who most frequently sought treatment in the emergency room prior to the asthma clinic evaluation continued to seek treatment in the emergency room after that specialized treatment. This may be a reflection of the problems inherent to our public health care system, in its current state, which is characterized by limited access (to physicians and to medication). We observed that there were a significant number of patients being treated unnecessarily with systemic corticosteroids, possibly only due to the fact that this medication is available in public health facilities, in contrast to inhaled corticosteroids, which are not readily available in health care services. These problems, taken together, probably explain why updating and disseminating the Consensus guidelines have lower effectiveness than expected.

The holding of regular consensus meetings and the regular publishing of consensus guidelines in national journals reinforce and expand the potential for dissemination of medical information. This has been done from the viewpoint that even the specialist can benefit from reviewing this information. However, we must bear in mind that most asthma patients are treated by non-specialists, and that, while the availability of drugs that control this disease remains restricted and access to outpatient treatment remains limited, no attenuation of this public health problem can be expected. Therefore, strategies to disseminate guidelines to the general practitioner may be more important.

ACKNOWLEDGEMENTS

The authors would like to thank Professor Viviane Mattos for designing the statistical evaluation.

REFERENCES

Submitted: 16 January 2005. Accepted, after review: 29 November 2005

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*

Study carried out at the Fundação Faculdade Federal de Ciências Médicas de Porto Alegre (FFFCMPA, Federal Foundation School of Medical Sciences of Porto Alegre) - Porto Alegre, Rio Grande do Sul, Brazil.

Publication Dates

• Publication in this collection
  15 Mar 2007
• Date of issue
  Oct 2006

History

• Received
  16 Jan 2005
• Accepted
  29 Nov 2005