ABSTRACT

To assess the impact that educational interventions to improve inhaler techniques have on the clinical and functional control of asthma and COPD, we evaluated 44 participants before and after such an intervention. There was a significant decrease in the number of errors, and 20 patients (46%) significantly improved their technique regarding prior exhalation and breath hold. In the asthma group, there were significant improvements in the mean FEV1, FVC, and PEF (of 6.4%, 8.6%, and 8.3% respectively). Those improvements were accompanied by improvements in Control of Allergic Rhinitis and Asthma Test scores but not in Asthma Control Test scores. In the COPD group, there were no significant variations. In asthma patients, educational interventions appear to improve inhaler technique, clinical control, and functional control.

Keywords: Asthma, Pulmonary disease, chronic obstructive; Nebulizers and vaporizers.

RESUMO

Para avaliar o impacto do ensino da técnica inalatória no controle clínico e funcional de pacientes com asma ou DPOC, incluíram-se 44 participantes antes e após essa intervenção. Houve uma diminuição significativa no número de erros cometidos, sendo que 20 pacientes (46%) melhoraram significativamente sua técnica na expiração prévia e apneia final. No grupo asma, houve significativa melhora nas médias de FEV1 (6,4%), CVF (8,6%) e PFE (8,3%), e essa melhora correlacionou-se com os resultados no Control of Allergic Rhinitis and Asthma Test, mas não com os do Asthma Control Test. No grupo DPOC, não houve variações significativas. O ensino da técnica inalatória parece melhorar seu desempenho e os controles clínico e funcional em pacientes com asma.

Palavras-chave: Asma; Doença pulmonar obstrutiva crônica; Nebulizadores e vaporizadores.

Inhalation therapy is the most effective modality for the treatment of asthma and COPD. The various types of inhal-ers available on the market have different specifications and require different techniques, leading to a number of errors in performance, thus reducing treatment efficacy and adherence. Up to 76% of patients make some type of error in their inhaler technique.(1) Growing evidence suggests that educational interventions and reviews of the tech-nique have a positive impact on disease control.(2,3) This study was performed in the context of an interventional trial, with the aim of assessing the impact that an educational intervention to improve inhaler technique has on the clinical and functional control of asthma and COPD. Preliminary results containing the cross-sectional baseline analysis of the patients enrolled in the trial have previously been published.(4) The results suggest a significant relationship between the number of errors committed and the level of clinical and functional control achieved in asthma patients.

We included patients with asthma or COPD, all of whom were receiving treatment with at least one inhaler device. The patients were evaluated in two different visits, with a six- to eight-month interval between visits. After the first visit, the patients were taught how to use their devices correctly. The inhaler technique was evaluated only for the main treatment device, and the use of a device for symptom relief was therefore not evaluated. The variables under study were demographic data; clinical control-by means of the Asthma Control Test (ACT), Control of Allergic Rhini-tis and Asthma Test (CARAT), modified Medical Research Council (mMRC) scale, and COPD Assessment Test (CAT); functional control-absolute FEV1 (in percentage of the predicted value and in mL), PEF (in percentage of the predict-ed value and in mL), FVC (in mL and in percentage of the predicted value), FEV1/FVC ratio, FEF25-75%, and SpO2; and number of steps of the inhaler technique correctly performed (per definition, step 1: device actuation; step 2: exhala-tion; step 3: inhalation; and step 4: a 5-10 s breath hold). The data were compiled in Microsoft Office Excel 2010, and statistical analyses were performed with IBM SPSS Statistics software package, version 20.0 (IBM Corporation; Ar-monk, NY, USA). The level of significance was set at p < 0.05.

Of the initial 62 patients invited to participate in the study, 18 dropped out. Therefore, 44 patients were included in the follow-up re-evaluation (mean age, 59 ±16 years). Of the 44 patients in the sample, 21 (47.8%) were men, and 23 (52.2%) were women. Among the 44 patients, 23 (52.2%) and 21 (47.8%) were diagnosed with asthma and COPD, respectively. In the first visit, a small number of technical errors was significantly associated with previous teaching of inhaler technique (p < 0.05; Fisher's exact test) and with age (p < 0.05; R = 0.13; Pearson's correlation coefficient), although not with the number of years since diagnosis (Pearson's correlation coefficient). There was an association between a smaller number of errors and better clinical control in the asthma group, indicated by the ACT scores (maximum mean difference, 11.6 points) and CARAT scores (maximum mean difference, 12.3 points; p < 0.05; ANOVA). However, although a similar graphic pattern was found in the COPD group, the differences within that group were not statistically significant.

Figure 1 includes the main results obtained. At the second visit, there was a significant decrease in the number of errors after the educational session, with a mean decrease of 0.7 errors (range, 0.29-1.02; p < 0.05; t-test for paired samples). Among the 44 patients, 20 (46%) improved their inhaler technique, with significant results found in step 2 (relative improvement of 45.5%) and step 4 (relative improvement of 52%; t-test for paired samples for both). In the asthma group, there were post-intervention improvements in the functional parameters (in percentages of the pre-dicted values): the mean FEV1 increased from −10.26% to −2.52% (a relative improvement of 6.4%); the mean FVC increased from −12.99% to −4.14% (a relative improvement of 8.6%); and the mean PEF increased from −14.35% to −2.35% (a relative improvement of 8.3%). Comparing the pre- and post-intervention functional parameter values, we found the differences to be significant (p < 0.05 for all; t-test for paired samples). In addition, improved inhaler tech-nique was significantly correlated with an improvement in the CARAT score (OR = 14.4; p < 0.05; Fisher's exact test), although not in the ACT score. However, regarding the asthma group, if we defined a > 4 point increase in the CARAT score as a clinically significant improvement in control, we would find that only 5 participants (23.8%) met the criterion for such improvement. Using the same approach, if we established a > 3 point increase in the ACT score as a clinically significant improvement in control, we would find that only 8 participants (38.0%) met the criterion. In the COPD group, there were no significant variations in clinical or functional control variables. However, if we defined a > 1 point increase in the mMRC score as a clinically significant improvement in control, we would find that 6 patients (28.6%) met the criterion. If we defined a > 2 point increase in the CAT score as a clinically significant improvement in control, we would find that 5 participants (23.8%) met the criterion.
 




In a post-hoc analysis of the functional parameters, in absolute values (mL), we found a statistically significant im-provement in FEV1 in the COPD group (mean increase, 145.7 mL; 95% CI: 11.7-279.8; p = 0.035; t-test for paired samples). In the asthma group, there was improvement, although the difference was not statistically significant (mean increase, 105.9 mL; 95% CI: −47.6 to 259.4; p = 0.17; t-test for paired samples). For PEF (in mL), there were im-provements that were found to be statistically significant in the asthma group (mean increase, 460 mL; 95% CI: 30.9-890.0; p = 0.037; t-test for paired samples) but not in the COPD group (mean increase, 212.9 mL; 95% CI: −184.0 to 609.7; p = 0.276; t-test for paired samples).

These results show that most patients make errors in the inhaler technique, and that seems to be associated with age and previous training regarding the technique. Younger patients made fewer errors, which might be due to differ-ences in literacy levels. The small sample size might have reduced the statistical power of some findings, such as the association with the number of years since diagnosis. Our results also show that proper inhaler technique was asso-ciated with better clinical control in asthma patients, and improving the technique could also affect functional parame-ters, mainly those directly related to airway obstruction, such as FEV1, FVC, and PEF. When comparing CARAT with ACT scores, we found that the former was more sensitive in detecting such changes, possibly because CARAT is a more comprehensive clinical test.(5) In patients with COPD, no significant improvements were observed, either in clinical control or in functional parameters (in percentage of the predicted value), which, as previously mentioned, might be due to the small sample size, or even to the pathophysiological differences between the diseases. However, some of those patients showed clinically significant improvement after the educational intervention, which supports the hypothesis that larger samples and continuous training might be more accurate in detecting statistically significant differences. However, we found some improvement in functional performance (FEV1 in mL). Although that finding was statistically significant, FEV1 in percentage of the predicted value was not. That discrepancy can be explained by the fact that over 50% of our COPD patients were classified as having stage 1 or 2 disease according to the Global Initia-tive for Chronic Obstructive Lung Disease criteria. Therefore, those patients had higher FEV1 values, which meant that a relative increase of 145.7 mL represented a small proportion of the total value, leading to the underestimation of this finding. In addition, patients with severe COPD are older than are those with milder forms of the disease and are therefore less sensitive to educational interventions to improve inhaler technique and, consequently, to their potential beneficial impact. In our study, although adjusting for age had no effect on the results of the statistical analysis of functional and clinical impacts, age was found to be a determinant of the performance on inhaler technique tests. Further studies should be performed in elderly populations, because they have particular characteristics that might influence the inhaler technique and its impact. The fact that airway obstruction is more reversible in asthma patients might also justify a greater difference in their functional measurements, as well as in their perception of respiratory symptoms. These findings are consistent with those obtained in another study.(6) A large trial is currently ongoing in order to address the impact of different educational approaches on patients with COPD, and its results are expected to be enlightening.(7)

The establishment of a query surveillance program in the primary health care setting could represent one solution to the problem of limited patient knowledge of proper inhaler technique, allowing the treatment of a greater number of patients in the general population. In such a network, other health care professionals, such as physicians from other specialties, respiratory therapists, nurses, and pharmacists, could be involved in the education of those pa-tients. Some studies have tested the teaching of inhaler techniques and suggested that rechecking and regular re-fresher courses are needed, because proper inhalation technique deteriorates after the initial intervention.(8,9) The loss of skills is accompanied by the deterioration of asthma control as soon as three months after the intervention. Although various strategies can be used in order to provide this type of educational intervention, it is best delivered through verbal instructions and physical demonstration of the technique by a skilled educator, either on video or face to face, as we did in our study.(8,9) Some other educational techniques should be studied and tested in studies with appropriate designs, such as those involving large cohorts that provide large follow-up data sets. In addition, alterna-tive ways of integrating multidisciplinary teams and different health care professionals should be addressed, as should the effect of training those professionals to properly educate their patients in the use of their inhalers.

We conclude that educational interventions to teach inhaler techniques improve the performance of patients, lead-ing to improvements in the clinical and functional control of asthma. In COPD, the pathophysiological hallmark of irreversible obstruction might limit this benefit. Further studies on asthma should focus on patient outcomes that mat-ter, in terms of the impact that educational interventions to teach inhaler techniques have on patient performance of those techniques, such as decreasing the risk of exacerbations. The same approach should be adopted for COPD patients, adjusting sample sizes to optimize the statistical power of randomized control trials and obtain good evi-dence.

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