Assessing Appropriate Use of Inhaler Devices among Asthmatic Patients

Background: Appropriate use of inhaler devices such as metered-dose inhalers (MDIs) and dry-powder inhalers (DPIs) in clinical practice is not well studied in Palestine and few were carried out in the Arab world. Objectives: The objectives of this study were to assess patients’ administration technique of inhaler devices and its association with other variables. Method: A cross sectional observational evaluation was conducted at a pulmonary clinic in Nablus, Palestine. Administration technique was evaluated based on a pre-defined checklist. Asthma control was assessed using Asthma Therapy Assessment Questionnaire (ATAQ) scale. Results: MDIs (without spacer) and DPIs (turbuhalers and aerolizers) in patients with asthma disease were studied. The study included 149 patients with mean ± standard deviation (SD) age of 47.5 ± 18.5 years. Fifty five (36.9%) of the study patients had college education and higher. Forty two (28.2%) patients were using MDIs, 38 (25.5%) were using DPIs and 69 (46.3%) were using both devices. A total of 217 inhaler devices were evaluated: 111 (51.2%) for MDI and 106 (48.8%) for DPI. Mean scores ± SD for correct inhaler technique were 61 ± 20.1, 71.4 ± 14.9 and 66.2 ± 15.7 for MDIs, turbuhalers and aerolizers respectively (p = 0.00). For MDI and DPI devices, step 3 “exhale to residual volume” was the least correctly done (22.5% and 13.2% respectively). There was a significant relationship between correct score of handling inhaler device and educational level (r = 0.187; p=0.006) where higher educated patients had higher correct scores. Among patients, ATAQ scale indicated that 22 (14.8%) patients had well controlled asthma, 56 (37.6%) patients were not well controlled and 71 (47.7%) patients were poorly controlled. There was significant difference in scores of correct inhaler device handling and asthma control category (p < 0.01) where patients had higher correct scores were with higher control for their asthma. Among patients using inhaled corticosteroids (ICS), there was a significant difference between adherence score and correct handling scores (p = 0.002) where patients with better adherence had higher correct scores. Conclusion: Correct handling of inhaler devices was not common particularly among MDI devices. Regular checking of inhalation technique and proper practical teaching of patients is crucial for optimal use of most inhaler devices.