Majority of Hospitalized Patients With COPD Misuse Inhalers

Approximately two thirds of hospitalized adults with chronic obstructive pulmonary disease (COPD) received suboptimal treatment with inhalers, mainly resulting from errors, based on data from 96 individuals.

“Numerous studies have highlighted the significant issue of improper inhaler use in outpatient settings, but the extent of this problem within hospital settings remains poorly documented,” said lead author Gaël Grandmaison, MD, of the University of Fribourg, Fribourg, Switzerland, in an interview.

“This gap in knowledge is concerning, especially considering that several factors associated with suboptimal inhaler use, such as improper inhalation techniques, insufficient inspiratory flow, or the use of inhalers that are not suited to the patient’s specific characteristics, are associated with poorer disease control, more frequent exacerbations, and increased costs,” Grandmaison said.

To better characterize the prevalence of and factors associated with inhaler misuse in hospitalized patients with COPD, the researchers reviewed data from consecutive patients with COPD who were hospitalized in the general internal medicine department of a single institution between August 2022 and April 2023. Patients were assessed for peak inspiratory flow (PIF) and inhaler technique.

The primary outcome was the proportion of misused inhalers, which was defined as any inhaler used with either insufficient PIF and/or a critical error. The mean age of the patients was 71.6 years, 63% were men, and 67% were hospitalized for COPD exacerbations. Patients used 3.0 inhalers on average.

The study included 96 patients and 160 inhalers that were assessed at hospital admission. Overall, 111 were misused. Of those misused, 105 were associated with a critical error in the inhalation technique, and 22 were used with an insufficient PIF. After an episode of misuse, patients received targeted teaching on correct use that was repeated until they performed the technique without errors.

The percentage of inhaler misuse decreased over the course of the teaching sessions. The proportion of inhaler misuse decreased to 20.6%, 9.4%, and 5.6% after one, two, and three sessions, respectively.

“The inhalation technique was classified as ‘non-teachable’ if the patient continued to exhibit critical errors despite receiving three repetitions of the instructions,” the researchers wrote. Factors associated with inhaler misuse included cognitive disorders, fine motor disorders, poor coordination between inhaler activation and aspiration, and the inability to hold one’s breath.

Overall, the proportion of misused inhalers did not vary by age or gender. In an analysis at the patient level, 79 patients used at least one misused inhaler, 78 used at least one inhaler with a critical error, and 21 used inhalers with insufficient PIF.

“This study is particularly timely because reasons for hospitalization, such as COPD exacerbations or confusional states, could exacerbate the problem, leading to a potentially higher prevalence of suboptimal inhaler use compared to outpatient settings,” Grandmaison told Medscape Medical News.

The researchers also examined secondary outcomes including the prevalence of inhalers that were not suited to them and the number of patients using at least one misused inhaler.

The study findings confirm that suboptimal inhaler use is a significant problem in the hospital setting and provide new insights into the specific reasons behind this suboptimal usage, Grandmaison told Medscape Medical News.

“In the majority of cases, poor inhalation technique is the primary cause, which can generally be corrected through targeted therapeutic education,” she said. However, the study also revealed that 20% of patients are unable to use at least one of their inhalers correctly because of insufficient inspiratory force, she added. Another 10% struggle despite receiving proper instruction, often because of cognitive impairments or difficulty with fine motor skills, said Grandmaison.

The results underscore the need for a comprehensive approach to inhaler use in hospitalized patients that combines continuous therapeutic education with personalized assessment in order to improve technique and subsequently enhance patient outcomes, she said.

Changing Clinical Practice

“As hospital physicians, these findings have led us to systematically evaluate the inhalers used by COPD patients, regardless of their reason for hospitalization,” Grandmaison told Medscape Medical News. Consequently, the hospital has implemented an assessment of inhaler use among patients that includes a review of techniques, an evaluation of the appropriateness of the inhaler prescribed, and an algorithm to help clinicians choose the most appropriate inhaler, she added. Since its inception, the targeted intervention has significantly reduced improper inhaler use at discharge, she said.

Limitations and Next Steps

The findings were limited by several factors including the possible underreporting of misuse caused by inadequate PIF, a lack of consensus on what constitutes a critical error, and the small sample of patients from a single center.

Despite these limitations, the study adds to the understanding of improper inhaler use in the hospital setting, Grandmaison said. “Our subsequent research demonstrated that a systematic evaluation of inhalers, combined with therapeutic education and an algorithm to select an inhaler suited to the patient’s characteristics, significantly reduces the number of improperly used inhalers at hospital discharge,” she added.

However, several areas require further investigation, said Grandmaison. The most effective methods and frequency for teaching inhalation techniques must be defined, and more research is needed to understand the factors influencing PIF and its progression over the course of disease, she said. The next steps for the current research are to evaluate the impact of the intervention on long-term symptom control and disease progression, she noted. “Moreover, adapting the strategy developed in our institution for use in outpatient care is a priority, and multicenter studies would be valuable in validating these findings across different hospital settings,” she added.

In-Hospital Inhaler Education Falls Short

“Poor inhaler technique can lead to ineffective inhaler use and suboptimal treatment of COPD,” said Arianne K. Baldomero, MD, a pulmonologist and assistant professor of medicine at the University of Minnesota, Minneapolis, in an interview.

“The results from this study are consistent with prior studies showing a high prevalence of suboptimal inhaler use,” said Baldomero, who was not involved in the current study.

“The investigators also found that therapeutic education led to a significant reduction in the number of critical errors,” she said.

“What is surprising is that it can take up to three lessons to reduce this critical error down to 3.8%,” Baldomero told Medscape Medical News. “In most real-world clinic settings, many patients are not taught how to properly use inhalers, and many patients who receive inhaler technique education only receive instructions once,” she added.

Baldomero’s takeaway from the study is that teaching patients to properly use their inhalers is critical, but that this education may need to be repeated multiple times. The findings also remind clinicians that some types of inhaler delivery are not suited for patients who cannot generate adequate respiratory flow, she added.

Looking ahead, a larger sample size is needed to better identify which patients need additional teaching, Baldomero said. Also, the current study is limited by the focus on hospitalized patients. “I am interested in learning about the characteristics of patients in the outpatient settings who would benefit from additional inhaler teaching,” she noted.

The study was supported by a grant from the Hospital of Fribourg, Fribourg, Switzerland. The researchers had no financial conflicts to disclose. Baldomero had no financial conflicts to disclose.