Real-World Status of Medical Care and Treatment of Chronic Obstructive Pulmonary Disease by Respiratory Specialists in Japan

Real-World Treatment Patterns and Patient-Reported Outcomes in Chronic Obstructive Pulmonary Disease in Japan: The REMIND Study

INTRODUCTION

Symptom status and treatment changes among patients with chronic obstructive pulmonary disease (COPD) using inhaler treatment in real-world clinical settings are not well understood, particularly according to class of treatment. We investigated the proportion of symptomatic patients among those with COPD using inhaler treatment, based on COPD Assessment Test (CAT) scores in clinical practice, and changes in inhaler treatments and symptoms at 1-year follow-up.

METHODS

This was a retrospective analysis of data from a multicenter, prospective cohort study conducted at medical institutions with respiratory specialists in Japan. The primary endpoint was the proportion of patients with CAT scores ≥ 10 or < 10 in each inhaler treatment group at registration.

RESULTS

Of 414 patients in the full analysis set, 76 (18.4%), 261 (63.0%), and 77 (18.6%) were using long-acting muscarinic antagonist (LAMA), LAMA + long-acting β2-agonist (LABA), and inhaled corticosteroids (ICS) + LABA, respectively, at registration. The proportions of patients with CAT scores ≥ 10 or < 10 per inhaler treatment group at registration, respectively, were 32.9% and 67.1% in the LAMA group, 55.0% and 45.0% in the LAMA + LABA group, and 50.0% and 50.0% in the ICS + LABA group. Most patients (> 75%) in each inhaler treatment group showed no change in inhaler treatment at 1 year, regardless of their CAT score at registration. Approximately 70-80% of patients with CAT scores ≥ 10 at registration still had CAT scores ≥ 10 at 1 year; 10-30% of patients with CAT scores < 10 at registration had CAT scores ≥ 10 at 1 year.

CONCLUSION

In real-world Japanese clinical practice, a considerable proportion of patients have persistent symptoms (CAT score ≥ 10) despite using mono or dual inhaler treatment; > 75% of symptomatic patients with COPD using inhaler treatment did not undergo treatment escalation at 1-year follow-up and remained symptomatic.

TRIAL REGISTRATION

ClinicalTrials.gov identifier, NCT05903989.

Management goals and stable phase management of patients with chronic obstructive pulmonary disease in the Japanese respiratory society guideline for the management of chronic obstructive pulmonary disease 2022 (6th edition)

Chronic obstructive pulmonary disease (COPD) is characterized by airflow obstruction on spirometry and symptoms such as dyspnea on exertion and chronic cough with sputum production, thus making it a significant healthcare issue worldwide. Japanese patients with COPD have unique characteristics compared to patients in Western countries, including older age and lower exacerbation frequency. The Japanese Respiratory Society (JRS) published the 6th edition of the COPD guideline in June 2022. This article introduces the management goals of COPD and describes its management during the stable phase, as outlined in the guideline. Management goals include improving the current status, such as the symptoms, quality of life (QOL), exercise tolerance, and physical activity, and reducing future risks through prevention of exacerbation and suppression of disease progression to prevent shortening of healthy life expectancy. Management plans should include avoidance of causative substances, assessment of disease severity, and personalized treatment plans. Pharmacotherapy using inhalation bronchodilators is a key component of the treatment of stable COPD. Bronchodilators, including short- and long-acting dilators, are commonly used to relieve symptoms and improve QOL. Inhaled corticosteroids (ICSs) are used in combination with long-acting bronchodilators, especially in patients with asthma and COPD overlap, or those experiencing frequent exacerbation of eosinophilia. Combination therapy with a long-acting muscarinic antagonist (LAMA), a long-acting beta 2 agonist (LABA), and ICS is expected to improve QOL and respiratory function and reduce mortality and exacerbation compared to the LAMA + LABA combination. Non-pharmacological therapies, including smoking cessation and pulmonary rehabilitation, should also be considered.

Real-World Evidence on the Diagnostic and Clinical Characteristics of Asthma in Japanese Patients with COPD: The ACO Japan Cohort Study

Introduction

The ACO Japan Cohort Study, a multicenter observational study, investigated the proportion of patients with chronic obstructive pulmonary disease (COPD) who met the Japanese Respiratory Society (JRS) asthma-COPD overlap (ACO) diagnostic criteria, characteristics of ACO and non-ACO patients, and the patient transitions between ACO/non-ACO diagnosis over 2 years.

Patients and Methods

Patients with COPD were consecutively enrolled between June and December 2018 and followed up continuously for 2 years. All participating study sites were medical institutions where respiratory specialists routinely conducted medical examinations/tests required for ACO diagnosis.

Results

Among 708 patients with COPD, 101 (14.3%), 118 (16.7%), and 125 (17.7%) were diagnosed with ACO at registration, 1 year, and 2 years, respectively. In total, 22.6% of patients lacked the data necessary for ACO diagnosis throughout the 2 years. Among patients who had the necessary data for ACO diagnosis, 24.7% were diagnosed with ACO at 2 years. More ACO patients had moderate or severe exacerbations in the past year than non-ACO patients at registration (15.8% vs 6.3%, p = 0.049) and 1 year (19.4% vs 7.6%, p = 0.025). ACO patients had a greater decrease in mean forced expiratory volume in one second over 2 years than non-ACO patients (-92.0 vs 43.4 mL). Among patients diagnosed with ACO at registration, 21.4% transitioned to non-ACO after 1 year. Conversely, almost all non-ACO patients at registration remained non-ACO after 1 year.

Conclusion

COPD patients with ACO determined by the JRS criteria had a high risk of exacerbations and a rapid decline in respiratory function, indicating that the JRS criteria for ACO are useful for identifying high-risk COPD patients. Testing necessary for ACO diagnosis is insufficiently performed even in real-world clinical practice of COPD specialists.