Clinic vs Home Spirometry for Monitoring Lung Function in Patients With Asthma

Area of Science:

• Pulmonary Medicine
• Respiratory Research
• Clinical Trials

Background:

• Limited studies exist on home versus clinic spirometry agreement in asthma patients.
• Conflicting results highlight the need for clarity, especially with the rise of telehealth.
• Understanding home spirometry's limitations is crucial for remote patient monitoring.

Purpose of the Study:

• To assess the agreement between home and clinic spirometry measurements of trough FEV1.
• To evaluate the reliability of home spirometry data in patients with uncontrolled asthma.

Main Methods:

• Post hoc analysis of data from two large asthma trials (CAPTAIN and 205832).
• Comparison of trough FEV1 measurements obtained via home spirometry and supervised clinic spirometry.
• Utilized time-course analyses and Bland-Altman plots to assess agreement.

Main Results:

• Home spirometry measurements showed lower magnitude and less consistency compared to clinic measurements.
• Bland-Altman plots indicated poor agreement between home and clinic trough FEV1 at baseline and week 24.
• Treatment-related FEV1 improvements were observed with both methods, but with differing reliability.

Conclusions:

• Home spirometry, as used in these studies, is not interchangeable with clinic spirometry for unsupervised readings in asthma.
• Findings may be device- and coaching-specific, requiring further research for optimization.
• The study underscores the need for validated home spirometry protocols for reliable remote asthma management.