Lung Function Monitoring; A Randomized Agreement Study.

Area of Science:

• Pulmonary Function Testing
• Medical Device Evaluation
• Respiratory Diagnostics

Background:

• Spirometry is crucial for diagnosing and monitoring respiratory diseases.
• Accurate and repeatable lung function measurements are essential for reliable clinical decisions.
• Variability between spirometry devices can impact patient management.

Purpose of the Study:

• To assess the agreement and repeatability of four different spirometry devices.
• To compare measurements of forced expiratory volume in 1 second (FEV1), forced vital capacity (FVC), peak expiratory flow (PEF), and forced expiratory flow at 50% of FVC (FEF50).

Main Methods:

• Fifty participants (20-64 years) performed maximum forced expiratory maneuvers.
• Measurements were taken using MasterScreen, SensorMedics, Oxycon Pro, and SpiroUSB spirometers in a randomized, blinded manner.
• Repeat testing occurred within 72 hours to evaluate within-device repeatability.

Main Results:

• SensorMedics and Oxycon Pro, along with MasterScreen and SpiroUSB, showed the most comparable values for lung function variables.
• 67% of comparisons met acceptable repeatability criteria (FEV1 and FVC ≤ 0.150 L).
• Oxycon Pro demonstrated the highest precision (lowest coefficients of repeatability) for FEV1, followed by MasterScreen, SensorMedics, and SpiroUSB.

Conclusions:

• Measurements from the same spirometer over time are comparable.
• Lung function values can vary significantly depending on the specific spirometer used.
• Clinical interpretation of spirometry data requires consideration of device-specific performance.