A Comparative Analysis of Peak Expiratory Flow Rates: Insights from Peak Flow Meter and Digital Spirometer

Abstract

Background: Peak expiratory flow rate (PEFR) is a vital pulmonary function parameter used to assess airway obstruction. While peak flow meters are simple and portable, digital spirometers offer more precise and detailed readings. This study aims to compare PEFR values obtained from peak flow meters and digital spirometers in various age groups and conditions.

Methods: A retrospective study was conducted on 90 individuals aged 18–65 years, divided into three groups: Group A (healthy individuals), Group B (asthmatics), and Group C (patients with chronic obstructive pulmonary disease - COPD). PEFR was measured using both devices under standardized conditions. Statistical analyses compared the mean PEFR values and correlation coefficients between devices for each group.

Results: PEFR values obtained from digital spirometers were consistently higher across all groups compared to peak flow meters, with mean differences of 12.5 L/min in Group A, 18.3 L/min in Group B, and 22.7 L/min in Group C. Strong correlations (r > 0.85) were observed between devices, indicating reliability. However, variability was more pronounced in COPD patients.

Conclusion: Both devices showed strong agreement in PEFR measurement, but digital spirometers demonstrated higher accuracy and consistency, particularly in individuals with compromised pulmonary function. Peak flow meters remain useful for routine monitoring, while spirometers offer superior precision for diagnostic purposes.