Comparison of a portable, pneumotach flow-sensor-based spirometer (Spirofy™) with the vitalograph alpha Touch™ spirometer in evaluating lung function in healthy individuals, asthmatics, and COPD patients-a randomized, crossover study

Comparison of Spirofy™ and Vitalograph Alpha Touch™ Spirometers

Study Overview

Spirofy is India’s first portable, pneumotach flow-sensor-based digital spirometer designed for diagnosing asthma and COPD. This study compared Spirofy’s performance with the Vitalograph Alpha Touch spirometer in measuring lung capacities of healthy individuals, asthmatics, and COPD patients. The study also assessed the consistency between two Spirofy devices.

Key Findings

Ninety subjects participated in the study. The mean forced vital capacity (FVC) values obtained from Spirofy 1, Spirofy 2, and Vitalograph Alpha Touch were 2.60 L, 2.64 L, and 2.67 L, respectively. The mean forced expiratory volume in the first second (FEV1) values obtained from the devices were 1.87 L, 1.88 L, and 1.93 L, respectively. The Spirofy device demonstrated good sensitivity (97%), specificity (90%), and overall accuracy (93.3%) in detecting an FEV1/FVC ratio < 0.7 compared to the Vitalograph Alpha Touch spirometer. No variability was observed between the two Spirofy devices.

Conclusion

Spirofy is a portable, user-friendly device that is as accurate as the standard Vitalograph Alpha Touch spirometer for diagnosing COPD and asthma.

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