Comparison of the Forced Expiration Time Recorded by Two Spirometers with Different Types of Flow Sensors and the Acoustic Duration of Tracheal Noises

摘要

The forced expiratory times have been measured in 44 volunteers by means of spirometers equipped with a flow sensor of the Lilly type and a turbine flow sensor, and the acoustic durations of tracheal noises have been compared. The spirometric forced expiratory time has been found to depend on the flow sensor type; thus, its use for diagnosis is problematic.