Respiratory resistance measured by an airflow perturbation device.

  title={Respiratory resistance measured by an airflow perturbation device.},
  author={Christopher G Lausted and Arthur T. Johnson},
  journal={Physiological measurement},
  volume={20 1},
The airflow perturbation device (APD) is an instrument for the measurement of respiratory resistance. The APD is small, lightweight, fast and requires no special breathing manoeuvres. Airflow perturbation determines resistance by superimposing a periodic signal onto spontaneous breathing with a variable resistance device. Respiratory impedance is the ratio of magnitude of pressure perturbation to magnitude of flow perturbation, and respiratory resistance is the in-phase portion of respiratory… CONTINUE READING
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