For the Airflow channel, what is the appropriate LFF, HFF, sensitivity, and sampling rate?

In sleep studies, the airflow channel is essential for assessing breathing patterns, and the settings for low frequency filter (LFF), high frequency filter (HFF), sensitivity, and sampling rate must be carefully chosen to accurately capture respiratory events while avoiding artifacts.

The appropriate LFF for the airflow channel should be set low enough to capture the slow changes in airflow associated with breathing without being influenced by movement or muscle artifacts, which is why a range of 0.1 - 15Hz is ideal. This allows the monitor to record the full range of respiratory rates encountered during sleep, including the deeper and shallower breaths.

The HFF setting should be selected to filter out higher frequency noise, which is often generated by electronic interference or other environmental factors. Setting it at 100Hz is standard and effective for capturing significant airflow changes without extra noise.

For sensitivity, 7 µV/mm is a standard value that provides sufficient amplitude for the recorded traces, ensuring they are neither too weak to interpret nor so strong that they saturate the system.

Lastly, the sampling rate of 100Hz is currently widely used in clinical settings for airflow measurements. This rate provides a suitable balance between data resolution and practicality, ensuring capture of necessary waveform details without excessive data volume that