Nasal/Oral Pressure Based Airflow
(using a cannula)
Definition:
The BioRadio includes a pressure sensor that, when connected to a cannula, detects the fluctuations in pressure caused by inspiration and expiration .
Typical Applications:
Cannulas are commonly used in sleep studies. Pressure based measurements reliably detect apnea, hypopnea, and the subtle flow limitation observed in the "Upper Airway Resistance Syndrome".
Typical BioRadio Configuration:
- When using a cannula, make sure you are set to Advanced View when programming your BioRadio.
- Coupling: DC
- Range: ±280 mV
Typical Setup:
Step 1:
Place the cannula between the nostrils and upper lip of the subjectStep 2:
There are three prongs on the thermistor—orient the side with two prongs pointed up with one prong slightly into each nostril. Step 3:
Bend the prong on the bottom of the cannula so the tip is positioned directly in front of (but not in) the subject’s mouthStep 4:
Tape the cannula in place, running the wires over the ears to behind the headStep 5:
Place two additional pieces of medical tape over the wires on the face further hold the cannula in placeStep 6:
Instruct the subject to sit up as straight as they can through the duration of data collection in order to ensure a change in body position doesn’t skew the data. Step 7:
Collect a baseline signal of the subject breathing normally.