RIP (respiratory inductive plethysmography)
Definition:
RIP uses an alternating current (AC) to generate a magnetic field that is used to examine respiratory effort.
Typical Applications:
Clinically, RIP is often combined with other respiratory sensors (such as nasal/oral airflow sensors) to assess inspiratory and expiratory flow limitation and breathing effort. The signals are also useful for cardio-respiratory research applications.
Typical BioRadio Configuration:
- When using a RIP band, make sure you are set to Advanced View when programming your BioRadio.
- Coupling: DC
- Range: ±18 mV
- Filter: 2nd order, lowpass Butterworth with upper cutoff 2 Hz
Typical Setup:
• This belt should be placed on the torso:
Step 1:
Securely fasten one belt around the subject just above the stomachStep 2:
Securely fasten the second belt around the subject just below the rib cage- In these positions, both diaphragm and chest breathing should be captured.
Common Questions:
Q: I want to perform double banded respiration. Where should I place the two RIP bands?
A:
One belt should be placed just above the stomach with the other placed just below the rib cage. RIP bands have a sensor that span the circumference of the band, so you do not need to have a specific portion of the bands centered on the chest or abdomen.
Q: Why am I not seeing a change in the signal?
A:
The bottom RIP belt may be too low on the torso, causing little to no change in the cross sectional areas during breathing. Optimal placement is mid-chest for the top band and just above the belly button for the second band.
Q: Why is my signal much larger than expected?
A:
The bands may be placed too tightly on the torso, thus restricting the actual cross sectional change of the belt. Loosen the belt and see Typical Setup for tips about optimizing the signal.
Q: Which direction of the signal (positive versus negative) correlates to inhaling and which correlates to exhaling?
A:
When inhaling, the signal should increase. When exhaling, the signal should decrease