¶ Introduction
Lung volume recruitment (LVR) refers to a process whereby the lungs can be filled closer to their maximum volume than they would by breathing naturally.
The objective of lung volume recruitment is to improve breathing by expanding areas of the lungs which do not expand well with only natural breathing. Certain areas of the lungs may collect secretions, such as phlegm; lungs with poor expansion may not be able to expel these secretions.
¶ Lung Volume Recruitment Bags
A lung volume recruitment (LVR) bag is a manual resuscitation device with the addition of a one-way valve which prevents air from escaping.
An LVR bag is based on a manual resuscitation device, but cannot be used as one.
The user takes the largest breath possible; the bag is then squeezed repeatedly to further fill the lungs with air. The one-way valve causes "breath stacking" whereby more and more air enters the lungs with each squeezing of the bag.
¶ Directions for Use
An individual with significant muscle atrophy in their upper limbs will need an assistant to operate the LVR bag.
Refer to the following external links for directions on how to use a lung volume recruitment bag.
- LVR Bag Instructions (PDF) by NHS - St. George's University Hospitals
- LVR Bag Instructions (PDF) by CANVent
- LVR Bag Instructions (YouTube) by CANVent
¶ Other LVR Techniques
Other lung volume recruitment techniques, such as deep breathing exercises, are not typically used with ALS patients. Poor lung volume recruitment in ALS patients is caused by weakness of the breathing muscles; other techniques are not effective in mitigating this.