A ventilator can be set to "breathe" a set number of times a minute. Sometimes it's set so that you can trigger the machine to blow air into your lungs. But, if you fail to trigger it within a certain amount of time, the machine automatically blows air to keep you breathing.
Rarely, a ventilator called a chest shell is used. This type of ventilator works like an iron lung—an early ventilator used by many polio patients in the last century. However, the chest shell isn't as bulky and confining as the iron lung. The chest shell fits snugly to the outside of your chest. A machine creates a vacuum between the shell and the chest wall. This causes your chest to expand, and air is sucked into your lungs. No breathing tube is used with a chest shell. When the vacuum is released, your chest falls back into place and the air in your lungs comes out. This cycle of vacuum and release is set at a normal breathing rate.
What To Expect While on a Ventilator
Ventilators normally don't cause pain. The breathing tube in the airway may cause some discomfort. It also affects the ability to talk and eat. If the breathing tube is a trach tube, the person may be able to talk. (A trach tube is put directly into the windpipe through a hole in the front of the neck.)
Instead of food, you may be given nutrients through a vein in your body. If you're on a ventilator for a long time, you'll likely get food through a nasogastric, or feeding, tube. The tube goes through your nose or mouth or directly into your stomach or small intestine through a surgically made hole.
A ventilator greatly restricts activity and also limits movement. You may be able to sit up in bed or in a chair, but you usually can't move around much. If you need to use a ventilator long term, you may get a portable machine. This machine allows you to move around and even go outside, although you need to bring your ventilator with you.
Sometimes the ventilator is set so that you can trigger the machine to blow air into your lungs. But, if you fail to trigger it within a certain amount of time, the machine automatically blows air to keep you breathing.