AeroPace therapy is an investigational treatment intended to help strengthen the diaphragm, the large muscle beneath the lungs that plays an important part in breathing.  While a person is on a mechanical ventilator (or breathing machine), the diaphragm does not get much use, because the ventilator is doing the breathing.  As with all muscles, when it is not used, the diaphragm can lose strength which makes it harder for a person to be weaned from (or no longer need) the ventilator.  Lungpacer therapy is designed to stimulate the nerves that activate the diaphragm to keep it in ‘shape’ and may help people wean from the ventilator more quickly to regain independent breathing.