Neural triggering (new triggering – mechanism of action) – very oversimplified explanation.
Brain receives a multitude of inputs (ex: pH, PaO2, carotid body sensors, stretch receptors, etc.)
Brain sends a composite signal (final summation signal) down the phrenic nerve.
NAVA catheter picks up final summation signal (Edi or EAdi – aka electrical activity of the diaphragm).
An Vt (tidal volume) proportional to the Edi is delivered.
Net result : improved patient control of breath and improved patient-ventilator synchrony.