- Diaphragm peak potential (Edipeak), diaphragm potential difference (Edipeak-Edimin), NAVA level, neural ventilation efficiency (NVE = Vt / Edipeak-Edimin) when mechanical apnea according to NAVA method at the time To, T1, T6, T12, T24, T48, T72, T96 and Tket - Parameter length of the esophagus catheter to the body.