An appliance (1) for enteral nutrition by means of a probe of the type comprising a tubular element of elongated shape and substantially flexible which defines a feeding channel open at the extremities for the introduction of nutritional substances in the stomach of a patient and which comprises at least a first inflatable balloon for detecting the pressure inside the oesophagus of a patient, the tubular element comprising at least a first inlet/outlet mouth for the air in/from the first balloon, the appliance (1) further comprising: - at least a pneumatic circuit (3) having pumping means (4) associable at least with the first inlet/outlet mouth for inflating/deflating the first balloon; - processing means (8) comprising: o detection means which can be connected to the first balloon to detect the patient's oesophageal pressure (pes); o reading means of the pressure of the respiratory tract (paw) which can be connected to an external detection device; o calculation means operatively connected to the detection means and to the reading means and able to calculate at least the transpulmonary pressure (ptp); - graphic display means (10) operatively connected to the processing means (8) and able to display at least one of the oesophageal pressure (pes), the pressure of the respiratory tract (paw) and the transpulmonary pressure (ptp).