The invention relates to a respiratory-aid apparatus (1) capable of supplying a stream of gas to a patient (P), comprising a gas-transport pipe (2) for transporting a stream of gas, such as air measurement means (6) designed to measure at least one parameter representing the stream of gas and to supply at least one signal corresponding to said at least one parameter representing said stream of gas, for example the gas flow rate or pressure signal-processing means (8) designed to process said at least one signal from the measurement means (6) and to deduce therefrom at least one piece of information (I1, I2, I3) characterising a cardiac massage performed on a patient and display means (7) designed to display said at least one piece of information (I1, I2, I3) characterising a cardiac massage from the signal-processing means (8). The signal-processing means (8) are preferably capable of determining information representing the work (Wv, WT) provided by the massage or pressure and/or flow rate amplitudes resulting from the massage. The invention also relates to a monitoring method capable of being implemented by such a respiratory-aid apparatus (1).
