A electrocardiograph having a chest assembly intended to be applied to the chest region of a patient and an electronic unit is provided, with a recording module and with a wireless transceiver module. The chest assembly has a plurality of electrodes configured to be connected to the patient's body for the recording of an electrocardiogram and respective electrical wires connecting each electrode to the electronic unit. The chest assembly further includes a housing to which the electrical wires are respectively fixed. The electronic unit has a Hall-effect magnetic sensor configured to selectively allow it to mark, to start, stop, record and send an electrocardiogram to a telecommunications network. The electrocardiograph further includes a magnet mounted on a supporting member configured to be worn by a patient to activate the Hall-effect magnetic sensor.
