Abstract: It is provided an electrode extension assembly comprising: a fastener for releasably fastening the electrode extension assembly to a user; a device holder for releasably holding a portable sensor device configured to capture electrocardiogram signals and audio signals; at least two extenders extending radially outwards from the device holder, wherein each extender comprises: a connector configured to connect to a respective electrode of the portable sensor device; an outer electrode connected at a distal end of the extender, the outer electrode being configured to be applied to a user; a conductor connected on one end to the connector and on the other end to the outer electrode; and an audio signal conveyor for conveying audio signals from the user to an audio sensor of the portable sensor device.

Abstract: It is provided a method for analysing heart data of a user. The method is performed in an analysis device and comprises the steps of: obtaining, from the portable sensor device, first electrocardiogram data, based on electrical signals measured by electrodes placed on the torso of the user; obtaining, from the portable sensor device, second electrocardiogram data, based on electrical signals measured by electrodes placed on two separate arms of the user; evaluating the first electrocardiogram data to determine whether there are any first abnormalities; evaluating the second electrocardiogram data to determine whether there are any second abnormalities; and determining that the heart is considered to need further examination only when there are both first abnormalities and second abnormalities.