This invention relates to an electrode array suitable for measuring impedance across a patients lung, the array comprising: (i) two or more electrodes which are mounted on a substrate and are connectable to an electrical impedance segmentography monitor, and (ii) an adhesive surface for attaching the electrodes to the patients skin. This invention also relates to an electrical impedance segmentography monitoring system comprising: (i) an electrical impedance segmentography monitor, and (ii) two electrode arrays as described above which are connectable to the monitor.
