The present apparatus relates to a bioelectric patient monitor, comprising an EKG-amplifier (1) and an EEG-amplifier (2) as well as a patient connecting cable (6), provided with at least five wires with their electrodes (7). The patient connecting cable (6) is connected to amplifiers (1 and 2) by way of a distributor switch (4). By selecting with distributor switch (4), it is possible to monitor either a 5-wire electrocardiogram or optionally a 3-wire electrocardiogram and electroencephalogram.