Portable electrocardiogram monitor

A portable electrocardiogram monitor comprising:

• an electrode piece fixedly contacting a surface of a body of a user, for receiving an electrical signal corresponding to bioelectric current generated by contraction of heart muscles;
• a signal amplifier for amplifying the electrical signal received by the electrode piece;
• a processor for processing a signal amplified by the signal amplifier to acquire electrocardiogram waveform data;
• a display for displaying an electrocardiogram based on the electrocardiogram waveform data acquired by the processor;
• a reference data storing memory for storing reference data of the electrocardiogram waveform data;
• a comparator for comparing the electrocardiogram waveform data acquired by the processor with the reference data stored in the reference data storing memory;
• a determination unit for determining one of presence and absence of abnormality according to whether a difference between the electrocardiogram waveform data and the reference data, compared by the comparator, exceeds a permissible range;
• an alarm generator for raising an alarm when the determination unit determines the presence of abnormality;
• an operation switch having a preparatory mode button which turns on in a measurement preparatory stage and a measurement mode button which turns on during measurement;
• and
• reference data storing means including a gate which turns on when the preparatory mode button of the operation switch turns on, said reference data storing means supplying the electrocardiogram waveform data processed by the processor to the reference data storing memory through the gate and storing the electrocardiogram waveform data in the reference data storing memory as reference data.