Twa measuring apparatus and twa measuring method

A TWA measuring apparatus comprising:

• a T-wave feature quantity measuring section which is configured to measure T-wave feature quantities of electrocardiogram waveforms acquired from a subject;
• a classifying section which is configured to classify the T-wave feature quantities into a group of odd electrocardiogram waveforms and a group of even electrocardiogram waveforms;
• a reliability index calculating section which is configured to calculate:
• a first representative value and a first dispersion value of the T-wave feature quantities in the group of odd electrocardiogram waveforms, and a second representative value and a second dispersion value of the T-wave feature quantities in the group of even electrocardiogram waveforms;
• a difference between the first and second representative values, to obtain a TWA feature quantity;
• and
• an adjustment value between the first representative value and the first dispersion value, and an adjustment value between the second representative value and the second dispersion value, to obtain a reliability index;
• and
• a reliability recognizing section which is configured to recognize:
• when the reliability index exceeds a threshold, that reliability of the TWA feature quantity is high;
• and
• when the reliability index does not exceed the threshold, that the reliability of the TWA feature quantity is low.