A method of analyzing electrocardiogram (ECG) data, including data derived from a paper chart, includes the steps of providing ECG data to create a computer-readable ECG data file representative of the ECG chart, storing the ECG data file in a memory of a computer, opening the ECG data file and displaying on a computer display an ECG plot corresponding to the ECG data file, calibrating the x-axis and y-axis of the displayed ECG plot with an x-axis scale and a y-axis scale, identifying characteristics of the ECG plot by using an input device connected to the computer, and measuring the identified characteristics.
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