Accurate ECG I-point and J-point detection and measurement

A method for detecting and annotating the I-point of an electrocardiography (ECG) waveform during measurement of the ECG waveform, comprising:

• receiving electrical impulses from a beating heart using two or more electrodes;
• detecting the electrical impulses from at least one pair of electrodes of the two or more electrodes and converting the electrical impulses to an ECG waveform for each heartbeat of the beating heart using a detector;
• receiving the ECG waveform for at least one heartbeat from the detector, converting the ECG waveform to a frequency domain waveform, separating the frequency domain waveform into two or more different frequency domain waveforms, and converting the two or more different frequency domain waveforms into a plurality of time domain cardiac electrophysiological subwaveforms and discontinuity points between these subwaveforms of the ECG waveform using a processor;
• comparing the plurality of subwaveforms and discontinuity points to a database of subwaveforms and discontinuity points for cardiac electrophysiological signals of ECG waveforms for a plurality of known and normal and abnormal patients using the processor;
• identifying a discontinuity point of the plurality of subwaveforms and discontinuity points as an I-point of the ECG waveform based on the comparison using the processor;
• and
• displaying the ECG waveform for the at least one heartbeat of the beating heart, displaying a marker at a location of the discontinuity point on the ECG waveform, and identifying the markers as the I-point using a display device.

An invasive electrocardiography (ECG) system for measuring and annotating the I-point of an ECG waveform during measurement of the ECG waveform, comprising:

• two or more electrodes placed directly on the surface of a beating heart of a patient that receive electrical impulses from the beating heart;
• a detector that detects the electrical impulses from at least one pair of electrodes of the two or more electrodes and converts the electrical impulses to an ECG waveform for each heartbeat of the beating heart;
• a processor that
• receives the ECG waveform for at least one heartbeat from the detector, converts the ECG waveform to a frequency domain waveform, separates the frequency domain waveform into two or more different frequency domain waveforms, and converts the two or more different frequency domain waveforms into a plurality of time domain cardiac electrophysiological subwaveforms and discontinuity points between these subwaveforms of the ECG waveform,
• compares the plurality of subwaveforms and discontinuity points to a database of subwaveforms and discontinuity points for cardiac electrophysiological signals of ECG waveforms for a plurality of known and normal and abnormal patients, and
• identifies a discontinuity point of the plurality of subwaveforms and discontinuity points as an I-point of the ECG waveform based on the comparison;
• and
• a display device that displays the ECG waveform for the at least one heartbeat of the beating heart, displays a marker at a location of the discontinuity point on the ECG waveform, and identifies the marker as the I-point.