Electro-anatomic cardiac repolarization mapping

A method for determining at least one repolarization value from Electrogram (EGM) data obtained from a heart using an electrode array, wherein the method is performed by at least one processor and/or circuitry wherein the method comprises:

• obtaining bipolar EGM data from the EGM data obtained from the heart by subtracting EGM data for a first electrode from EGM data for a second electrode where the first and second electrodes are adjacent to one another in the electrode array;
• determining at least one loop vector compound electrogram from the bipolar EGM data by:
• selecting an orthogonal set of electrodes where horizontally adjacent electrodes are on separate linear electrode arrays and vertically horizontal adjacent electrodes are on a same linear electrode array;
• forming an orthogonal set of bipoles using the selected orthogonal set of electrodes;
• deriving a vectorcardiogram-like loop from the orthogonal set of bipoles;
• identifying a T loop portion from the vectorcardiogram-like loop;
• and
• obtaining a derivative of the vectorcardiogram-like loop by obtaining a time projection of the T loop portion along a maximum axis of the T loop portion thereby forming the at least one loop vector compound electrogram;
• and
• determining the at least one repolarization value from the at least one loop vector compound electrogram.

A system for determining at least one repolarization value from Electrogram (EGM) data obtained from a heart, wherein the system comprises:

• an electrode array for obtaining EGM data from the heart;
• an instrumentation unit that is coupled to the electrode array and comprises circuitry that is configured to receive and preprocess the obtained EGM data;
• memory for storing program instructions;
• and
• at least one processor that is coupled to the memory and the instrumentation unit, wherein when the at least one processor executes the program instructions, wherein the at least one processor is configured to obtain at least one given loop vector compound electrogram by:
• selecting an orthogonal set of electrodes where horizontally adjacent electrodes are on separate linear electrode arrays and vertically horizontal adjacent electrodes are on a same linear electrode array:
• form an orthogonal set of bipoles using the selected orthogonal set of electrodes;
• derive a vectorcardiogram-like loop from the orthogonal set of bipoles;
• identifying a T loop portion from the vectorcardiogram-like loop;
• and obtain a derivative of the vectorcardiogram-like loop by obtaining a time projection of the T loop portion along a maximum axis of the T loop portion thereby forming the at least one loop vector compound electrogram;
• and determining the at least one repolarization value from the at least one loop vector compound electrogram.