| CPC A61B 5/349 (2021.01) [A61B 5/061 (2013.01); A61B 5/283 (2021.01); A61B 5/347 (2021.01); A61B 5/367 (2021.01)] | 5 Claims |
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1. A system, comprising:
an interface configured to receive intracardiac electrogram (IEGM) signals measured at a plurality of locations in a region of a heart that contains a His bundle of the heart, wherein the IEGMs are acquired using a mapping catheter positioned in a cardiac chamber; and
a processor, which is configured to:
process the IEGM signals to find respective local activation time (LAT) values at the plurality of the locations;
identify a cluster of the locations at which peaks in the IEGM signals, associated with the LAT values, occur later than a defined time;
for the locations in the identified cluster, calculate respective time differences between times of occurrence of the identified peaks and a reference time;
compare the time differences to a threshold value and retain the locations for which the time differences are below the threshold value;
filter the IEGM signals measured at the retained locations to identify respective high-frequency peaks in the IEGM signals;
calculate a normalized cross correlation coefficient for the identified high-frequency peaks, and identify a subset of the locations whose high-frequency peaks have a cross correlation coefficient that meets a predefined cross-correlation level;
tag the high-frequency peaks corresponding to the locations in the subset as His peaks;
generate an electrophysiological (EP) map of at least a portion of the region of a heart; and
indicate the tagged His peaks on the EP map of at least a portion of the region of the heart.
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