Patent ID: 8768440

Claim:
An automatic method of determining local activation time (LAT) in multi-channel cardiac electrogram signals including at least two cardiac channels, one of the cardiac channels being a mapping channel and another cardiac channel being a reference channel, the method comprising: (a) estimating a cycle length CL in the reference channel; (b) determining a mapping-channel fiducial time t M in the mapping channel signal; (c) determining a plurality of reference-channel fiducial times t R ; (d) computing adjusted reference-channel fiducial times t RA by adding or subtracting multiples of cycle length CL to each time t R such that each time t RA is within a time window of length CL surrounding mapping-channel fiducial time t M ; (e) computing a single final reference-channel fiducial time t from the plurality of adjusted reference-channel fiducial times t RA ; and (f) computing the LAT as t M minus t RF .