Multi-channel cardiac measurements
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United States of America Patent
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Jul 1, 2014
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N/A
app pub date -
May 6, 2013
filing date -
Mar 15, 2013
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Abstract
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 tM in the mapping channel signal; (c) determining a plurality of reference-channel fiducial times tR; (d) computing adjusted reference-channel fiducial times tRA by adding or subtracting multiples of cycle length CL to each time tR such that each time tRA is within a time window of length CL surrounding mapping-channel fiducial time tM; (e) computing a single final reference-channel fiducial time tRF from the plurality of adjusted reference-channel fiducial times tRA; and (f) computing the LAT as tM minus tRF.
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