Surgery – Diagnostic testing – Cardiovascular
Patent
1999-03-29
2000-10-03
Getzow, Scott M.
Surgery
Diagnostic testing
Cardiovascular
A61B 50402
Patent
active
061285269
ABSTRACT:
In determining whether a patient has ischemia or other conditions discernible in the variation occurring in the ST portion of the electrocardiogram signal, we filter out bad ST change parameters that are not changing at a rate representative of human ischemia ST change parameter rates of change. This can be used for driving therapy systems to alleviate cardiac ischemia. This filtering can be enhanced by using multiple cardiac electrical vectors for the electrogram signal vectors, and using a determination of Axis shift to modify filter parameters and the expected ranges of precursors to the ST change parameter (an ST change variable) to eliminate bad cardiac cycles, that is cardiac cycle information that may be misleading.
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Nelson Shannon
Sheldon Todd J.
Stadler Robert
Stylos Lee
Atlass Michael B.
Getzow Scott M.
Medtronic Inc.
Patton Harold R.
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