Physiologic signal processing to determine a cardiac condition
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United States of America Patent
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Dec 27, 2011
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app pub date -
Nov 26, 2008
filing date -
Nov 30, 2007
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Abstract
In a method for determining a cardiac condition, a sensed physiologic signal for a period of time including multiple cardiac cycles is received. Using the received physiologic data, a heart beat frequency to be used as a reference frequency is determined. A plurality of harmonics of the received physiologic signal is extracted based on the reference frequency, wherein the harmonics correspond to a plurality of alternans frequencies. Amplitudes of at least some of the extracted harmonics are determined, and are used to determine an alternans indicator value.
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