Surgery – Diagnostic testing – Cardiovascular
Patent
1999-04-09
2000-09-05
Getzow, Scott M.
Surgery
Diagnostic testing
Cardiovascular
A61B 50468
Patent
active
061156272
ABSTRACT:
A medical device includes a sensing unit for creating digital data representing the electrical activity of a heart and a controller for, among other things, predicting the onset of an arrhythmia in the heart. From the digital data created by the sensing unit, the controller extracts data that represents the QRS complex of the heart cycle over several cardiac cycles and calculates the power spectrum for each QRS complex. Then, for each QRS complex, the controller calculates the fraction of energy in the power spectrum that falls within one or more frequency bands. The controller than calculates variance of these energy fractions over a number of cardiac cycles. A change, such as a decrease, in the variance presages the onset of an arrhythmia.
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Getzow Scott M.
Mitchell Steven M.
Pacesetter Inc.
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