Method and apparatus for event processing in biological applicat

Details Method and apparatus for event processing in biological applicat Method and apparatus for event processing in biological applicat

1996-06-03

1998-08-04

Hayes, Gail O.

Surgery

Diagnostic testing

Cardiovascular

600515, G06F15900

Patent

active

057886458

ABSTRACT:
A method and apparatus for processing biological signals on an event basis. An event low pass filter (LPF) is provided which passes variations in event features below an event cut-off value, which is analogous to the time-based cutoff frequency. An event high pass filter (HPF) is provided which passes variations in event features that are above an event-rate cutoff. An event variability detector is provided which determines the variation of a discrete variable from values at prior events. An event discriminator is provided for filtering out contributions of unrelated events that are superimposed on a discrete periodic measurement of interest. In all of these techniques, sampling of a biological signal is performed in coincidence with a biological event which does not occur at a constant frequency. In accordance with another aspect, an algorithm is provided using event-based techniques for discriminating abnormal rhythms from normal sinus rhythm on the basis of atrial rate, ventricular rate, and A-V intervals. An interval conditioning stage is provided for processing intervals of atrial beats, ventricular beats, and atrial to ventricular beats and classifying intervals for each according to an adaptive triple-bin technique. The three bins are defined as "current", "fast" and "slow" and each comprises memory space for storing the count of intervals stored into the particular bin and the average value of those intervals.

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patent: 4815017 (1989-03-01), DeCote, Jr.
patent: 4924875 (1990-05-01), Chamoun

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