Robert Douglas Throne

US Patent:

50001892, Mar 19, 1991

Filed:

Nov 15, 1989

Appl. No.:

7/437079

Inventors:

Robert D. Throne - Ann Arbor MI
Janice M. Jenkins - Ann Arbor MI
Lorenzo A. DiCarlo - Ann Arbor MI

Assignee:

Regents of the University of Michigan - Ann Arbor MI

International Classification:

A61B 504

US Classification:

128702

Abstract:

A method and system are provided for monitoring electrocardiographic signals and detecting a pathological cardiac arrhythmia, such as ventricular tachycardia wherein the zero crossings of the first derivative of a reference template (i. e. reference waveform) are utilized to separate or partition both the template and each subsequent electrocardiographic signal being monitored into first and second sets of identifiable partitions. Each zero crossing is a boundary between adjacent partitions. Initially, the reference template is generated by acquiring a first set of wavefrom data representing a known good electrocardiographic signal. Identifiable partitions of the first set of data are then matched with corresponding identifiable partitions of the second set of data to obtain a performance measure signal. In one embodiment, the area beneath the derivative in each partition of the analyzed waveform is computed and compared (i. e. matched) to the corresponding area of the template.

US Patent:

54048800, Apr 11, 1995

Filed:

Oct 5, 1993

Appl. No.:

8/131648

Inventors:

Robert D. Throne - Lincoln NE

Assignee:

Board of Regents of University of Nebraska - Lincoln NE

International Classification:

A61B 504

US Classification:

128705

Abstract:

A computationally efficient two channel scatter diagram analysis algorithm for distinguishing monomorphic ventricular tachycardia (VT) from polymorphic ventricular tachycardia and ventricular fibrillation (VF). Scatter diagram analysis plots the amplitude from one channel (morphology) versus the amplitude from another channel (rate) on a graph with a fifteen-by-fifteen grid. A fraction or percentage of the 225 grid blocks occupied by at least one sample point is then determined. Monomorphic VT traces nearly the same path in space and occupies a smaller percentage of the graph than a non-regular rhythm such as polymorphic VT or VF.