Method and apparatus for vector analysis of ECG arrhythmias

Details Method and apparatus for vector analysis of ECG arrhythmias Method and apparatus for vector analysis of ECG arrhythmias

1977-10-31

1979-01-30

Kamm, William E.

Surgery

Truss

Perineal

A61B 504

Patent

active

041366905

ABSTRACT:
ECG signals from two approximately orthogonal leads are combined in a rectangular-to-polar coordinate converter to obtain signals representing the magnitude and angle of the vector. The vector angle existing at the instant the magnitude of the QRS vector reaches its peak is first identified, and a voltage corresponding to the vector angle is sampled and stored for later use. Secondly, the vector angle existing at the instant the magnitude of the T-wave vector reaches its peak later in the cardiac cycle, is identified, and a voltage corresponding to this second vector angle is sampled and stored. The voltages representing the QRS and the T-wave vector angles are then applied to a differential amplifier to obtain a difference voltage representing the angular difference existing between the two maximal vectors. This angular difference possesses certain characteristics which are diagnostically significant. A classifying circuit determines which one of a number of angular ranges the angular difference falls into. A counter is provided for each angular range to accumulate over successive heartbeats the number of differences which have fallen into each of the angular ranges, and the cumulative counts are displayed.

REFERENCES:
patent: 3548813 (1972-12-01), Berner
patent: 3554187 (1972-01-01), Glassner
patent: 3572321 (1971-03-01), Bloomfield
patent: 3861387 (1975-01-01), Lawhorn et al.
patent: 3939824 (1976-02-01), Arneson et al.
Silcocks et al., "Proceedings of the 7th Annual Biomedical Sciences Instrumentation Symposium on Imagery in Medicine," Ann Arbor, Michigan, May 19-22, 1969, pp. 37-43.
Bourne, "Medical & Biological Engineering", vol. 12, No. 6, Nov. 1974, pp. 859-863.

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