Method and apparatus for determining ventricular fibrillation

Details Method and apparatus for determining ventricular fibrillation Method and apparatus for determining ventricular fibrillation

1980-03-19

1981-10-27

Kamm, William E.

Surgery

Truss

Pad

128419D, A61B 504

Patent

active

042967554

ABSTRACT:
A method for declaring the presence of ventricular fibrillation from an incoming electrocardiograph signal includes sampling the signal at a first frequency and filtering the same to produce a secondary frequency lower than the first frequency. This filtered signal is passed to a linear predictor which fits a model signal spectrum to the actual signal spectrum and computes coefficients representative of bandwith and mean frequency of the signal over a short time interval. The method then includes comparing the coefficient of bandwith with a preselected threshold value to determine whether it exceeds same, and, if so, comparing the coefficient of mean frequency with a range of values to determine whether it falls within that range whereby ventricular fibrillation is then declared to be present.
An apparatus to carry out the method substantially as described above, is included in this invention.

REFERENCES:
patent: 3598110 (1971-08-01), Edmark
patent: 3612041 (1971-10-01), Ragsdale
patent: 3654916 (1972-04-01), Neilson
patent: 3848586 (1974-11-01), Suzuki et al.
patent: 4022192 (1977-05-01), Lavkien
Nygards et al., "Computers in Cardiology", IEEE Computer Society, 1977, pp. 393-397.
Kuo et al., "Computers in Cardiology", IEEE Computer Society, 1978, pp. 347-349.
Makhoul, "Proceedings of the IEEE", vol. 63, No. 4, Apr. 1975, pp. 561-580.
Kyle et al., "Proceedings of the Conference on Applications of Electronics in Medicine", Southampton Hants Eng. 6-8, Apr. 1976, pp. 223-228.

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