Apparatus and method for measuring cardiac output

Details Apparatus and method for measuring cardiac output Apparatus and method for measuring cardiac output

1993-05-14

1995-06-13

Cohen, Lee S.

Surgery

Truss

Pad

128693, 128734, A61B 504

Patent

active

054233267

ABSTRACT:
The present invention reliably computes cardiac output with a noninvasive procedure. The system measures the electrical impedance of a patient's body, during a time interval of interest. The system then obtains frequency transforms of various time segments of the first derivative of the impedance signal. Each such transform is integrated over a frequency range of interest, and the values of the integrals are plotted as a function of time. The graph so derived has characteristic extrema which can be used to identify critical points in the impedance derivative signal. These critical points can be used to determine parameters which are used in a calculation of stroke volume and cardiac output.

REFERENCES:
patent: Re30101 (1979-09-01), Kubicek et al.
patent: 3340867 (1967-09-01), Kubicek et al.
patent: 3452743 (1969-07-01), Rieke
patent: 3730171 (1973-05-01), Namon
patent: 3742936 (1973-07-01), Blanie et al.
patent: 3835839 (1974-09-01), Brown
patent: 3835840 (1974-09-01), Mount
patent: 3871359 (1975-03-01), Pacela
patent: 3874368 (1975-04-01), Asrican
patent: 3882851 (1975-05-01), Sigworth
patent: 3976052 (1976-08-01), Junginger et al.
patent: 3994284 (1976-11-01), Voelker
patent: 3996925 (1976-12-01), Djordjevich
patent: 4137910 (1979-02-01), Murphy
patent: 4305400 (1981-12-01), Logan
patent: 4361049 (1982-11-01), Volgyesi
patent: 4422458 (1983-12-01), Kravath
patent: 4437469 (1984-03-01), Djordjevich et al.
patent: 4450527 (1984-05-01), Sramek
patent: 4562843 (1986-01-01), Djordjevich et al.
patent: 4641260 (1987-02-01), Fukukita et al.
patent: 4676253 (1987-06-01), Newman et al.
patent: 4757824 (1988-07-01), Chaumet
patent: 4807638 (1989-02-01), Sramek
patent: 4862361 (1989-08-01), Gordon et al.
patent: 4870578 (1989-09-01), Vysin et al.
patent: 4979110 (1990-12-01), Albrecht et al.
patent: 5025784 (1991-06-01), Shao et al.
patent: 5046504 (1991-09-01), Albert et al.
patent: 5101828 (1992-04-01), Welkowitz et al.
patent: 5103828 (1992-04-01), Sramek
patent: 5109862 (1992-05-01), Kelen et al.
patent: 5178151 (1993-01-01), Sackner
patent: 5178154 (1993-01-01), Ackmann et al.
patent: 5309917 (1994-05-01), Wang et al.
Kizakevich et al, "Continuous Noninvasive Cardiac Monitoring etc.", Proc. Symp. on Computers in App. Med. Care, 1977 pp. 325-336.
Kizakevich et al, "an Automated System for Systolic Time Interval Analysis", Proc. Dig. Eq. Comp. Users Soc., 1976, pp. 795-798.
Gollan et al, "Continuous Electrode Monitoring etc.", British Heart Journal, 1978, pp. 1390-1396.
Geddes, "The Measurement of Cardiac Output and Blood Flow", from Cardiovascular Devices and their Applications, pp. 100-135.
Sramek, "Electrical Bioimpedance", 1983, pp. 95-105.
Miyamoto et al, "Continuous Determination of Cardiac Output etc.", Med. & Biol. Eng. & Computing, 1981, pp. 638-644.
Miyamoto et al, "Automatic Determination of Cardiac Output etc" Proc. 5th Int'l Conf. on Electr. Bio-Impedance, 1981, pp. 45-48.
Miyamoto et al, "Automatic Determination of Cardiac Output etc" Biotelemetry Patient Monitoring, 1981, pp. 189-203.
Sramek et al, "Stroke Volume Equation etc.", Proc. 6th Int'l Conf. on Electr. Bioimpedance, 1983, pp. 1-2.
Sramek, "Cardiac Output by Electrical Impedance", 1982, pp. 93-97.
Sramek, "Noninvasive Technique for Meas. of Cardiac Output etc" Proc. 5th Int'l Conf. on Electr. Bioimped., 1981, pp. 39-42.
Kubieck et al, "Development and Evaluation of an Impedance Cardiac Output Sys.", Aerospace Medicine, 1966, pp. 1208-1212.
Kubicek et al, "the Minnesota Impedance Cardiograph-Theory and Applications", Biomed. Eng. 1974, pp. 410-416.

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