Surgery – Truss – Pad
Patent
1981-09-22
1984-02-07
Howell, Kyle L.
Surgery
Truss
Pad
A61B 502
Patent
active
044297017
ABSTRACT:
In the described method and apparatus for examining a subject's cardiovascular system, a blood-pressure signal having a waveform varying in accordance with the subject's arterial pressure is differentiated to produce a dP/dt signal having a waveform varying in accordance with the rate at which the blood-pressure signal varies. The pressure at the time of the peak dP/dt signal is detected and is divided by the dP/dt signal to produce a measurement corresponding to the systemic vascular resistance. The latter measurement is then multiplied by a resistance factor corresponding to the physical resistance characteristic of the particular cardiovascular system examined. A measurement of the cardiac output may also be produced by subtracting, from the mean arterial pressure of the subject, the subject's central venous pressure and dividing the latter by the systemic vascular resistance.
REFERENCES:
patent: 4203451 (1980-05-01), Panico
Brower; R. et al., "A Device for the Calculation of dP/dt/P with Internal Calibration", IEEE Transactions on Biomed Engrg., vol. BME-21, No. 1, Jan. 1974.
George; M. et al., "Measurement of the Maximum Rate of Rise of Aortic Blood Pressure in Man", Med. Research Engrg., 1967, pp. 21-24.
Goor Daniel
Mohr Raphael
Barish Benjamin J.
Howell Kyle L.
Jaworski Francis J.
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