Surgery – Truss – Perineal
Patent
1976-09-30
1979-02-06
Kamm, William E.
Surgery
Truss
Perineal
A61B 502
Patent
active
041379101
ABSTRACT:
A method and system for measuring and monitoring the dynamics of left ventricular contraction by analyzing the signals from an electrocardiogram and signals corresponding to either an invasive aortic pressure pulse (obtained during catherization) or a non-invasive carotid arterial pulse (measured with a piezoelectric crystal). The pressure pulses are differentiated and amplified to produce data indicative of systolic blood flow. This blood flow data is then integrated during the ejection period in synchronism with pulses derived from the electrocardiogram to produce data indicative of the ejected stroke volume. This per beat volumetric data is further integrated over a uniform one minute time interval to yield cardiac output information. The differentiated pressure pulses are further differentiated and amplified to obtain data indicative of the left ventricular forces inparted to the blood flow during systole.
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patent: 3361128 (1968-01-01), Colman
patent: 3920004 (1975-11-01), Nakayama
patent: 3996925 (1976-12-01), Djordjevich
patent: 4023563 (1977-05-01), Reynolds et al.
patent: 4038976 (1977-08-01), Hardy et al.
George et al., "Medical Research Engineering" Fourth Quarter, 1967, pp. 21-24.
Kamm William E.
Loveman Edward H.
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