Implantable cardiac stimulator with analyzer that continously co

Details Implantable cardiac stimulator with analyzer that continously co Implantable cardiac stimulator with analyzer that continously co

1994-11-17

1996-09-17

Kamm, William E.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

128699, A61B 504, A61N 136, A61N 1362

Patent

active

055564194

ABSTRACT:
A device for identifying abnormal conditions in a heart retrograde conduction and tachyarrhythmias in particular, includes a differentiating circuit electrically connected to a heart to be monitored in order to differentiate ECG signals from the heart. The differentiated signal is plotted against the ECG signal. The radius (distance from a point on the resulting curve from the origin of the plot axes) in the resulting curve is calculated in a calculator unit. The radius obtained is then compared with a threshold value in a comparator and a sequence for the progression of the radius in relation to the threshold value is obtained and compared with previously obtained sequences stored in a sequence analyzer.

REFERENCES:
patent: 4457315 (1984-07-01), Bennish
patent: 4700712 (1987-10-01), Schmid
patent: 4754753 (1988-07-01), King
patent: 4905705 (1990-03-01), Kizakevich et al.
patent: 5101833 (1992-04-01), Schmid
patent: 5306293 (1994-04-01), Zacouto
patent: 5413109 (1995-05-01), Ekwall
patent: 5427112 (1995-06-01), Noren et al.
"Phase Plane Plot of Electrograms as a Marker of Ventricular Electrical Instability During Acute Ischemia: Initial Experimental Results and Potential Clinical Applications," Karagueuzian et al., PACE, vol. 15, Nov. 1992, pp. 2188-2193.

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