Systolic function monitoring utilizing slope of measured impedance
First Claim
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1. A method for monitoring a heart comprising the steps of:
- (a) positioning a first electrode surface at a first position in a heart of a living subject;
(b) positioning a second electrode surface at a second position in said heart;
(c) deriving an impedance value indicative of an impedance between said first and second electrode surfaces;
(d) determining a positive rate of change of said impedance value at a first point of a heart cycle of said heart;
(e) determining a negative rate of change of said impedance value at a second point of said heart cycle;
(f) determining a ratio between said positive rate of change and said negative rate of change; and
(g) monitoring said ratio over a plurality of heart cycles of said heart.
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Abstract
A heart monitoring device has a control circuit, the control circuit being adapted to be electrically connected to electrode surfaces arranged at two different positions of the heart. The control circuit derives an impedance value indicative of the impedance between the electrode surfaces. Furthermore, the control circuit is arranged to determine and monitor a relationship between a positive rate of change and a negative rate of change of the impedance value. The device can, in particular, be used to detect and treat a systolic dysfunction of a heart.
45 Citations
30 Claims
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1. A method for monitoring a heart comprising the steps of:
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(a) positioning a first electrode surface at a first position in a heart of a living subject; (b) positioning a second electrode surface at a second position in said heart; (c) deriving an impedance value indicative of an impedance between said first and second electrode surfaces; (d) determining a positive rate of change of said impedance value at a first point of a heart cycle of said heart; (e) determining a negative rate of change of said impedance value at a second point of said heart cycle; (f) determining a ratio between said positive rate of change and said negative rate of change; and (g) monitoring said ratio over a plurality of heart cycles of said heart. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A heart monitoring device comprising:
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a control circuit having an electrical connection adapted for electrical connection to a first electrode surface disposed at a first position of a heart and to a second electrode surface disposed at a second position of a heart; and said control circuit deriving an impedance value indicative of an impedance between said first electrode surface and said second electrode surface, determining a positive rate of change of said impedance value at a first portion of a heart cycle, determining a negative rate of change of said impedance value at a second portion of a heart cycle, determining a ratio between said positive rate of change and said negative rate of change, and monitoring said ratio over a plurality of heart cycles. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A heart monitoring system comprising:
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a first electrode surface adapted for positioning at a first position of a heart and a second electrode surface adapted for position at a second position of a heart; and a control circuit electrically connected to said first and second electrode surfaces, said control circuit deriving an impedance value indicative of an impedance between said first electrode surface and said second electrode surface, determining a positive rate of change of said impedance value at a first portion of a heart cycle, determining a negative rate of change of said impedance value at a second portion of a heart cycle, determining a ratio between said positive rate of change and said negative rate of change, and monitoring said ratio over a plurality of heart cycles. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification