Congestive heart failure monitor
OwnerNils Holmstrom, Martin Obel +6inventors
InventorsNils Holmstrom, Martin Obel, Anna Norlin, Kenneth Dahlberg, Anders Bjorling, Sven Kalling, Karin Ljungstrom, Kjell Noren
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Abstract
A congestive heart failure monitor has an impedance measuring unit that measures the impedance between at least two electrodes implanted in a patient, to use a detected change of the measured impedance as an indication of a change in the left atrium volume. Any analyzing unit analyzes the measured impedance and detects insipient congestive heart failure dependent on a quotient of a maximum value of the measured impedance and a minimum value of the measured impedance during a cardiac cycle.
Claims16
1-17. (canceled)
A congestive heart failure monitor comprising:
- an impedance-measuring unit having two electrodes adapted to interact with a patient to measure an impedance representative of a change in a volume of the left atrium of the heart of the patient;
- and
- an analyzing unit supplied with a signal representing said impedance, said analyzing unit including a quotient determining unit that determines a quotient between a minimum value of said impedance and a maximum value of said impedance during a cardiac cycle of said heart, said analysis unit detecting congestive heart failure dependent on said quotient.
A multi-site heart stimulator comprising:
- a stimulation unit adapted to interact with cardiac tissue to electrically stimulate said cardiac tissue with pacing pulses;
- an impedance-measuring unit having two electrodes adapted to interact with a patient to measure an impedance representative of a change in a volume of the left atrium of the heart of the patient, and an analyzing unit supplied with a signal representing said impedance, said analyzing unit including a quotient determining unit that determines a quotient between a minimum value of said impedance and a maximum value of said impedance during a cardiac cycle of said heart, said analysis unit detecting congestive heart failure dependent on said quotient;
- and
- a control unit connected to said stimulation unit and to said monitor for controlling delivery of said pacing pulses by said stimulation unit dependent on detection of congestive heart failure by said monitor.
Dependencies are inferred from the claim text.