Heart stimulator with stimulation controlled by analysis of an average impedance morphology curve
First Claim
1. A heart stimulator comprising:
- a stimulation pulse generator that emits stimulation pulses adapted to stimulate a heart of a patient;
an impedance measuring unit having at least two measurement electrodes, and adapted to measure an impedance between said at least two measurement electrodes resulting from volume changes of at least one left chamber of a heart of the patient, said impedance measuring unit emitting an impedance signal corresponding to said impedance;
a calculation unit supplied with said impedance signal for calculating, for a predetermined pattern of said stimulation pulses, an average impedance morphology curve from said impedance signal during a time interval of a plurality of cardiac cycles of the heart; and
an analyzer supplied with said average impedance morphology curve for analyzing said average impedance morphology curve to generate a control signal for emission of said stimulation pulses to optimize hemodynamics of the patient.
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Abstract
A heart stimulator for electric stimulation of a patient'"'"'s heart has an impedance measuring unit that measures the impedance between at least two measurement electrodes implanted in a patient such that volume changes of at least one of the chambers of the left heart result in changes in the measured impedance. An analyzer analyzes the measured impedance for the control of the stimulation of the heart. A calculation unit calculates an average impedance morphology curve during a time interval of several cardiac cycles. The analyzer analyzes the average impedance morphology curve for use for the control of the stimulation to optimize the patient hemodynamics.
80 Citations
19 Claims
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1. A heart stimulator comprising:
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a stimulation pulse generator that emits stimulation pulses adapted to stimulate a heart of a patient;
an impedance measuring unit having at least two measurement electrodes, and adapted to measure an impedance between said at least two measurement electrodes resulting from volume changes of at least one left chamber of a heart of the patient, said impedance measuring unit emitting an impedance signal corresponding to said impedance;
a calculation unit supplied with said impedance signal for calculating, for a predetermined pattern of said stimulation pulses, an average impedance morphology curve from said impedance signal during a time interval of a plurality of cardiac cycles of the heart; and
an analyzer supplied with said average impedance morphology curve for analyzing said average impedance morphology curve to generate a control signal for emission of said stimulation pulses to optimize hemodynamics of the patient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification