IMPLANTABLE HEART STIMULATOR DETERMINING LEFT VENTRICULAR SYSTOLIC PRESSURE
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Abstract
An implantable heart stimulator has an impedance measurement a cardiogenic impedance waveform using an impedance configuration arranged to measure myocardial contractility of the heart. The heart stimulator further has a calculating unit that calculates an estimate value being related to at least two impedance values of the waveform, or of an average waveform of several consecutive waveforms, during a predetermined time period of the waveform, or average waveform, the calculated estimate value being an estimate of the left ventricular (LV) systolic pressure.
3 Citations
32 Claims
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1-16. -16. (canceled)
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17. An implantable heart stimulator comprising:
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an impedance measurement circuit that measures and determines a cardiogenic impedance waveform with an impedance configuration that measures myocardial contractility of the heart; and a calculating unit supplied with said cardiogenic impedance waveform, said calculating unit being configured to calculate an estimate of left ventricular systolic pressure of said heart from two impedance values of said cardiogenic impedance waveform, selected from the group consisting of at least two impedance values of a single waveform, and at least two impedance values of an average waveform of a plurality of consecutive waveforms, during a predetermined time period of said cardiogenic impedance waveform, and to emit the calculated estimate value as an output from said calculating unit. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification