Pacing system for optimizing cardiac output and determining heart condition
First Claim
1. A pacing system for providing pacing of a patient'"'"'s left heart, comprising:
- first means for obtaining indications of mechanical contractions of the right ventricle, said first means comprising an impedance measuring circuit for obtaining an impedance signal representative of impedance and processing means for processing said impedance signal;
left ventricular pacing means for pacing the left ventricle; and
LV control means for controlling the timing of said left ventricular pacing relative to indicated right ventricular mechanical contractions.
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Accused Products
Abstract
A pacing system and method for providing multiple chamber pacing of a patient'"'"'s heart, and in particular, pacing programmed for treatment of various forms of heart failure. The system utilizes impedance sensing for determining optimum pacing parameters, e.g., for pacing the left ventricle so that left heart output is maximized. The impedance sensing also is used for determination of arrhythmias or progression of heart failure. Impedance sensing is provided for between selected pairs of the four chambers, to enable optimizing of information for control and diagnosis. In a preferred embodiment, impedance measurements are obtained for determining the timing of right heart valve closure or right ventricular contractions, and the timing of delivery of left ventricular pace pulses is adjusted so as to optimally synchronize left ventricular pacing with the right ventricular contractions. Impedance sensing in the left heart also provides timing of mechanical contraction, and the pacemaker controls pacing to maintain bi-ventricular mechanical synchronization adjusted for maximum cardiac output.
216 Citations
12 Claims
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1. A pacing system for providing pacing of a patient'"'"'s left heart, comprising:
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first means for obtaining indications of mechanical contractions of the right ventricle, said first means comprising an impedance measuring circuit for obtaining an impedance signal representative of impedance and processing means for processing said impedance signal; left ventricular pacing means for pacing the left ventricle; and LV control means for controlling the timing of said left ventricular pacing relative to indicated right ventricular mechanical contractions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of cardiac pacing, comprising:
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cyclically determining, employing impedance signal measurement and processing means, mechanical events indicative of left ventricular contraction and right ventricular contraction; cyclically determining cardiac output from the patient'"'"'s left ventricle; pacing said patient'"'"'s left ventricle with varying timing relative to said right ventricular contractions and determining the relative mechanical synchronization of left ventricular and right ventricular contractions which results in maximum cardiac output; and maintaining said relative mechanical synchronization. - View Dependent Claims (12)
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Specification