Pacemaker and method having optimized A-V delay by using the evoked depolarization potential as an indicia of cardiac output
First Claim
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1. A pacemaker for regulating a patient'"'"'s heart, comprising:
- a measuring element for measuring an evoked depolarization potential indicative of the diastolic volume of blood in a chamber of the patient'"'"'s heart;
a pacing parameter generator for generating a pacing parameter; and
a pacing pulse generator for generating pacing pulses for said heart in accordance with said pacing parameter;
wherein said pacing parameter generator includes a selector for adjusting said pacing parameter to maximize a cardiac output indicated by said evoked depolarization potential at different pacing rates.
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Abstract
The cardiac output of a paced heart is optimized by measuring a parameter indicative of the volume of blood in a heart chamber as a function of a pacing parameter. The pacing parameter is adjusted so that the heart pumps the maximum volume at different rates for hearts with debilitating pathologies. This pacing parameter is then used for controlling the pacing pulses for pacing the heart. Preferably the volume parameter is the paced depolarization integral and the pacing parameter is the A-V delay.
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Citations
17 Claims
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1. A pacemaker for regulating a patient'"'"'s heart, comprising:
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a measuring element for measuring an evoked depolarization potential indicative of the diastolic volume of blood in a chamber of the patient'"'"'s heart; a pacing parameter generator for generating a pacing parameter; and a pacing pulse generator for generating pacing pulses for said heart in accordance with said pacing parameter; wherein said pacing parameter generator includes a selector for adjusting said pacing parameter to maximize a cardiac output indicated by said evoked depolarization potential at different pacing rates. - View Dependent Claims (2, 3, 4, 5)
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6. A pacemaker for implantation in a patient'"'"'s body for regulating the patient'"'"'s heart, comprising:
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a sensor for sensing cardiac signals generated in a chamber of the patient'"'"'s heart, said cardiac signals including an evoked depolarization potential signal responsive to a pacing pulse; a pulse generator for applying pacing pulses to said chamber; a pacing parameter generator for generating a pacing parameter; a timer for timing said pacing pulses in accordance with said pacing parameter; and a volume parameter generator for determining a volume parameter from said evoked depolarization potential signal, said volume parameter being indicative of a diastolic volume of blood pumped by said chamber; and said pacing parameter generator including a selector for selecting said pacing parameter in accordance with said volume parameter to maximize a cardiac output indicated by said volume parameter. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A method of regulating a patient'"'"'s heart comprising the steps of:
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generating pacing pulses for said cardiac chamber; sensing cardiac signals from a cardiac chamber including evoked depolarization potential signals resulting from said pacing pulses; generating a volume parameter indicative of a diastolic volume of blood being pumped by said chamber in response to said pacing pulses, said volume parameter being derived from said evoked depolarization potential signals; and generating a pacing parameter selected to optimize said volume of blood as indicated by said volume parameter at different rates, said pacing parameter defining a characteristic of said pacing pulses. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification