Autocapture pacing/sensing configuration
First Claim
1. A method for operating a cardiac rhythm management device, comprising:
- switchably connecting at least two electrodes disposed in an atrium or a ventricle to the inputs of a sense amplifier;
delivering an electrical stimulus to the atrium or ventricle through a coupling capacitance wherein the electrical stimulus is delivered between at least one of the electrodes connected to the sense amplifier and a housing of the device;
attenuating afterpotentials resulting from the delivered electrical stimulus by reducing the coupling capacitance; and
,sensing an evoked response to the electrical stimulus from the output of the sense amplifier.
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Abstract
A cardiac electrical stimulation system that enhances the ability of the system to automatically detect whether an electrical stimulus results in heart capture or contraction. The cardiac electrical stimulation system may be utilized, for example, as a cardiac pacer or as a cardioverter defibrillator. The cardiac electrical stimulation system includes an electrical stimulation circuit that attenuates polarization voltages or “afterpotential” which develop at the heart tissue/electrode interface following the delivery of a stimulus to the heart tissue, which thereby allows the stimulation electrodes to be utilized to sense an evoked response to the electrical stimulus. The cardiac electrical stimulation system utilizes the stimulation electrodes to sense an evoked response, thereby eliminating the necessity for an indifferent electrode to sense an evoked response. The present invention allows accurate detection of an evoked response of the heart, to thereby determine whether each electrical stimulus results in capture.
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Citations
20 Claims
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1. A method for operating a cardiac rhythm management device, comprising:
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switchably connecting at least two electrodes disposed in an atrium or a ventricle to the inputs of a sense amplifier; delivering an electrical stimulus to the atrium or ventricle through a coupling capacitance wherein the electrical stimulus is delivered between at least one of the electrodes connected to the sense amplifier and a housing of the device; attenuating afterpotentials resulting from the delivered electrical stimulus by reducing the coupling capacitance; and
,sensing an evoked response to the electrical stimulus from the output of the sense amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification