System and method for automatically verifying capture during multi-chamber stimulation
First Claim
1. A cardiac stimulation device comprising:
- a pulse generator that selectively generates stimulation pulses for delivery to a pair of opposite chambers of a patient'"'"'s heart;
a detector that detects intracardiac electrogram (IEGM) signals of the selected pair of chambers subsequent to the delivery of the stimulation pulses; and
a controller, coupled to the detector and the pulse generator, that is operative to compare the detected IEGM signals with stored data to distinguish between no capture occurring in either chamber, capture occurring in only one of the selected chambers, and capture occurring in both of the selected chambers.
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Abstract
A system and corresponding method are provided to reliably detect capture during multi-chamber stimulation, and to further monitor the progression of congestive heart failure. The system provides a method by which intracardiac electrogram (IEGM) characteristics representing single-chamber capture and bi-ventricular capture are stored in memory and displayed. The annotation of the displayed waveforms is such that events associated with loss of capture, single-chamber capture, and bi-ventricular capture are clearly marked for ready interpretation by the physician. In a first situation, a stimulation pulse is followed by a time delay window and a subsequent depolarization complex that represents intrinsic responses of the chambers that have not been captured. In a second situation, a stimulation pulse is followed almost immediately by an evoked response that represents capture of one chamber, and a subsequent depolarization complex that represents an intrinsic response of one chamber that has not been captured. In a third situation, a stimulation pulse is almost immediately followed by an evoked response that represents simultaneous capture of two chambers.
214 Citations
11 Claims
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1. A cardiac stimulation device comprising:
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a pulse generator that selectively generates stimulation pulses for delivery to a pair of opposite chambers of a patient'"'"'s heart;
a detector that detects intracardiac electrogram (IEGM) signals of the selected pair of chambers subsequent to the delivery of the stimulation pulses; and
a controller, coupled to the detector and the pulse generator, that is operative to compare the detected IEGM signals with stored data to distinguish between no capture occurring in either chamber, capture occurring in only one of the selected chambers, and capture occurring in both of the selected chambers. - View Dependent Claims (2, 3, 4, 5)
a template representation of an overall intra-cardiac electrogram (IEGM) waveform;
a peak negative amplitude;
a peak positive amplitude;
a positive slope;
a negative slope;
a positive integral;
a negative integral;
a plurality of inflection points;
an average time duration of a plurality of depolarizations;
a time interval between a stimulation pulse and any subsequently detected event;
ora time interval between consecutively detected events.
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6. A method comprising:
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storing capture data corresponding to expected waveforms resulting from at least one of non-capture, single chamber capture, and bi-chamber capture;
stimulating two chambers of a heart, where the two chambers comprise one of both atria and both ventricles;
detecting a corresponding intracardiac electrogram (IEGM) signal; and
comparing the IEGM signal with the stored capture data to determine whether the IEGM signal corresponds with the stored capture data. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification