Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1993-05-11
1995-05-23
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
A61N 136
Patent
active
054177146
ABSTRACT:
A dual-chamber pacemaker provides DDI pacing with PVC-protected hysteresis and automatic AV interval adjustment. An extended hysteresis atrial escape interval (AEI.sub.H) is invoked in response to the occurrence of either an atrial paced event followed by a sensed R-wave (an AR event), or an atrial sensed event followed by a sensed R-wave (a PR event). The occurrence of a premature ventricular contraction (PVC) thus does not trigger AEI.sub.H. In one embodiment, AEI.sub.H is not invoked unless the sensed AR or PR interval exceeds a prescribed reference interval. In a further embodiment, the AV interval (AVI) associated with the DDI operation is automatically shortened following an atrial stimulation pulse (A-pulse) delivered upon the timing-out of the AEI.sub.H. The shortened AVI is maintained for a programmed number of cycles of DDI operation, after which a lengthened AVI is reestablished for one cycle. If AV pacing follows after using the lengthened AVI, then the shortened AVI is reinstated for a second number of programmed cycles of DDI operation. If AR pacing follows after using the lengthened AVI, signifying intact AV nodal conduction, then the AVI is lengthened to the programmed AVI over a prescribed number of cycles.
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Clarke Malcolm
Levine Paul A.
Poore John W.
Sholder Jason A.
Kamm William E.
Katz Samuel M.
Pacesetter Inc.
Parker Marianne
Romano Malcolm J.
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