Forced deceleration algorithm for synchronization of atrial cardioversion shock and technique for the implementation
First Claim
1. A method of atrial cardioversion/defibrillation comprising:
- measuring R-R intervals and R-waves to determine a mean ventricular interval;
using said mean as a reference to a percent of decrementation for a paced interval;
delivering, a ventricular pacing output pulse at the end of a decremented escape interval;
initiating a blanking period;
initiating an abort and reset period upon termination of a blanking period;
beginning a shock synchronization period upon expiration of the abort and reset period; and
delivering an atrial cardioversion/defibrillation pulse.
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Abstract
Primarily, the invention relates to a safe delivery of atrial cardioversion pulses in complex cardiac therapy environments wherein cardiac events suggest, for example, rapid ventricular rates that would prevent a safe atrial cardioversion. The invention generally utilizes an algorithmic system in which a resultant R-R interval encountered subsequent to the delivery of a ventricular pacing pulse is decrementally scanned until an R-R interval is found that will yield a reliable sustained R-R interval. The sustenance of the R-R interval prolongation enables ventricular deceleration. Strategically selected timing windows are used to trigger a device response that is proper and tailored to the ventricular event detected during and within the timing windows. Further, the invention enables an atrial cardioversion synchronization method that allows for the safe delivery of atrial cardioversion pulses in the presence of very rapid ventricular rates.
28 Citations
12 Claims
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1. A method of atrial cardioversion/defibrillation comprising:
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measuring R-R intervals and R-waves to determine a mean ventricular interval; using said mean as a reference to a percent of decrementation for a paced interval; delivering, a ventricular pacing output pulse at the end of a decremented escape interval; initiating a blanking period; initiating an abort and reset period upon termination of a blanking period; beginning a shock synchronization period upon expiration of the abort and reset period; and delivering an atrial cardioversion/defibrillation pulse. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification