RATE INITIALIZATION AND OVERDRIVE PACING FOR CAPTURE THRESHOLD TESTING

摘要

Approaches for rate initialization and overdrive pacing used during capture threshold testing are described. Cardiac cycles are detected and the cardiac events of a cardiac chamber that occur during the cardiac cycles are monitored. The number of intrinsic beats in the cardiac events is counted. Initialization for a capture threshold test involves maintaining a pre-test pacing rate for the capture threshold test if the number of intrinsic beats in the cardiac events is less than a threshold. The pacing rate is increased for the capture threshold test if the number of intrinsic beats in the cardiac events is greater than the threshold.

主权项

1. A method of operating a cardiac device, comprising:
delivering pacing pulses to one or more electrodes that are coupleable to a cardiac chamber of a heart at a first pacing rate, and counting a number of intrinsic and/or fusion beats over a plurality of cardiac cycles; after the counting step, initializing a capture threshold test (CTT) including setting a capture threshold test (CTT) pacing rate, wherein the capture threshold test (CTT) pacing rate is set to a second pacing rate that is higher than the first pacing rate if the number of counted intrinsic and/or fusion beats over the plurality of cardiac cycles reaches a predetermined threshold; and executing the capture threshold test (CTT) using the initialized capture threshold test (CTT) pacing rate.