Medtronic, Inc.

Gary J Syring

John C Rueter

Harold Toby Markowitz

A pacing system analyzer as connected to an implantable cardiac pacer and if an atrial pacing pulse is detected only, the analyzer sends a simulated P-wave to the pacer and determines the response of the simulated P-wave to determine if the pacing mode is AAI, AAT, or AOO. In the event a ventricular output pulse only is detected by the analyzer, a simulated R-wave is sent to the pacer and if the pacer responds either by a triggered ventricular pulse or by not changing its response, the analyzer determines that the pacer is in a VVT or VOO mode. On the other hand, if the pacer is inhibited a subsequent simulated P-wave is sent to it and the response of this P-wave determines whether or not the pacer is in a VVI or VDD mode. In the event that both atrial and ventricular pacing pulses are detected by the analyzer, the simulated R-wave is first sent to the pacer and an unchanged response determines that the pacer is in a DOO mode. On the other hand, if the pacer is inhibited so that ventricular pulses are not produced, then a simulated P-wave is sent to it. The response of the pacer to the simulated P-wave determines whether it is in a DVI or DDD mode.

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Minneapolis, MN, United States of America

Gary J Syring