Pacesetter, Inc.

Elisabeth M Clem

Eric Steven Fain

Yongjian Wu

Anne M Shelchuk

Jianchun Yi

April C Pixley

Shohan T Hossain

Pajhand Iranitalab

Chris Pontiga

Lisa Malden

Embodiments of the present invention concern the timing of sending one or more commands to control circuitry of a multi-electrode lead (MEL). In one embodiment, the one or more commands are sent to control circuitry within the MEL during a predetermined portion of a cardiac pacing cycle to avoid potential problems of prior systems that were not synchronized with the cardiac pacing cycle. In one embodiment, the one or more commands are sent when cardiac tissue is refractory from a cardiac pacing pulse, to prevent the command(s) from potentially undesirably stimulating cardiac tissue. The command sending can occur such that the one or more commands are sent between instances when sensing circuitry of the implantable cardiac stimulation device is being used to obtain one or more signals indicative of cardiac electrical activity, to prevent interference between the one or more commands with the signals indicative of cardiac electrical activity that are sensed.

Systems and methods to synchronize commands sent to a multi-electrode lead (MEL) with a portion of a cardiac pacing cycle

In an arrhythmia discrimination algorithm a timer is used to trigger the delivery of therapy when no diagnosis is made within a defined time during a tachycardia episode. Where one or more rhythm discriminators or qualifiers such as morphology, sudden onset, interval stability and AV association is enabled, the timer starts as soon as a ventricular interval or interval average is faster than a programmed maximum time to diagnosis (MTD) cutoff. If the timer times out before the algorithm diagnoses a particular rhythm, a programmed therapy is delivered. In the preferred embodiment, the therapy that is triggered is a function of the most recent detected ventricular rate and the programmed MTD therapy.

Safety backup in arrhythmia discrimination algorithm

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Redwood City, CA, United States of America

Elisabeth M Clem