System for ischemia detection based on adjustable paced beat analysis timing

摘要

A device for detecting cardiac ischemia is disclosed. The device includes a processor that is configured to distinguish between ventricularly paced beats and supraventricular beats. The processor applies different ischemia tests to the two different beat types, and generates alert when it detects ischemia. The processor collects and counts the ST segment deviation values for ventricularly paced beats for a pre-set time period. The processor then determines if the number of ventricularly paced beats is insufficient to perform ischemia detection. If so, then the processor collects ST deviation values for additional paced beats. When the processor determines that a sufficient number of ventricularly paced beats have been acquired, it identifies ischemic beats by the application of ischemia detection criteria to the ST deviation values of the collected ventricularly paced beats.

主权项

1. An implantable device with ischemia detection and heart pacing capability, including:
at least one electrode adapted for implantation in a body; data acquisition circuitry coupled to the electrode to sense signals therefrom and to generate corresponding digital signals; pacemaker circuitry; a processor configured to: distinguish between at least two beat types, including ventricularly paced and supraventricular beats; collect the values of a heart signal parameter from the digital signals for ventricularly paced beats for a pre-set time period; count the number of ventricularly paced beats for which heart signal parameter values have been collected; determine if the number of ventricularly paced beats during the pre-set time period for which heart signal parameter values have been collected is insufficient to perform ischemia detection, and if the number is insufficient, collect values of the heart signal parameter for additional paced beats; operative upon heart signal parameter values for a sufficient number of ventricularly paced beats being acquired, identify ischemic beats by the application of ischemia detection criteria to the values of the heart signal parameter for ventricularly paced beats.