Implantable cardiac stimulation system and method for measuring atrioventricular conduction and adjusting atrioventricular hysteresis
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United States of America Patent
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Sep 14, 2004
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app pub date -
Sep 12, 2001
filing date -
Sep 12, 2001
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Abstract
An implantable cardiac stimulation device and method measure atrioventricular conduction time and automatically adjust a positive hysteresis interval, for example AV hysteresis or PV hysteresis, to be applied to an AV interval or PV interval during atrial stimulation or atrial sensing, respectively. To measure atrioventricular conduction time during ventricular stimulation, the AV or PV interval is increased until R-wave sensing occurs. The AV or PV interval value at which R-wave sensing occurs is stored in memory as the atrioventricular conduction time. This atrioventricular conduction time is used to calculate a positive hysteresis value by subtracting the programmed AV or PV interval from the conduction time and adding a safety margin. Atrioventricular conduction time measurements are repeated periodically, with or without automatic adjustment of positive hysteresis intervals, and results are stored with time and date information for later display for diagnostic purposes.
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