Patent ID: 8923965
Filing Date: 2014-12-30
Classification: A61N

Abstract:
1. A method for controlling ventricular pacing within a patient for use by an implantable medical device, the method comprising: detecting intracardiac electrogram (IEGM) signals within the patient using electrodes; determining preliminary IEGM-based atrioventricular and interventricular pacing delays using the IEGM signals; detecting an impedance (Z) signal along a vector influenced by stroke volume within the patient; adjusting the preliminary IEGM-based atrioventricular and interventricular pacing delays based on the impedance signal to yield impedance-based atrioventricular and interventricular pacing delays; controlling the delivering of ventricular pacing using the impedance-based atrioventricular and interventricular pacing delays; wherein the device includes left ventricular (LV) and right ventricular (RV) leads and wherein detecting IEGM signals includes detecting LV IEGM and RV IEGM signals; wherein determining preliminary IEGM-based atrioventricular (AV) pacing delays comprises: determining intrinsic conduction delays (AR and PR) to the RV and LV leads, wherein AR and PR represent atrio-ventricular delays for stimulated and spontaneous atrial depolarization, respectively; determining an intra-atrial conduction delay (IACD); determining a preferred IEGM-based PV delay (IEGM PV) using IEGM PV=IACD+an offset, wherein PV delay represents a delay between an intrinsic P-wave and a ventricular stimulation pulse; and determining a preferred IEGM-based AV delay (IEGM AV) using IEGM AV=IEGM PV+AR−PR.