Methods for the determination of T-shock vulnerable window from far-field electrograms in implantable cardioverter defibrillators
AssigneesMedtronic, Inc., Imperception, Inc.
InventorsPaul A. Belk, Jian Cao, Jeffrey M. Gillberg, Charles D. Swerdlow
Life of this patent
Estimating the term…
Abstract
Methods for determination of timing for electrical shocks to the heart to determine shock strength necessary to defibrillate a fibrillating heart. The timing corresponds the window of most vulnerability in the heart, which occurs during the T-wave of a heartbeat. Using a derivatized T-wave representation, the timing of most vulnerability is determined by a center of the area method, peak amplitude method, width method, or other similar methods. Devices are similarly disclosed embodying the methods of the present disclosure.
Claims7
A method comprising:
- obtaining a derivatized electrogram (EGM) of far-field data for a set of heartbeats for a heart via an implantable medical device;
- determining a T-window for each heart heartbeat via the implantable medical device;
- and
- determining a most vulnerable moment (QTp) of the heart for each heartbeat via the implantable medical device by calculating the center of the area of the derivatized EGM for the T-window.
An implantable medical device configured to:
- provide ventricular pacing pulses;
- and
- determine a period of vulnerability for delivering electrical shocks to a heart via the implantable medical device;
- wherein the implantable medical device is further configured to determine the period of vulnerability by:
- obtaining a derivatized electrogram (EGM) of far-field data for a set of heartbeats for the heart;
- determining a T-window for each heartbeat of the heart;
- and
- determining a most vulnerable moment (QTp) of the heart for each heartbeat by calculating the center of the area of the derivatized EGM for the T-window.
Dependencies are inferred from the claim text.