Implantable medical device with real time T-wave oversensing detection
AssigneeMedtronic, Inc.
InventorsBruce Gunderson, Amisha Patel, Chad Bounds
Life of this patent
Estimating the term…
Abstract
An implantable cardioverter defibrillator (ICD) senses ventricular depolarizations (R-waves) in an electrogram signal to detect a ventricular tachycardia or fibrillation episodes. The EGM signal is also monitored in real time for characteristics that uniquely identify instances of T-wave oversensing. The ICD determines whether detection of a tachycardia or fibrillation episode is appropriate based upon counts of each of the unique characteristics evidencing T-wave oversensing.
Claims21
A method of controlling VT and VF detection in an implantable medical device, the method comprising:
- sensing R-waves in a ventricular EGM signal;
- monitoring in real time on an event-by-event basis a plurality of characteristics that indicate T-wave oversensing;
- and
- withholding detection of a VT or VF in response to the characteristics indicating presence of oversensed T-waves among the sensed R-waves.
An implantable medical device comprising:
- at least one sensing electrode to sense an EGM signal from a heart of a patient;
- a sense circuit for sensing events representing R-waves in the EGM signal;
- and
- a processor to identify T-wave oversensing by the implantable medical device based on counts of T-wave oversensing characteristics that are updated with each sensed event.
A computer-implemented system for detecting ventricular tachycardia and ventricular fibrillation, the system comprising:
- means for operating an implantable medical device in accordance with sensed ventricular events for a plurality of cardiac cycles;
- means for identifying a plurality of characteristics of T-waves oversensing by the implantable medical device;
- means for updating counts of the characteristics with each sensed event;
- and
- means for automatically withholding detection of a ventricular tachycardia or ventricular fibrillation if the counts indicate T-wave oversensing.
Dependencies are inferred from the claim text.