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US 7,890,162 B2Granted
Method and apparatus for sensing improvement using pressure data
AssigneeMedtronic, Inc.
InventorsYong K. Cho, Teresa A. Whitman, Mark L. Brown, Scott W. Davie, Karen J. Kleckner, Charles R. Gordon
Life of this patent
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Abstract
Method and apparatus for sensing improvement using pressure data. The method and apparatus may be used in an implantable medical device to confirm that an EGM event signifies a true mechanical cardiac activity and not just electrical oversensing. The mechanical activity may be used to create a mechanical marker channel in the implantable medical device.
Claims6
A method of confirming that an EGM deflection represents an R-wave comprising:
- sensing an EGM via an implantable medical device (IMD);
- sensing an intracardiac pressure via the IMD;
- determining a dP/dt of the sensed intracardiac pressure;
- detecting an electrical event using the EGM;
- opening a time window after detecting the electrical event;
- determining a maximum positive dP/dt of the intracardiac pressure sensed during the open time window;
- detecting the presence of a mechanical event responsive to the maximum positive dP/dt being greater than a first threshold;
- and
- determining that the electrical event includes an R-wave responsive to the presence of the mechanical event;
- determining a minimum negative dP/dt of the intracardiac pressure sensed during the open time window;
- and
- detecting the presence of an oversensed T-wave or noise using the minimum negative dP/dt, the oversensed T-wave or noise being deemed present when the mechanical event is deemed absent and an absolute value of the minimum negative dP/dt is greater than a second threshold.
9 more elements
Dependencies are inferred from the claim text.