Beat-morphology matching scheme for cardiac sensing and event detection
AssigneeMedtronic, Inc.
InventorXusheng Zhang
Life of this patent
Estimating the term…
Abstract
A medical device and associated method for classifying an unknown cardiac signal operate to sense a cardiac signal over known cardiac cycles and generate a template of the known cardiac cycles. An unknown cardiac signal is sensed over an unknown cardiac cycle. A template alignment point and an unknown cardiac signal alignment point are identified by using a fourth order difference signal. The template and the unknown cardiac signal are aligned across an alignment window by aligning the template alignment point and the unknown cardiac signal alignment point. A morphology match metric measuring a similarity between the aligned template and the unknown cardiac signal is computed.
Claims21
A method for classifying cardiac beats for use in detecting cardiac rhythms, comprising:
- sensing a cardiac signal over a plurality of cardiac cycles using a plurality of electrodes coupled to a sensing module;
- determining a template of a known cardiac signal in response to the cardiac signal sensed over the plurality of cardiac cycles;
- sensing an unknown cardiac signal over an unknown cardiac cycle;
- determining a fourth order difference signal;
- determining a template alignment point and an unknown cardiac signal alignment point in response to the fourth order difference signal;
- aligning the template and the unknown cardiac signal across an alignment window by aligning the template alignment point and the unknown cardiac signal alignment point;
- determining a first morphology match metric between the aligned template and the unknown cardiac signal.
A medical device for classifying cardiac beats for use in detecting cardiac rhythms, comprising:
- a plurality of electrodes for sensing an electrocardiogram (ECG) signal;
- a sensing module coupled to the electrodes for sensing a cardiac signal over a plurality of cardiac cycles and an unknown cardiac signal over an unknown cardiac cycle;
- and
- a processor coupled to the sensing module and configured to:
- determine a template of a known cardiac signal in response to the cardiac signal sensed over the plurality of cardiac cycles;
- determine a template alignment point and an unknown cardiac signal alignment point, wherein determining the template alignment point and the unknown cardiac signal alignment point comprises determining a fourth order difference signal;
- align the template and the unknown cardiac signal across an alignment window by aligning the template alignment point and the unknown cardiac signal alignment point;
- and
- determine a first morphology match metric measuring a similarity between the aligned template and the unknown cardiac signal.
A non-transitory, computer-readable medium storing a set of instructions, which when executed by a processor of a medical device causes the device to:
- sense a cardiac signal over a plurality of cardiac cycles using a plurality of electrodes coupled to a sensing module;
- generate a template of a known cardiac signal in response to the cardiac signal sensed over the plurality of cardiac cycles;
- sense an unknown cardiac signal over an unknown cardiac cycle;
- determine a template alignment point and an unknown cardiac signal alignment point, wherein determining the template alignment point and the unknown cardiac signal alignment point comprises determining a fourth order difference signal;
- align the template and the unknown cardiac signal across an alignment window by aligning the template alignment point and the unknown cardiac signal alignment point;
- and
- determine a morphology match metric measuring a similarity between the aligned template and the unknown cardiac signal.
Dependencies are inferred from the claim text.