Similarity recovery post shock
First Claim
Patent Images
1. A method comprising:
- receiving a cardiac complex following an electric stimulation;
calculating a similarity metric based on the cardiac complex and a stored template;
calculating a trend metric based on the similarity metric and an earlier similarity metric; and
inhibiting therapy if the trend metric indicates that the cardiac complex is approaching the template.
1 Assignment
0 Petitions
Accused Products
Abstract
A cardiac rhythm management system adapted to administer therapy based on identification and analysis of a trend in a series of similarity metrics based on a comparison of a cardiac complex and a template at a time following an electrical stimulation. Where the trend indicates a monotonically increasing correlation, therapy is inhibited and otherwise, therapy is delivered. In one embodiment, analysis of the trend includes discarding spurious data, executing a smoothing function, and calculating a moving average.
-
Citations
48 Claims
-
1. A method comprising:
-
receiving a cardiac complex following an electric stimulation;
calculating a similarity metric based on the cardiac complex and a stored template;
calculating a trend metric based on the similarity metric and an earlier similarity metric; and
inhibiting therapy if the trend metric indicates that the cardiac complex is approaching the template. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A method comprising:
-
detecting an electrical stimulation;
receiving a first cardiac complex and a second cardiac complex after the electrical stimulation;
calculating a first similarity metric based on the first cardiac complex and a template;
calculating a second similarity metric based on the second cardiac complex and the template;
calculating a trend metric based on the first similarity metric and the second similarity metric; and
inhibiting therapy if the trend metric indicates a trend towards the template. - View Dependent Claims (16, 17, 18)
-
-
19. A method comprising:
-
receiving a template complex;
receiving a series of cardiac complexes occurring at a time following a first electrical stimulation;
calculating a series of similarity metrics wherein each similarity metric is determined based on a comparison of a cardiac complex of the series of cardiac complexes and the template complex;
calculating a series of trend metrics wherein each trend metric is determined based on a plurality of similarity metrics of the series of similarity metrics;
evaluating the series of trend metrics to determine if the series of cardiac complexes is trending towards the template complex; and
administering therapy based on the evaluating. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
-
-
32. A method comprising:
-
receiving a series of cardiac complexes at a time occurring after a first electrical stimulation and before a second electrical stimulation, the second electrical stimulation subsequent to the first electrical stimulation;
for a predetermined period of time following the first electrical stimulation, generating a series of correlation coefficients based on a comparison of the series of cardiac complexes and a stored template;
calculating a series of trend metrics for the series of correlation coefficients, each trend metric based on a plurality of correlation coefficients selected from the series of correlation coefficients; and
inhibiting delivery of the second electrical stimulation if a predetermined subset of the series of trend metrics indicates that the series of cardiac complexes is approaching the template. - View Dependent Claims (33, 34, 35, 36)
-
-
37. A system comprising:
-
a sensing means adapted to couple to a cardiac electrode means and adapted to detect a series of cardiac complexes;
a correlation analysis means coupled to the sensing means and adapted to generate a series of correlation coefficients based on the series of cardiac complexes and a template;
a trend analysis means coupled to the correlation analysis means and adapted to analyze a trend based on the series of correlation coefficients; and
a therapy delivery means coupled to the trend analysis means and adapted to deliver therapy based on a signal received from the trend analysis means. - View Dependent Claims (38, 39, 40)
-
-
41. A method comprising:
-
receiving a series of cardiac complexes at a time following an electrical stimulation;
generating a series of correlation coefficients, each correlation coefficient based on a comparison of a cardiac complex with a stored template;
evaluating a subset of the series of correlation coefficients to determine if a monotonically increasing trend exists; and
inhibiting therapy if the monotonically increasing trend exists. - View Dependent Claims (42, 43, 44, 45, 46, 47)
-
-
48. A method comprising:
-
receiving a cardiac complex following an electric stimulation;
calculating a similarity metric based on the cardiac complex and a stored template;
calculating a trend metric based on the similarity metric and an earlier similarity metric; and
storing data indicating that the cardiac complex corresponds to a tachycardia having an atrial origin if the trend metric indicates that the cardiac complex is approaching the template.
-
Specification