Atrial arrhythmia episode detection in a cardiac medical device
First Claim
1. A method of detecting an atrial tachyarrhythmia in a medical device, comprising:
- sensing a first cardiac electrical signal from a first sensing electrode vector;
identifying R-waves in the first cardiac electrical signal attendant ventricular depolarizations;
determining RR intervals between successive R-waves in the first cardiac electrical signal;
determining classification factors from the R-waves identified over a first predetermined time period by determining at least a first classification factor correlated to variability of the RR intervals and a second classification factor indicating a presence of a ventricular tachyarrhythmia;
classifying the first predetermined time period as one of unclassified, atrial tachyarrhythmia and non-atrial tachyarrhythmia by comparing the determined classification factors to classification criteria, wherein the first predetermined time period is classified as unclassified in response to the second classification factor indicating the presence of a ventricular tachyarrhythmia;
detecting an atrial tachyarrhythmia episode in response to the first time period being classified as unclassified and at least one preceding time period and at least one subsequent time period being classified as atrial tachyarrhythmia; and
in response to detecting the atrial tachyarrhythmia episode, storing episode data determined from at least the first cardiac electrical signal in a memory of the medical device for transmission to an external device.
1 Assignment
0 Petitions
Accused Products
Abstract
A medical device performs a method for detecting an atrial tachyarrhythmia by determining RR intervals between successive R-waves of a cardiac electrical signal and determining classification factors from the R-waves identified over a predetermined time period by determining at least a first classification factor correlated to variability of the RR intervals and a second classification factor indicating a presence of a ventricular tachyarrhythmia. The device classifies the cardiac electrical signal of the predetermined time period as unclassified, atrial tachyarrhythmia or non-atrial tachyarrhythmia by comparing the determined classification factors to classification criteria. The predetermined time period is classified as unclassified when the second classification factor indicates the presence of a ventricular tachyarrhythmia.
149 Citations
24 Claims
-
1. A method of detecting an atrial tachyarrhythmia in a medical device, comprising:
-
sensing a first cardiac electrical signal from a first sensing electrode vector; identifying R-waves in the first cardiac electrical signal attendant ventricular depolarizations; determining RR intervals between successive R-waves in the first cardiac electrical signal; determining classification factors from the R-waves identified over a first predetermined time period by determining at least a first classification factor correlated to variability of the RR intervals and a second classification factor indicating a presence of a ventricular tachyarrhythmia; classifying the first predetermined time period as one of unclassified, atrial tachyarrhythmia and non-atrial tachyarrhythmia by comparing the determined classification factors to classification criteria, wherein the first predetermined time period is classified as unclassified in response to the second classification factor indicating the presence of a ventricular tachyarrhythmia; detecting an atrial tachyarrhythmia episode in response to the first time period being classified as unclassified and at least one preceding time period and at least one subsequent time period being classified as atrial tachyarrhythmia; and in response to detecting the atrial tachyarrhythmia episode, storing episode data determined from at least the first cardiac electrical signal in a memory of the medical device for transmission to an external device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 16, 17)
-
-
11. A medical device system for detecting an atrial tachyarrhythmia, comprising:
-
sensing circuitry configured to sense a first cardiac electrical signal from a first sensing electrode vector; a processor; and memory accessible by the processor, the processor configured to; identify R-waves in the first cardiac electrical signal attendant ventricular depolarizations; determine RR intervals between successive R-waves in the first cardiac electrical signal; determine classification factors from the R-waves identified over a first predetermined time period by determining at least a first classification factor correlated to variability of the RR intervals and a second classification factor indicating a presence of a ventricular tachyarrhythmia; classify the first predetermined time period as one of unclassified, atrial tachyarrhythmia and non-atrial tachyarrhythmia by comparing the determined classification factors to classification criteria, wherein the first predetermined time period is classified as unclassified in response to the second classification factor indicating the presence of a ventricular tachyarrhythmia; detect an atrial tachyarrhythmia episode in response to the first time period being classified as unclassified and at least one preceding time period and at least one subsequent time period being classified as atrial tachyarrhythmia; and in response to detecting the atrial tachyarrhythmia episode, storing episode data determined from at least the first cardiac electrical signal in the memory for transmission to an external device. - View Dependent Claims (12, 13, 14, 15, 18, 19, 20, 21, 22, 23)
-
-
24. A non-transitory, computer-readable storage medium storing instructions for causing a processor, upon executing the instructions, to:
-
sense a first cardiac electrical signal from a first sensing electrode vector; identify R-waves in the first cardiac electrical signal attendant ventricular depolarizations; determine RR intervals between successive R-waves in the first cardiac electrical signal; determine classification factors from the R-waves identified over a first predetermined time period by determining at least a first classification factor correlated to variability of the RR intervals and a second classification factor indicating a presence of a ventricular tachyarrhythmia; classify the first predetermined time period as one of unclassified, atrial tachyarrhythmia and non-atrial tachyarrhythmia by comparing the determined classification factors to classification criteria, wherein the first predetermined time period is classified as unclassified in response to the second classification factor indicating the presence of a ventricular tachyarrhythmia; detect an atrial tachyarrhythmia episode in response to the first time period being classified as unclassified and at least one preceding time period and at least one subsequent time period being classified as atrial tachyarrhythmia; and in response to detecting the atrial tachyarrhythmia episode, store episode data determined from at least the first cardiac electrical signal in a memory of the medical device for transmission to an external device.
-
Specification