Cardiac rhythm management system with maximum tracking rate (MTR) hysteresis
0 Assignments
0 Petitions
Accused Products
Abstract
A cardiac rhythm management system provides both a safe maximum pacing rate limit and a physiological maximum pacing rate limit. In one embodiment, a normal maximum tracking rate (MTR) and a hysteresis MTR are provided. The hysteresis MTR is set higher than the normal MTR and functions as a maximum pacing rate. When an atrial rate exceeds the hysteresis MTR limit, the maximum pacing rate limit is set to the normal MTR. Once the atrial rate falls below a predetermined threshold, the maximum pacing rate limit is set to the hysteresis MTR. This provides for a more rapid and natural maximum pacing rate limit for a patient, while still protecting the patient from being paced at abnormally high rates.
39 Citations
45 Claims
-
1-16. -16. (canceled)
-
17. A method, including:
-
sensing a first cardiac signal from an atrial location;
detecting atrial depolarizations from the first cardiac signal;
determining a heart rate based on the atrial depolarizations;
comparing the heart rate to a first predetermined value and a second predetermined value, the second value larger than the first value;
setting a maximum ventricular pacing rate to the first predetermined value when the heart rate exceeds the second predetermined value; and
setting the maximum ventricular pacing rate to the second predetermined value when the heart rate falls below a predetermined threshold. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
-
-
33. A method, including:
-
sensing a first cardiac signal from a ventricular location;
detecting ventricular depolarizations from the first cardiac signal;
determining a heart rate based on the ventricular depolarizations;
comparing the heart rate to a first predetermined value and a second predetermined value, the second value larger than the first value;
setting a maximum atrial pacing rate to the first predetermined value when the heart rate exceeds the second predetermined value; and
setting the maximum atrial pacing rate to the second predetermined value when the heart rate falls below a predetermined threshold. - View Dependent Claims (34, 35)
-
-
36. A method, including:
-
sensing a first cardiac signal from an atrial location;
detecting atrial depolarizations from the first cardiac signal;
determining a heart rate based on the atrial depolarizations;
comparing the heart rate to a first predetermined value and a second predetermined value, the second value larger than the first value;
setting a maximum atrial pacing rate to the first predetermined value when the heart rate exceeds the second predetermined value; and
setting the maximum atrial pacing rate to the second predetermined value when the heart rate falls below a predetermined threshold. - View Dependent Claims (37, 38)
-
-
39. A cardiac rhythm management system, including:
-
a first lead adapted to sense a first cardiac signal in or about an atrium of a heart;
a first sensing circuit, coupled to the first lead, including;
a first sense amplifier, coupled to the first lead, to receive the first cardiac signal; and
a first cardiac depolarization detector, coupled to the first sense amplifier, to detect atrial depolarizations in the first cardiac signal;
a controller, coupled to the first sensing circuit, including;
a rate detector, coupled to the first cardiac depolarization detector, to determine a heart rate from detected atrial depolarizations, a comparator, coupled to the rate detector, including inputs representative of the heart rate and at least one of a first predetermined value, a second predetermined value, and a predetermined threshold and one or more outputs representative of whether the heart rate exceeds the second predetermined value and whether heart rate falls below the predetermined threshold;
a storage medium, coupled to the comparator, including the first predetermined value, the second predetermined value, and the predetermined threshold; and
a pacing algorithm module, coupled to the comparator, to set a maximum ventricular pacing rate to the first predetermined value when the heart rate exceeds the second predetermined value, and set the maximum ventricular pacing rate to the second predetermined value when the heart rate falls below a predetermined threshold. - View Dependent Claims (40, 41, 42, 43, 44)
-
-
45-50. -50. (canceled)
Specification