Cardiac resynchronization with adaptive A1-A2 and/or V1-V2 intervals
AssigneeMedtronic, Inc.
InventorsChester Struble, Pierre A. Grandjean
Life of this patent
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Abstract
In a system that provides bi-atrial and/or bi-ventricular pacing, the system adjusts an interval between paces delivered to the atria, and/or an interval between paces delivered to the ventricles, as a function of pressure data from the heart. In an exemplary embodiment, the system uses the pressure data from the ventricles to identify the times that each ventricle begins ejection of blood. The system may adjust the interval between paces to cause the ventricles to begin ejection at the same time, or to cause one ventricle to commence blood ejection prior to the other ventricle with a desired time offset. The system may further adjust the interval in response to changing conditions, such as a changing heart rate.
Claims63
An implantable medical device system comprising:
- a pulse generator that delivers a first pacing pulse to a first ventricle and a second pacing pulse to a second ventricle following a pacing interval;
- a pressure monitor that monitors a pressure in the first ventricle and a pressure in the second ventricle;
- and
- a processor that adjusts the pacing interval as a function of the pressure in the first ventricle and the pressure in the second ventricle.
A method comprising:
- identifying a first time when a first ventricle of a heart commences ejection of blood in response to a first pacing pulse;
- identifying a second time when a second ventricle of the heart commences ejection of blood in response to a second pacing pulse;
- setting a pacing interval as function of the first time and the second time.
A computer-readable medium comprising instructions that cause a processor to:
- identify a first time when a first ventricle of a heart commences ejection of blood in response to a first pacing pulse;
- identify a second time when a second ventricle of the heart commences ejection of blood in response to a second pacing pulse;
- set a pacing interval as function of the first time and the second time.
An implantable medical device system comprising:
- a pulse generator that delivers a first pacing pulse to a first atrium and a second pacing pulse to a second atrium following a pacing interval;
- a pressure monitor that monitors a pressure in a first cardiac chamber and a pressure in a second cardiac chamber;
- and
- a processor that adjusts the pacing interval as a function of the pressure in the first cardiac chamber and the pressure in the second cardiac chamber.
A method comprising:
- identifying a first time when a first atrium of a heart contracts in response to a first pacing pulse;
- identifying a second time when a second atrium of the heart contracts in response to a second pacing pulse;
- setting a pacing interval as function of the first time and the second time.
An implantable medical device system comprising:
- means for delivering pacing pulses to two complementary cardiac chambers of a heart, wherein complementary cardiac chambers comprise one of two ventricles and two atria, and wherein the pacing pulses are separated by an interval;
- means for monitoring the pressure in each of the complementary cardiac chambers;
- and
- means for adjusting the interval as a function of the monitored pressures.
An implantable medical device comprising:
- a pulse generator that applies a first pacing pulse to a first ventricle of a heart and a second pacing pulse to a second ventricle of a heart following an interval;
- a controller that controls the pulse generator to deliver the first pacing pulse and the second pacing pulse following the interval, wherein the interval is a function of a first pressure in the first ventricle and a second pressure in the second ventricle.
Dependencies are inferred from the claim text.