METHOD AND APPARATUS TO DELIVER MECHANICALLY FUSED PACING THERAPY
First Claim
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1. A medical device system for delivering mechanically fused left ventricular cardiac stimulation, said system comprising:
- an implantable medical device (IMD);
a plurality of electrical medical leads coupled to the IMD and adapted to deliver left ventricular stimulation to a patient upon expiration of an AV interval; and
at least one sensor capable of monitoring left ventricular motion and providing a left ventricular motion signal to the IMD, the IMD determining a mechanical response interval based on the left ventricular motion signal, the IMD adjusting the AV interval after determining that the mechanical response interval differs from a predetermined desired mechanical response interval in order to deliver mechanically-fused left ventricular cardiac stimulation.
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Abstract
A medical device system and method for delivering mechanically fused left ventricular cardiac stimulation. A sensor monitors left ventricular acceleration while left ventricular cardiac stimulation is provided at an AV interval. The left ventricular acceleration is used to calculate a mechanical response interval and the mechanical response interval is compared to a desired mechanical response interval. The AV interval is adjusted until the mechanical response interval is equal to the desired mechanical response interval.
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Citations
14 Claims
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1. A medical device system for delivering mechanically fused left ventricular cardiac stimulation, said system comprising:
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an implantable medical device (IMD); a plurality of electrical medical leads coupled to the IMD and adapted to deliver left ventricular stimulation to a patient upon expiration of an AV interval; and at least one sensor capable of monitoring left ventricular motion and providing a left ventricular motion signal to the IMD, the IMD determining a mechanical response interval based on the left ventricular motion signal, the IMD adjusting the AV interval after determining that the mechanical response interval differs from a predetermined desired mechanical response interval in order to deliver mechanically-fused left ventricular cardiac stimulation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of providing mechanically fused left ventricular cardiac stimulation, comprising:
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delivering a left ventricular cardiac stimulation to a patient at a long AV interval; monitoring a left ventricular acceleration signal; monitoring right ventricular pressure (P) to produce a right ventricular P signal; detecting a valve opening using at least one of the left ventricular acceleration signal and the right ventricular P signal; calculating a mechanical response interval at the long AV interval based on the at least one of the left ventricular acceleration signal; delivering a left ventricular cardiac stimulation to a patient at a short AV interval; monitoring a left ventricular acceleration signal; monitoring right ventricular pressure (P) to produce a right ventricular P signal; detecting a valve opening using at least one of the left ventricular acceleration signal and the right ventricular P signal; calculating a mechanical response interval at the short AV interval based on the at least one of the left ventricular acceleration signal; calculating a desired mechanical response interval as a function of the mechanical response interval at the long AV interval and the mechanical response interval at the short AV interval; and adjusting the AV interval until a measured mechanical response interval equals the desired mechanical response interval. - View Dependent Claims (14)
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Specification