Optimization of pacing parameters based on measurement of integrated acoustic noise
First Claim
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1. Apparatus for optimizing a pacing mode of a cardiac rhythm management device, comprising:
- (a) an implantable cardiac rhythm management device for producing cardiac stimulating pulses at timed intervals having a plurality of programmable parameters, wherein the implantable device has a plurality of different pacing modes and wherein different parameters are used for different pacing modes;
(b) means for applying said pulses to cardiac tissue at least one site to stimulate the heart;
(c) means for measuring acoustic noise over predetermined portions of a cardiac cycle during successive cardiac cycles;
(d) means for integrating the measured acoustic noise over the predetermined portions of the cardiac cycle;
(e) means for varying the programmable parameters of the cardiac rhythm management device in one pacing mode and for varing different programmable parameters in at least one other pacing mode;
(f) means for detecting one of a minimum integrated acoustic noise measurement and maximum ratio of integrated acoustic noise as said parameters are varied for use in different pacing modes; and
(g) means for setting the pacing mode of the cardiac rhythm management device to the parameters associated with said one of the minimum integrated acoustic noise measurement and maximum ratio of integrated acoustic noise measurements to supply pulses to stimulate the heart.
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Abstract
Hemodynamic performance of the heart as a pump is optimized by using an accelerometer and signal processing circuitry to measure total acoustic noise (TAN) over predetermined time periods when a pacemaker is made to function in a variety of modes. By detecting the particular mode associated with minimum TAN, the optimum pacing mode is arrived at.
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12 Claims
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1. Apparatus for optimizing a pacing mode of a cardiac rhythm management device, comprising:
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(a) an implantable cardiac rhythm management device for producing cardiac stimulating pulses at timed intervals having a plurality of programmable parameters, wherein the implantable device has a plurality of different pacing modes and wherein different parameters are used for different pacing modes; (b) means for applying said pulses to cardiac tissue at least one site to stimulate the heart; (c) means for measuring acoustic noise over predetermined portions of a cardiac cycle during successive cardiac cycles; (d) means for integrating the measured acoustic noise over the predetermined portions of the cardiac cycle; (e) means for varying the programmable parameters of the cardiac rhythm management device in one pacing mode and for varing different programmable parameters in at least one other pacing mode; (f) means for detecting one of a minimum integrated acoustic noise measurement and maximum ratio of integrated acoustic noise as said parameters are varied for use in different pacing modes; and (g) means for setting the pacing mode of the cardiac rhythm management device to the parameters associated with said one of the minimum integrated acoustic noise measurement and maximum ratio of integrated acoustic noise measurements to supply pulses to stimulate the heart. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification