Trending of systolic murmur intensity for monitoring cardiac disease with implantable device
First Claim
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1. An implantable cardiac device, comprising:
- a pressure sensor adapted for disposition so as to sense the acoustic vibrations produced by a systolic murmur;
a bandpass filter for filtering the pressure signal;
a signal energy detector for measuring a parameter related to the signal energy of the filtered pressure signal to represent the murmur intensity;
a controller programmed to record a baseline murmur intensity; and
, wherein the controller is further programmed to measure a current murmur intensity as an average of intensity measurements taken over some period of time, compare the current murmur intensity to the baseline murmur intensity, and set an alarm flag if the current murmur intensity exceeds the baseline murmur intensity by a specified threshold amount.
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Abstract
Described is an implantable device configured to monitor for changes in the intensity and/or duration of a systolic murmur such as mitral regurgitation by means of an acoustic sensor. Such changes may be taken to indicate a change in a patient'"'"'s heart failure status. Upon detection of a worsening in the patient'"'"'s heart failure statue, the device may be programmed to alert clinical personnel over a patient management network and/or make appropriate adjustments to pacing therapy.
95 Citations
20 Claims
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1. An implantable cardiac device, comprising:
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a pressure sensor adapted for disposition so as to sense the acoustic vibrations produced by a systolic murmur;
a bandpass filter for filtering the pressure signal;
a signal energy detector for measuring a parameter related to the signal energy of the filtered pressure signal to represent the murmur intensity;
a controller programmed to record a baseline murmur intensity; and
,wherein the controller is further programmed to measure a current murmur intensity as an average of intensity measurements taken over some period of time, compare the current murmur intensity to the baseline murmur intensity, and set an alarm flag if the current murmur intensity exceeds the baseline murmur intensity by a specified threshold amount. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method, comprising:
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sensing the acoustic vibrations produced by a systolic murmur;
filtering the pressure signal;
measuring a parameter related to the signal energy of the filtered pressure signal to represent the murmur intensity;
recording a baseline murmur intensity; and
,measuring a current murmur intensity as an average of intensity measurements taken over some period of time, comparing the current murmur intensity to the baseline murmur intensity, and setting an alarm flag if the current murmur intensity exceeds the baseline murmur intensity by a specified threshold amount. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification