Apparatus and method for diagnosis of cardiac disease using a respiration monitor
First Claim
1. A cardiac monitoring apparatus that monitors the cardiac condition of a patient comprising:
- a respiration sensor adapted to sense the respiration of the patient and generating corresponding respiration signal;
an analyzer that analyzes said respiration signals to determine a long term behavior of said respiration signals, and generates a respiration variability signal when said behavior conforms to predetermined criteria indicative of the respiration variability; and
an output device receiving said respiration variability signal and generating an output signal based on said respiration variability signal and indicative of a congestive heart failure status of said patient.
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Abstract
The cardiac condition of a patient is determined by a cardiac monitor apparatus using a respiration parameter such as a current respiration signal or a respiration rate. The variability of the respiration parameter is used to generate a signal indicative of the current heart failure status of the patient, and more particularly whether the patient'"'"'s condition has improved, worsened, or remained unchanged over a predetermined time period. The circuitry for detecting the respiration parameter may be implanted in the patient, for example as part of a pacemaker, while at least some of the analyzing circuitry may be external and remote from the patient. Alternatively the whole device may be implantable.
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Citations
33 Claims
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1. A cardiac monitoring apparatus that monitors the cardiac condition of a patient comprising:
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a respiration sensor adapted to sense the respiration of the patient and generating corresponding respiration signal;
an analyzer that analyzes said respiration signals to determine a long term behavior of said respiration signals, and generates a respiration variability signal when said behavior conforms to predetermined criteria indicative of the respiration variability; and
an output device receiving said respiration variability signal and generating an output signal based on said respiration variability signal and indicative of a congestive heart failure status of said patient. - View Dependent Claims (2, 3, 4, 9, 11)
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5. A cardiac monitoring apparatus that monitors the cardiac condition of a patient comprising:
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a respiration sensor adapted to sense the respiration of the patient and generating corresponding respiration signal;
an analyzer that analyzes said respiration signals to determine a long term behavior of said respiration signals, and generates a respiration variability signal when said behavior conforms to predetermined criteria indicative of the respiration variability; and
an output device receiving said respiration variability signal and generating an output signal based on said respiration variability signal indicative of a cardiac condition of said patient;
wherein said analyzer includes a frequency detector that detects and analyzes the frequency of said respiration signals and a power calculator for calculating the power levels above and below a cutoff frequency. - View Dependent Claims (6, 7, 8)
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10. A cardiac monitoring apparatus that monitors the cardiac condition of a patient comprising:
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a respiration sensor adapted to sense the respiration of the patient and generating corresponding respiration signal;
an analyzer that analyzes said respiration signals to determine a long term behavior of said respiration signals, and generates a respiration variability signal when said behavior conforms to predetermined criteria indicative of the respiration variability; and
an output device receiving said respiration variability signal and generating an output signal based on said respiration variability signal indicative of a cardiac condition of said patient;
wherein said respiration sensor includes a tidal volume detector that detects and measures a tidal volume of the patient and a calculator that calculates said respiration signal from said tidal volume.
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12. A cardiac monitoring apparatus for a patient comprising:
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a respiration sensor that senses a breathing pattern of the patient and generates a corresponding respiration signal;
an analyzer that receives said respiration signal and analyzes said signal to determine if said breathing pattern corresponds to preselected criteria, said analyzer generating an indication signal; and
an output device coupled to said analyzer that receives said indication signal, said output device generating an output corresponding to said indication signal, said output corresponding to a congestive heart failure (CHF) status. - View Dependent Claims (13, 14, 15, 16, 17, 19, 20, 21)
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18. A cardiac monitoring apparatus for a patient comprising:
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a respiration sensor that senses a breathing pattern of the patient and generates a corresponding respiration signal;
an analyzer that receives said respiration signal and analyzes said signal to determine if said breathing pattern corresponds to preselected criteria, said analyzer including a calculator that calculates a rate of respiration of the patient from said respiration signal, an da variability detector that receives said rate and calculates a varibility of said respiration rate, said analyzer generating an indication signal indicative of the cardiac condition of the patient based on said variability; and
an output device coupled to said analyzer that receives said indication signal, said output device generating an output corresponding to said indication signal;
wherein said variability detector includes a power detector that detects a relative power of high respiration rate signals and a relative power of low respiration signals, said high an low respiration rate signals defined as being higher an lower than a preselected rate threshold, respectively.
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22. A method of determining the cardiac condition of a patient comprising:
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detecting a respiration signal indicative of a current respiration of the patient;
analyzing said respiration signal to determine if said respiration signal meets predetermined criteria related to a congestive heart failure (CHF) status of the patient; and
generating an indication signal corresponding to said CHF status and based on said analysis. - View Dependent Claims (23, 24)
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25. A method of determining the cardiac condition of a patient comprising:
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detecting a respiration signal indicative of a current respiration of the patient;
analyzing said respiration signal to determine if said respiration signal meets predetermined criteria related to the cardiac condition of the patient; and
generating an indication signal corresponding to said cardiac condition and based on said analysis;
wherein said step of analyzing includes detecting a high signal power of respiration signals having a frequency above a predetermined threshold and detecting a low signal power of respiration signals having a frequency below said predetermined threshold. - View Dependent Claims (26, 27, 28)
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29. A cardiac monitoring apparatus for a patient comprising:
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a respiration sensor that senses a breathing pattern of the patient and generates a corresponding respiration signal;
an analyzer that receives said respiration signal and analyzes said signal to determine if said breathing pattern corresponds to preselected criteria, calculates a rate of respiration of the patient from said respiration signal calculates a variability of said respiration rate and generates an indication signal indicative of a congestive heart failure status of the patient based on said variability; and
an output device coupled to said analyzer that receives said indication signal, said output device generating an output corresponding to said indication signal. - View Dependent Claims (30, 31)
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32. A method of determining a cardiac condition of a patient comprising:
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detecting a respiration signal indicative of a current respiration of the patient;
analyzing said respiration signal including detecting a variability of said respiration signal to determine if said respiration signal meets predetermined criteria related to the congestive heart failure status of the patient; and
generating an indication signal corresponding to said congestive heart failure status and based on said analysis. - View Dependent Claims (33)
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Specification