Apparatus for evaluating cardiac function of living subject
First Claim
1. An apparatus for providing physical information relating to a blood-ejecting function of a heart of a living subject, comprising:
- a pressure pulse wave sensor which is adapted to be worn on a body portion of the subject to detect a pressure pulse wave produced from an artery of the subject in synchronism with a heartbeat of the subject;
first determining means for determining a first value of an index corresponding to a systolic area which is defined by a waveform of a first heartbeat-synchronous pulse of the pressure pulse wave detected by said pressure pulse wave sensor before the subject undergoes a physical exercise;
second determining means for determining a second value of said index corresponding to a systolic area which is defined by a waveform of a second heartbeat-synchronous pulse of the pressure pulse wave detected by said pressure pulse wave sensor after the subject undergoes said physical exercise; and
a display device which displays, as said physical information, the determined first and second values of said index in comparison with each other, so that an observer evaluates the blood-ejecting function of the heart of the subject based on said determined first and second values of the index displayed by said display device.
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Accused Products
Abstract
An apparatus for evaluating a blood-ejecting function of a heart of a living subject, including a pressure pulse wave sensor which is adapted to be worn on a body portion of the subject to detect a pressure pulse wave which is produced from an artery of the subject in synchronism with a heartbeat of the subject, a first determining device for determining a first value of an index corresponding to a systolic area which is defined by a waveform of a first heartbeat-synchronous pulse of the pressure pulse wave detected by the pressure pulse wave sensor before the subject undergoes a physical exercise, a second determining device for determining a second value of the index corresponding to a systolic area which is defined by a waveform of a second heartbeat-synchronous pulse of the pressure pulse wave detected by the pressure pulse wave sensor after the subject undergoes the physical exercise, and an evaluating device for evaluating the blood-ejecting function of the heart of the subject, based on the determined first and second values of the index.
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Citations
27 Claims
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1. An apparatus for providing physical information relating to a blood-ejecting function of a heart of a living subject, comprising:
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a pressure pulse wave sensor which is adapted to be worn on a body portion of the subject to detect a pressure pulse wave produced from an artery of the subject in synchronism with a heartbeat of the subject; first determining means for determining a first value of an index corresponding to a systolic area which is defined by a waveform of a first heartbeat-synchronous pulse of the pressure pulse wave detected by said pressure pulse wave sensor before the subject undergoes a physical exercise; second determining means for determining a second value of said index corresponding to a systolic area which is defined by a waveform of a second heartbeat-synchronous pulse of the pressure pulse wave detected by said pressure pulse wave sensor after the subject undergoes said physical exercise; and a display device which displays, as said physical information, the determined first and second values of said index in comparison with each other, so that an observer evaluates the blood-ejecting function of the heart of the subject based on said determined first and second values of the index displayed by said display device. - View Dependent Claims (2, 3, 4)
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5. An apparatus for evaluating a blood-ejecting function of a heart of a living subject, comprising:
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a pressure pulse wave sensor which is adapted to be worn on a body portion of the subject to detect a pressure pulse wave which is produced from an artery of the subject in synchronism with a heartbeat of the subject; first determining means for determining a first value of an index corresponding to a systolic area which is defined by a waveform of a first heartbeat-synchronous pulse of the pressure pulse wave detected by said pressure pulse wave sensor before the subject undergoes a physical exercise; second determining means for determining a second value of said index corresponding to a systolic area which is defined by a waveform of a second heartbeat-synchronous pulse of the pressure pulse wave detected by said pressure pulse wave sensor after the subject undergoes said physical exercise; and evaluating means for evaluating said blood-ejecting function of the heart of the subject, based on the determined first and second values of said index. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for providing physical information relating to a myocardial ischemia of a heart of a living subject, comprising:
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a continuous blood-pressure measuring device which continuously measures a blood pressure of the subject, thereby providing continuously measured blood-pressure values of the subject; first frequency-analysis means for analyzing respective frequencies of a plurality of blood-pressure fluctuating components occurring in said continuously measured blood-pressure values, thereby providing a frequency spectrum of said blood-pressure fluctuating components, said first frequency-analysis means extracting, from said continuously measured blood-pressure values, a first one of said blood-pressure fluctuating components which has a frequency lower than a frequency of a second one of said blood-pressure fluctuating components which corresponds to a respiration of the subject; and a display device which displays, as said physical information, at least one of (a1) the first blood-pressure fluctuating component extracted from the continuously measured blood pressure values provided by said blood-pressure measuring device before the subject undergoes a physical exercise and (a2) a first value of an index derived from the first blood-pressure fluctuating component obtained before the exercise, and at least one of (b1) the first blood-pressure fluctuating component extracted from the continuously measured blood pressure values provided by said blood-pressure measuring device after the subject undergoes said physical exercise and (b2) a second value of said index derived from the first blood-pressure fluctuating component obtained after the exercise, in comparison with each other, so that an observer evaluates the myocardial ischemia of the heart of the subject based on said one of said first blood-pressure fluctuating component obtained before said exercise and said first value of the index and said one of said first blood-pressure fluctuating component obtained after said exercise and said second value of the index displayed by said display device. - View Dependent Claims (14, 15)
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16. An apparatus for evaluating a myocardial ischemia of a heart of a living subject, comprising:
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a continuous blood-pressure measuring device which continuously measures a blood pressure of the subject, thereby providing continuously measured blood pressure values of the subject; first frequency-analysis means for analyzing respective frequencies of a plurality of blood-pressure fluctuating components occurring in said continuously measured blood pressure values, thereby providing a frequency spectrum of said blood-pressure fluctuating components, said first frequency-analysis means extracting, from said continuously measured blood pressure values, a first one of said blood-pressure fluctuating components which has a frequency lower than a frequency of a second one of said blood-pressure fluctuating components which corresponds to a respiration of the subject; and evaluating means for evaluating the myocardial ischemia of the subject based on at least one of (a1) the first blood-pressure fluctuating component extracted from the continuously measured blood pressure values provided by said blood-pressure measuring device before the subject undergoes a physical exercise and (a2) a first value of an index derived from the first blood-pressure fluctuating component obtained before the exercise, and at least one of (b1) the first blood-pressure fluctuating component extracted from the continuously measured blood pressure values provided by said blood-pressure measuring device after the subject undergoes said physical exercise and (b2) a second value of said index derived from the first blood-pressure fluctuating component obtained after the exercise. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. An apparatus for evaluating a blood-ejecting function of a heart of a living subject, comprising:
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an electrocardiograph which provides an electrocardiogram of the subject; at least one pulse-wave sensor which is adapted to be worn on the subject to detect at least one pulse wave from the subject; pre-ejection period determining means for determining a pre-ejection period between a Q point of a heartbeat-synchronous pulse of the electrocardiogram provided by said electrocardiograph, and a minimum point of a corresponding heartbeat-synchronous pulse of an intra-aortic pulse wave of the subject, based on a waveform of said electrocardiogram and a waveform of the pulse wave detected by said pulse-wave sensor; and evaluating means for evaluating the blood-ejecting function of the heart of the subject based on the pre-ejection period determined by said pre-ejection period determining means. - View Dependent Claims (24, 25, 26, 27)
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Specification