| 摘要 |
An augmentation-index determining apparatus, including a cuff, a cuff-pressure changing device which changes a pressing pressure of the cuff, a pulse-wave extracting device which extracts a pulse wave from the cuff, a peak-occurrence-time determining device for determining, based on a high-cuff-pressure pulse wave which is extracted by the pulse-wave extracting device when the cuff-pressure changing device makes the pressing pressure of the cuff higher than a systolic blood pressure of a subject, a time of occurrence of a peak point of an incident-wave component of the high-cuff-pressure pulse and a time of occurrence of a peak point of a reflected-wave component of the high-cuff-pressure pulse wave, and an augmentation-index determining device for determining, based on the respective times of occurrence of the respective peak points of the incident-wave and reflected-wave components of the high-cuff-pressure pulse, respective times of occurrence of respective peak points of incident-wave and reflected-wave components of a low-cuff-pressure pulse which is extracted by the pulse-wave extracting device when the cuff-pressure changing device makes the pressing pressure of the cuff lower than a mean blood pressure of the subject, and determining an augmentation index based on respective magnitudes of the low-cuff-pressure pulse wave at the respective times of occurrence of the respective peak points of the incident-wave and reflected-wave components of the low-cuff-pressure pulse.
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