Cardiovascular system observation method
OwnerHideaki Shimazu, Masaru Komatsuinventors
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Abstract
A cardiovascular system observation method using a computer processor on the basis of pulse wave amplitude data obtained from a patient in a compressed state which changes, said method comprising: process steps for forming measurement patterns expressing the transition of pulse wave amplitude values by smoothing minute fluctuations of said pulse wave amplitude data and normalizing the pulse wave amplitude values and pulse wave intervals of said pulse wave amplitude data; process steps for extracting the features of the measurement patterns; and process steps for judging the pattern shape to judge reference pattern groups to which said measurement pattern belongs by using said features.
Claims18
A cardiovascular system observation method which uses a computer processor for observing cardiovascular conditions of a patient based on pulse wave amplitude data, said data including information about pulse wave amplitude values and pulse wave intervals, and said data being obtained from pressure fluctuations which result from pulse waves which are issued from a body surface of said patient in a compressed state which changes between a higher pressure than a mean blood pressure of said patient and a lower pressure than said mean blood pressure, said cardiovascular system observation method comprising the steps of:
- forming measurement patterns expressing transitions of said pulse wave amplitude values while pressure is gradually decreased or increased in said compressed state, said measurement patterns being formed by smoothing minute fluctuations of said pulse wave amplitude data and normalizing said pulse wave amplitude values and said pulse wave intervals of said pulse wave amplitude data;
- extracting features of said measurement patterns by reference to a plurality of reference pattern groups corresponding to a plurality of cardiovascular conditions based on dynamic properties of blood vessels and cardiac output properties;
- and
- judging said measurement patterns to determine one or more of said reference pattern groups to which said measurement patterns belong by using said features obtained by said extracting features of said measurement patterns.
A cardiovascular system observation method which uses a computer processor for observing cardiovascular conditions of a patient based on pulse wave amplitude data, said data including information about pulse wave amplitude values and pulse wave intervals, and said data being obtained from pressure fluctuations which result from pulse waves which are issued from a body surface of said patient in a compressed state which changes between a higher pressure than a mean blood pressure of said patient and a lower pressure than said mean blood pressure, and based on blood pressure data showing one or more blood pressure values of said patient, said blood pressure data being calculated based on said pulse wave amplitude data, said cardiovascular system observation method comprising:
- forming measurement patterns expressing transitions of said pulse wave amplitude values while pressure is gradually decreased or increased in said compressed state based on said pulse wave amplitude data;
- extracting features of said measurement patterns by reference to a plurality of reference pattern groups corresponding to a plurality of cardiovascular conditions based on dynamic properties of blood vessels, cardiac output properties and blood pressure;
- and
- judging said measurement patterns to determine one or more of said reference pattern groups to which said measurement patterns belong by using said features obtained by said process steps for extracting features of said measurement patterns and said blood pressure data.
A product having a computer readable medium with computer logic recorded thereon for observing the cardiovascular conditions of a patient based on pulse wave amplitude data, said data including pulse wave amplitude values and pulse wave intervals which are obtained from pressure fluctuations resulting from pulse waves which are issued from a body surface of said patient in a compressed state which changes between a higher pressure than a mean blood pressure of said patient and a lower pressure than said mean blood pressure, said product comprising:
- measurement pattern forming means for forming measurement patterns which express transitions of said pulse wave amplitude values while pressure is gradually decreased or increased in said compressed state based on said pulse wave amplitude data;
- feature extracting means for extracting features of said measurement patterns by reference to a plurality of reference pattern groups corresponding to a plurality of cardiovascular conditions based on dynamic properties of blood vessels and cardiac properties;
- and
- pattern shape judging means for determining one or more of said reference pattern groups to which said measurement patterns belong by using said features obtained by said feature extracting means.
Dependencies are inferred from the claim text.