Detecting or validating a detection of a state change from a template of heart rate derivative shape or heart beat wave complex
AssigneeFlint Hills Scientific, L.L.C.
InventorsIvan Osorio, Mark Frei
Life of this patent
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Abstract
Methods, systems, and apparatus for detecting and/or validating a detection of a state change by matching the shape of one or more of an cardiac data series, a heart rate variability data series, or at least a portion of a heart beat complex, derived from cardiac data, to an appropriate template.
Claims25
A computer readable program storage unit encoded with instructions that, when executed by a computer, perform a method for indicating an occurrence of a state change, comprising:
- obtaining a time series of cardiac data from a patient;
- determining a reference heart rate parameter from said cardiac data;
- determining a heart rate derivative shape from said time series of cardiac data, wherein said heart rate derivative shape comprises at least one characteristic selected from a number of phases relative to said reference heart rate parameter, a number of extrema of said heart rate derivative, a number of directions of change of said heart rate derivative, an area under the curve of at least one phase, a number of positive phases, or a number of negative phases;
- and,
- indicating an occurrence of a state change based upon a determination that said heart rate derivative shape matches a state change template in said at least one characteristic,
- wherein said at least one characteristic of said state change template comprises two or more phases relative to said reference heart rate parameter, two or more extrema of said heart rate derivative, three or more directions of change of said heart rate derivative, a number of positive phases, or a number of negative phases, provided the total number of positive phases and negative phases is two or more.
A computer readable program storage unit encoded with instructions that, when executed by a computer, perform a method for indicating an occurrence of a state change, comprising:
- obtaining a time series of cardiac data from a patient;
- determining a reference heart rate parameter from said cardiac data;
- determining a heart rate derivative shape from said time series of cardiac data, wherein said heart rate derivative shape comprises at least one characteristic selected from a number of phases relative to said reference heart rate parameter, a number of extrema of said heart rate derivative, a number of directions of change of said heart rate derivative, a number of positive phases, or a number of negative phases;
- and,
- indicating an occurrence of a state change based upon a determination that said heart rate derivative shape matches a state change template in said at least one characteristic.
A computer readable program storage unit encoded with instructions that, when executed by a computer, perform a method for indicating an occurrence of a state change, comprising:
- obtaining a time series of instantaneous heart rate measurements from a patient;
- determining a reference heart rate parameter from at least a portion of said instantaneous heart rate measurements in a first time window, wherein said reference heart rate parameter for the first time window is selected from the group consisting of a measure of central tendency of heart rate for the first time window, a measure of heart rate determined from a linear equation describing heart rate within the first time window, a measure of heart rate determined from a higher order polynomial equation describing heart rate within the first time window, and a vector describing heart rate within the first time window;
- determining an instantaneous heart rate shape from said time series of instantaneous heart rate measurements in a second time window, wherein said instantaneous heart rate shape comprises at least one characteristic selected from a number of phases relative to said reference heart rate parameter, a number of extrema of said instantaneous heart rate, a number of directions of change of said instantaneous heart rate, a number of positive phases of said instantaneous heart rate, or a number of negative phases of said instantaneous heart rate;
- and,
- indicating an occurrence of a state change based upon a determination that said instantaneous heart rate shape matches a state change template in said at least one characteristic.
Dependencies are inferred from the claim text.