Method and system for determining a physiological condition using a two-dimensional representation of R-R intervals
First Claim
1. A method for determining a physiological condition of a person, the method operating in a physiological condition determining system, the method comprising:
- using a sensor of the physiological condition determining system for sampling a plurality of heart beats of the person;
extracting in a control unit of the physiological condition determining system a series of cardiac R-R intervals from the heart beat samples; and
using the control unit for providing a two-dimensional representation of subsequent R-R intervals, wherein two subsequent R-R intervals form an entry in the two-dimensional representation resulting in a plurality of entries in the two-dimensional representation,determining in the control unit a centroid, for the plurality of entries in the two-dimensional representation;
fitting in the control unit a closed curve through the plurality of entries in the two-dimensional representation, wherein a center of said closed curve coincides with said centroiddetermining in the control unit distances between the closed curve and the plurality of entries in the two-dimensional representation; and
determining in the control unit the physiological condition of the person by determining if the determined distances are above or below a predetermined first threshold.
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Accused Products
Abstract
The physiological condition of a person is determined in physiological condition determining system by using a sensor for sampling a plurality of heart beats of the person, and using a control unit to perform the acts of: extracting a series of cardiac R-R intervals from the heart beat samples, providing a two-dimensional representation of subsequent R-R intervals, wherein two subsequent R-R interval forms an entry in the two-dimensional representation resulting in a plurality of entries, determining a centroid, an average radius and an average rotation frequency for the plurality of entries in the two-dimensional representation, determining a plurality of distances between the radius and each of the entries in the two-dimensional representation, and determining the physiological condition of the person using the radius in combination with the plurality of distances.
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Citations
11 Claims
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1. A method for determining a physiological condition of a person, the method operating in a physiological condition determining system, the method comprising:
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using a sensor of the physiological condition determining system for sampling a plurality of heart beats of the person; extracting in a control unit of the physiological condition determining system a series of cardiac R-R intervals from the heart beat samples; and using the control unit for providing a two-dimensional representation of subsequent R-R intervals, wherein two subsequent R-R intervals form an entry in the two-dimensional representation resulting in a plurality of entries in the two-dimensional representation, determining in the control unit a centroid, for the plurality of entries in the two-dimensional representation; fitting in the control unit a closed curve through the plurality of entries in the two-dimensional representation, wherein a center of said closed curve coincides with said centroid determining in the control unit distances between the closed curve and the plurality of entries in the two-dimensional representation; and determining in the control unit the physiological condition of the person by determining if the determined distances are above or below a predetermined first threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for determining a physiological condition of a person, the system comprising:
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at least one sensor for sampling a plurality of heart beats of the person; and a control unit adapted for; extracting a series of cardiac R-R intervals from the heart beat samples; and providing a two-dimensional representation of subsequent R-R intervals, wherein two subsequent R-R intervals form an entry in the two-dimensional representation resulting in a plurality of entries in the two-dimensional representation, determining a centroid, for the plurality of entries in the two-dimensional representation; fitting a closed curve through the plurality of entries in the two-dimensional representation, wherein a center of said closed curve coincides with said centroid; determining of a distance between the closed curve and the plurality of entries in the two-dimensional representation; and determining the physiological condition of the person by determining if the determined distances are above or below a predetermined first threshold.
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11. A method for determining a physiological condition of a person, the method operating in a physiological condition determining system, the method comprising:
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using a sensor of the physiological condition determining system for sampling a plurality of heart beats of the person; extracting in a control unit of the physiological condition determining system, a series of cardiac R-R intervals from the heart beat samples; and providing in the control unit a two-dimensional representation of subsequent R-R intervals, wherein two subsequent R-R intervals form an entry in the two-dimensional representation resulting in a plurality of entries in the two-dimensional representation, determining in the control unit a centroid, an average radius and an average rotation frequency for the plurality of entries in the two-dimensional representation; determining in the control unit a plurality of distances between a radius and each of the plurality of entries in the two-dimensional representation; and determining in the control unit the physiological condition of the person by using the radius in combination with the plurality of distances.
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Specification