Apparatus and method for sensing cardiac function
First Claim
1. An apparatus for sensing cardiac function in a patient, such apparatus comprising:
- (a) sensors for electrical connection to such patient to sense ECG signals in at least one plane in such patient;
(b) an axis analyzer for deriving a signal representation of the electrical axis of the heart of such patient from said ECG signals;
(c) a detector for detecting changes in said signal representation of the electrical axis of said heart; and
(d) evaluation means for determining when said changes in said signal representation indicates a cardiac condition.
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Accused Products
Abstract
An apparatus and method for sensing cardiac function in a patient, particularly adaptable to being worn by an ambulatory patient. Including sensor to receive ECG signals in at least plane of the patient chest area, and an analyzer to derive a signal representation of the electrical axis of the patient heart. Changes in the signal representation can be evaluated to include heart condition. The axis analyzer and other ECG information can be used to generate rate information used in conjunction with the heart axis signal representation. Incidence of phase zero-crossing of the heart axis signal representation and the magnitude peaks can be used to indicate and distinguish various heart conditions.
305 Citations
36 Claims
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1. An apparatus for sensing cardiac function in a patient, such apparatus comprising:
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(a) sensors for electrical connection to such patient to sense ECG signals in at least one plane in such patient; (b) an axis analyzer for deriving a signal representation of the electrical axis of the heart of such patient from said ECG signals; (c) a detector for detecting changes in said signal representation of the electrical axis of said heart; and (d) evaluation means for determining when said changes in said signal representation indicates a cardiac condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A wearable apparatus for sensing cardiac function in a patient, such apparatus comprising:
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(a) sensors for electrical connection to such patient to sense ECG signals; (b) analyzer for deriving rate information from said ECG signals; (c) axis analyzer for deriving a signal representation of the electrical axis of the heart of such patient from said ECG signals; and (d) evaluation means for determining cardiac condition from said rate information and said signal representation of the electrical axis of the heart of such patient. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method of sensing cardiac function in a patient comprising:
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(a) electrically connecting sensors to such patient to sense ECG signals in at least one plane; (b) deriving from said ECG signals a signal representation of the electrical axis of the heart of such patient; (c) detecting changes in said signal representation of the electrical axis of the heart of said patient; and (d) determining cardiac condition from said changes in the electrical axis of the heart of said patient. - View Dependent Claims (31, 32, 33, 34, 35, 36)
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Specification