Detection of ischemia
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Abstract
In an ischemia detection method, and in an ischemia detector and a cardiac stimulator embodying an ischemia detector, a workload of a patient is measured, as is an ejection fraction (EF) associated with the heart of the patient is determined. A predetermined reference relation between EF and workload for the patient is stored, and an analysis unit detects a state of ischemia of the patient from deviation in the determined EF for various workloads from the stored reference relation.
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Citations
50 Claims
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1-25. -25. (canceled)
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26. An ischemia detector comprising:
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a workload sensor configured to interact with a patient to sense a workload of the patient; an ejection fraction (EF) determining unit that determines an ejection fraction associated with the heart of the patient; a storage unit that stores a predetermined reference relation between EF and workload for the patient; and an analyzing unit that identifies a state of ischemia of the patient dependent on a deviation of EF determined by said EF determining unit for respective workloads of the patient from the stored reference relation. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A heart stimulator comprising:
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an ischemia detector comprising a workload sensor configured to interact with a patient to sense a workload of the patient, an ejection fraction (EF) determining unit that determines an ejection fraction associated with the heart of the patient, a storage unit that stores a predetermined reference relation between EF and workload for the patient, and an analyzing unit that identifies a state of ischemia of the patient dependent on a deviation of EF determined by said EF determining unit for respective workloads of the patient from the stored reference relation; a stimulation pulse delivery arrangement configured to deliver stimulation pulses to the heart of the patient; and a control unit connected to said ischemia detector and to said stimulation pulse delivery arrangement that controls deliver of said stimulation pulses to the patient by said stimulation pulse delivery arrangement dependent on detection of said state of ischemia by said analyzing unit of said ischemia detector. - View Dependent Claims (44, 45)
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46. A method for detecting a state of ischemia of a patient comprising the steps of:
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detecting a parameter indicative of ejection fraction (EF) of the heart of the patient; detecting a parameter indicative of workload of the patient; identifying a predetermined reference relation between EF and workload for the patient; and detecting a state of ischemia of the patient from deviations in EF for respective workloads from said predetermined reference relation. - View Dependent Claims (47, 48, 49, 50)
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Specification