System and method to calculate cardiac characteristics
First Claim
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1. A system comprising;
- a signal acquisition system including an interface configured to;
receive a hemodynamic signal; and
receive a cardiac impedance signal; and
a processor configured to execute a system control program in a memory, the system control program causing the processor to;
identify by the processor a first peak and a second peak of the cardiac impedance signal;
identify by the processor a first portion of the hemodynamic signal corresponding to a full heart cycle based on the cardiac impedance signal first peak;
identify by the processor a second portion of the hemodynamic signal corresponding to the full heart cycle based on the cardiac impedance signal second peak;
calculate a systolic area index (SAI) cardiac characteristic based on the first portion and the second portion of the hemodynamic signal;
the identification of the first portion of the hemodynamic signal including causing the processor to;
employ an adaptive multi-cycle detection window by identifying at least two complete periods of the hemodynamic signal occurring within a predetermined time period, wherein the predetermined timed period is centered around the first peak of the cardiac impedance signal;
create a weighted average of the at least two complete periods of the hemodynamic signal with adaptively controlled coefficients, wherein the adaptively controlled coefficients represent a time interval between a center of the multi-cycle detection window and a peak of the hemodynamic signal for each of the at least two complete periods of the hemodynamic signal, wherein the weighted average acts as a derived hemodynamic cycle;
the calculation of the SAI cardiac characteristic based on the derived hemodynamic cycle;
determine a medical diagnosis based on the calculated SAI cardiac characteristic; and
display on an operator terminal at least one of the medical diagnosis determined by the processor and the SAI cardiac characteristic calculated by the processor.
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Abstract
A system and method includes reception of a hemodynamic signal, reception of a cardiac impedance signal, identification of a first peak and a second peak of the cardiac impedance signal, identification of a first portion of the hemodynamic signal based on the first peak and a second portion of the hemodynamic signal based on the second peak, and calculation of a cardiac characteristic based on the first portion and the second portion of the hemodynamic signal.
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Citations
16 Claims
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1. A system comprising;
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a signal acquisition system including an interface configured to; receive a hemodynamic signal; and receive a cardiac impedance signal; and a processor configured to execute a system control program in a memory, the system control program causing the processor to; identify by the processor a first peak and a second peak of the cardiac impedance signal; identify by the processor a first portion of the hemodynamic signal corresponding to a full heart cycle based on the cardiac impedance signal first peak; identify by the processor a second portion of the hemodynamic signal corresponding to the full heart cycle based on the cardiac impedance signal second peak; calculate a systolic area index (SAI) cardiac characteristic based on the first portion and the second portion of the hemodynamic signal; the identification of the first portion of the hemodynamic signal including causing the processor to; employ an adaptive multi-cycle detection window by identifying at least two complete periods of the hemodynamic signal occurring within a predetermined time period, wherein the predetermined timed period is centered around the first peak of the cardiac impedance signal; create a weighted average of the at least two complete periods of the hemodynamic signal with adaptively controlled coefficients, wherein the adaptively controlled coefficients represent a time interval between a center of the multi-cycle detection window and a peak of the hemodynamic signal for each of the at least two complete periods of the hemodynamic signal, wherein the weighted average acts as a derived hemodynamic cycle; the calculation of the SAI cardiac characteristic based on the derived hemodynamic cycle; determine a medical diagnosis based on the calculated SAI cardiac characteristic; and display on an operator terminal at least one of the medical diagnosis determined by the processor and the SAI cardiac characteristic calculated by the processor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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receiving a hemodynamic signal at a processor configured to execute system control program instructions; receiving a cardiac impedance signal at the processor; identifying by the processor a first peak and a second peak of the cardiac impedance signal; identifying by the processor a first portion of the hemodynamic signal corresponding to a full heart cycle based on the first cardiac impedance signal peak; identifying by the processor a second portion of the hemodynamic signal corresponding to the full heart cycle based on the second cardiac impedance signal peak; calculating a systolic area index (SAI) cardiac characteristic based on the first portion and the second portion of the hemodynamic signal; the identification of the first portion of the hemodynamic signal including; employing an adaptive multi-cycle detection window by the processor identifying at least two complete periods of the hemodynamic signal occurring within a predetermined time period, wherein the predetermined timed period is centered around the first peak of the cardiac impedance signal; creating, by the processor, a weighted average of the at least two complete periods of the hemodynamic signal with an adaptively controlled coefficients, wherein the adaptively controlled coefficients represent a time interval between a center of the multi-cycle detection window and a peak of the hemodynamic signal for each of the at least two complete periods of the hemodynamic signal, wherein the weighted average acts as a derived hemodynamic cycle; the calculation of the SAI cardiac characteristic based on the derived hemodynamic cycle; determining by the processor a medical diagnosis based on the calculated SAI cardiac characteristic; and displaying on an operator terminal at least one of the medical diagnosis determined by the processor and the SAI cardiac characteristic calculated by the processor. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification