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US 9,867,547 B2Granted
System and method to calculate cardiac characteristics
AssigneeSiemens Healthcare GmbH
InventorsHarold James Wade, Hongxaun Zhang, Anthony Lawrence
Life of this patent
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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.
Claims16
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.
14 more elements
A method comprising:
- 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.
11 more elements
Dependencies are inferred from the claim text.