Method and an apparatus for determining haemodynamic status
AssigneeImperial College of Science, Technology and Medicine
InventorsZachary Whinnett, Darrel Francis, Matthew Shun-Shin, Daniel Keene
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Abstract
A device and a method thereof for determining a haemodynamic state of an individual from a magnitude of a perfusion signal or a signal which is a measure of a volume of blood in the thoracic cavity of the individual, wherein the control device is configured to receive a first signal and a heart rate signal, divide the first signal into frames, wherein a frame length is determined from an oscillation period of the heart rate signal, and determine a magnitude of the first signal from at least two frames, so as to obtain a more reliable magnitude of the first signal.
Claims26
A device for determining a haemodynamic state of an individual from a magnitude of a first signal, wherein the first signal is a perfusion signal or a signal which is a measure of a volume of blood in the thoracic cavity of the individual, wherein the device is configured to:
- receive the first signal and a signal representative of the heart rate from the individual;
- divide the first signal into frames, wherein a frame length is determined from an oscillation period of the heart rate signal;
- and
- determine a magnitude of the first signal from at least two frames.
A device according to any preceding claim, wherein the frame length is determined from an average oscillation period of the heart rate signal.
A device according to any preceding claim, wherein the device is configured to receive a multiple number of first signals and determine a magnitude of each first signal from at least two frames of the same first signal.
A device according to any preceding claim, configured to associate the first signals with concurrently received heart rate signal.
A device according to any preceding claim, comprising a controller for outputting a signal to a device for haemodynamic intervention in response to the determined haemodynamic state of an individual.
A system according to any preceding claim, wherein the first signal is a lead impedance signal.
A method for determining a haemodynamic state of an individual from a magnitude of a first signal, wherein the first signal is a perfusion signal or a signal which is a measure of a volume of blood in the thoracic cavity of the individual, wherein the method comprises the steps of:
- receiving the first signal and a signal representative of the heart rate from the individual;
- dividing the first signal into frames, wherein a frame length is determined from an oscillation period of the heart rate signal;
- and
- determining a magnitude of the first signal from at least two frames.
Dependencies are inferred from the claim text.