Physiologic parameter monitoring apparatus
First Claim
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1. A physiologic parameter monitor, comprising:
- a processor that determines a parameter value indicative of a response of a human or animal subject to fluid intake during fluid therapy based on an impedance cardiographic (ICG) output signal, wherein the processor is configured to;
determine a stroke volume value, for a plurality of heartbeats, based on an area under respective ICG output signal waveforms from when the aortic valve opens to when the aortic valve closes;
determine a respiratory rate value, for the plurality of heartbeats, based on peaks of the respective ICG output signal waveforms over a predetermined time period; and
determine the parameter value based at least on the determined stroke volume value and the determined respiratory rate value as a change in the determined stroke volume divided by the determined respiratory rate; and
a display that displays the parameter value in a human readable format.
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Abstract
A physiologic parameter monitor includes a parameter value determiner that determines a parameter value indicative of a response of a human or animal subject to fluid intake during fluid therapy. The parameter value determiner determines the parameter value based on a signal indicative of a non-invasively obtained state of the subject. The physiologic parameter monitor also includes a display that displays the parameter value in a human readable format.
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Citations
14 Claims
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1. A physiologic parameter monitor, comprising:
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a processor that determines a parameter value indicative of a response of a human or animal subject to fluid intake during fluid therapy based on an impedance cardiographic (ICG) output signal, wherein the processor is configured to; determine a stroke volume value, for a plurality of heartbeats, based on an area under respective ICG output signal waveforms from when the aortic valve opens to when the aortic valve closes; determine a respiratory rate value, for the plurality of heartbeats, based on peaks of the respective ICG output signal waveforms over a predetermined time period; and determine the parameter value based at least on the determined stroke volume value and the determined respiratory rate value as a change in the determined stroke volume divided by the determined respiratory rate; and a display that displays the parameter value in a human readable format. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method, comprising:
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determining, via a processor, a respiratory rate value based on an impedance cardiographic (ICG) signal non-invasively determined by an ICG monitor monitoring a subject, wherein the respiratory rate value is determined from peaks of the ICG signal corresponding to a plurality of heartbeats over a predetermined time period; determining, via the processor, a stroke volume value based on the ICG signal, wherein the stroke volume value is determined for the plurality of heartbeats based on an area under respective ICG output signal waveforms from when the aortic valve opens to when the aortic valve closes; determining, via the processor, a parameter value indicative of a response of a human or animal subject to fluid intake during fluid therapy based at least on the respiratory rate value as a ratio of a change in the stroke volume value to the respiratory rate value; and displaying, via a display, the parameter value in a human readable format. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A non-transitory memory containing instructions which, when executed by a computer, cause the computer to:
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determine a stroke volume value, for the plurality of heartbeats, based on an area under respective ICG signal waveforms from when the aortic valve opens to when the aortic valve closes; determine a respiratory rate value based peaks of the ICG signal corresponding to the plurality of heartbeats over a predetermined time period; determine a parameter value indicative of a response of a human or animal subject to fluid intake during fluid therapy as a ratio of a change in the stroke volume value to the respiratory rate value based on the determined stroke volume value and the determined respiratory rate value; and displaying the parameter value in a human readable format.
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Specification