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US 10,092,193 B2Granted
Hypovolemia diagnosis technique
AssigneeCovidien LP
InventorsMichael Mestek, Daniel Lisogurski
Life of this patent
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Abstract
Embodiments of the present disclosure relate to a system and method for determining a risk, onset, or presence of hypovolemia based on one or more features of a plethysmographic waveform during a patient breathing cycle. For example, a hypovolemic patient may exhibit characteristic changes in pulse amplitude or stroke volume during inhalation and exhalation relative to a healthy patient. Further, a trend or pattern of such features may be used to assess the patient's fluid condition.
Claims15
A method, comprising:
- using a processor for:
- receiving a plethysmographic waveform signal from a sensor applied to a patient;
- determining one or more features of the plethysmographic waveform over time;
- correlating in time the one or more features of the plethysmographic waveform to an exhalation portion and an inhalation portion of a respiratory cycle of the patient;
- and
- determining an indication of the patient's blood volume based on a change in the one or more features of the plethysmographic waveform correlated in time with the respiratory cycle during the exhalation portion or the inhalation portion of the respiratory cycle, wherein the one or more features comprise a pulse amplitude, wherein the change comprises an increase in pulse amplitude relative to a baseline pulse amplitude value during the exhalation portion of the respiratory cycle that is greater than a range or threshold and a decrease in pulse amplitude relative to the baseline pulse amplitude value during the inhalation portion of the respiratory cycle that is greater than a second range or threshold, and wherein the indication comprises a risk of hypovolemia.
3 more elements
A method, comprising:
- using a processor for:
- receiving a plethysmographic waveform signal from a sensor applied to a patient;
- determining one or more features of the plethysmographic waveform over time;
- correlating in time the one or more features of the plethysmographic waveform to an exhalation portion of a respiratory cycle of the patient;
- extracting one or more portions of the plethysmographic waveform correlated in time with the exhalation portion of the respiratory cycle;
- determining a baseline value for the one or more features of the plethysmographic waveform over a period of time;
- determining a trend of the one or more features of the plethysmographic waveform during the exhalation portion of the respiratory cycle, wherein the trend is indicative of a trending change in the one or more features of the plethysmographic waveform relative to the baseline value, wherein the one or more features comprise a pulse amplitude, and wherein the trending change comprises an increase in pulse amplitude relative to the baseline value during the exhalation portion of the respiratory cycle that is greater than a range or threshold;
- and
- determining a risk of hypovolemia based on a comparison of the trend to the baseline value.
6 more elements
Dependencies are inferred from the claim text.