HYPOVOLEMIA DIAGNOSIS TECHNIQUE
First Claim
Patent Images
1. 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 at least one of an exhalation portion or 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 at least one of the exhalation portion or the inhalation portion of the respiratory cycle, wherein the one or more features comprise a pulse amplitude and wherein an increase in pulse amplitude during the exhalation portion of the respiratory cycle that is greater than a range or threshold is indicative of a change in the patient'"'"'s blood volume.
3 Assignments
0 Petitions
Accused Products
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.
24 Citations
22 Claims
-
1. 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 at least one of an exhalation portion or 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 at least one of the exhalation portion or the inhalation portion of the respiratory cycle, wherein the one or more features comprise a pulse amplitude and wherein an increase in pulse amplitude during the exhalation portion of the respiratory cycle that is greater than a range or threshold is indicative of a change in the patient'"'"'s blood volume. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 15, 16)
-
12. 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 at least one of an exhalation portion or an inhalation portion of a respiratory cycle of the patient; 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 inhalation portion or the exhalation portion of the respiratory cycle; and determining a risk of hypovolemia based on a comparison of the trend to the baseline value. - View Dependent Claims (13, 14)
-
17. A method, comprising:
using a processor for; receiving a plethysmographic waveform signal from a sensor applied to a patient; estimating a stroke volume over time for the patient based on one or more features of the plethysmographic waveform signal; correlating the stroke volume in time to an exhalation portion of a respiratory cycle of the patient; and determining if the patient is at risk of developing hypovolemia based on an increase in the stroke volume during the exhalation portion of the respiratory cycle relative to a first range or threshold. - View Dependent Claims (18, 19, 20, 21, 22)
Specification