Method and apparatus for detection of venous pulsation
First Claim
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1. A method for detecting venous pulsation with a patient monitor having a microprocessor, comprising:
- deriving a metric of the pulse shape of one or more plethysmographic signals with the microprocessor;
deriving a phase comparison of the plethysmographic signals with the microprocessor;
combining the metric of the pulse shape and the phase comparison to generate a venous pulsation metric; and
detecting the presence of venous pulsation with the microprocessor based on the venous pulsation metric.
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Abstract
Methods and systems for detecting venous pulsation are provided. In one embodiment, a metric of the pulse shape of one or more plethysmographic signals is derived and the presence of venous pulsation is detected based on the metric of pulse shape. Examples, of metrics of pulse shape include a skew metric and a ratio of a minima-to-maxima time over a pulse period interval. In an exemplary embodiment, the presence of venous pulsation is detected based on a metric of the pulse shape of one or more plethysmographic signals and on a phase comparison of the plethysmographic signals.
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Citations
24 Claims
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1. A method for detecting venous pulsation with a patient monitor having a microprocessor, comprising:
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deriving a metric of the pulse shape of one or more plethysmographic signals with the microprocessor; deriving a phase comparison of the plethysmographic signals with the microprocessor; combining the metric of the pulse shape and the phase comparison to generate a venous pulsation metric; and detecting the presence of venous pulsation with the microprocessor based on the venous pulsation metric. - View Dependent Claims (2, 3, 4, 5, 6, 7, 23)
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8. One or more non-transitory, tangible, machine readable media, comprising code executable to perform the acts of:
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deriving a metric of the pulse shape of one or more plethysmographic signals; deriving a phase comparison of the plethysmographic signals; adjusting the metric of the pulse shape based on a pulse rate; and detecting the presence of venous pulsation based on the adjusted metric of the pulse shape and the phase comparison. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A patient monitoring system comprising:
a patient monitor configured to; derive a metric of the pulse shape of one or more plethysmographic signals; derive a phase comparison of the plethysmographic signals; adjust the metric of the pulse shape based on a pulse rate; and detect the presence of venous pulsation based on the metric of the pulse shape and the phase comparison. - View Dependent Claims (17, 18, 19, 20, 21, 22, 24)
Specification