Determination of clinical stress of a subject in pulse oximetry
First Claim
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1. A method for determining clinical stress of a subject, the method comprising the steps of:
- positioning a probe of a pulse oximeter on the subject;
acquiring plethysmographic signal data from the pulse oximeter associated with a subject;
deriving a first measurement signal in a control and processing unit, the first measurement signal being indicative of a predetermined feature of respiration modulation appearing in the plethysmographic signal data, wherein the deriving step includes deriving the first measurement signal indicative of the predetermined feature, in which the predetermined feature is the respiration rate;
forming an index signal in the control and processing unit based on the first measurement signal, wherein the forming step includes a sub-step of generating a second measurement signal indicative of variability in the first measurement signal; and
employing the index signal as an index indicative of the clinical stress of the subject.
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Abstract
The invention relates to the determination of the clinical stress of a subject. In order to bring about an uncomplicated and cost-effective method for monitoring the stress status of a subject, plethysmographic signal data is acquired from the subject and a first measurement signal is derived, which is indicative of a predetemined feature of the respiration modulation appearing in the said signal data. An index signal is then formed based on the first measurement signal and the index signal is employed as an index indicative of the clinical stress of the subject.
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Citations
19 Claims
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1. A method for determining clinical stress of a subject, the method comprising the steps of:
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positioning a probe of a pulse oximeter on the subject; acquiring plethysmographic signal data from the pulse oximeter associated with a subject; deriving a first measurement signal in a control and processing unit, the first measurement signal being indicative of a predetermined feature of respiration modulation appearing in the plethysmographic signal data, wherein the deriving step includes deriving the first measurement signal indicative of the predetermined feature, in which the predetermined feature is the respiration rate; forming an index signal in the control and processing unit based on the first measurement signal, wherein the forming step includes a sub-step of generating a second measurement signal indicative of variability in the first measurement signal; and employing the index signal as an index indicative of the clinical stress of the subject. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for determining clinical stress of a subject, the method comprising the steps of:
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positioning a probe of a pulse oximeter on the subject; acquiring plethysmographic signal data from the pulse oximeter associated with a subject; deriving a first measurement signal in a control and processing unit, the first measurement signal being indicative of a predetermined feature of respiration modulation appearing in the plethysmographic signal data; producing at least one further measurement signal in the control and processing unit from the plethysmographic signal data, wherein the at least one further measurement signal belongs to a group of signals including a first signal indicative of respiration amplitude, a second signal indicative of variability in the respiration amplitude, a third signal indicative of pulse amplitude in the plethysmographic signal data, a fourth signal indicative of pulse-to-pulse interval in the plethysmographic signal data, and a fifth signal indicative of variability in one of the third and fourth signals; forming an index signal in the control and processing unit based on the first measurement signal; and employing the index signal as an index indicative of the clinical stress of the subject.
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Specification