Physiological monitor
First Claim
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1. A physiological monitoring method comprising the steps of:
- varying perfusion at a tissue site;
measuring a plurality of perfusion values and a corresponding plurality of oxygen saturation values at said tissue site;
characterizing a constant oxygen consumption relationship between said perfusion values and said oxygen saturation values; and
monitoring changes in said constant oxygen consumption relationship as an indication of changes in metabolism at said tissue site.
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Abstract
A patient monitor has multiple sensors adapted to attach to tissue sites of a living subject. The sensors generate sensor signals that are responsive to at least two wavelengths of optical radiation after attenuation by pulsatile blood within the tissue sites. A patient monitor uses the sensor signals to determine changes in constant oxygen consumption as an indication of changes in metabolism at the tissue cite.
148 Citations
9 Claims
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1. A physiological monitoring method comprising the steps of:
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varying perfusion at a tissue site;
measuring a plurality of perfusion values and a corresponding plurality of oxygen saturation values at said tissue site;
characterizing a constant oxygen consumption relationship between said perfusion values and said oxygen saturation values; and
monitoring changes in said constant oxygen consumption relationship as an indication of changes in metabolism at said tissue site. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A physiological monitor capable of varying perfusion at a tissue site and measuring resulting perfusion values corresponding to oxygen consumption values, the physiological monitor comprising:
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an input configured to receive detector signals from a light sensitive detector capable of detecting light attenuated by body tissue at a tissue site, wherein the detector signals include data relating to varying blood perfusion at the tissue site; and
a signal processor configured to measure a plurality of perfusion values from the detector signals, configured to determine a corresponding plurality of oxygen saturation values, configured to characterize a constant oxygen consumption relationship between the plurality of perfusion values and the plurality of oxygen saturation values, and configured to monitor changes in the constant oxygen consumption relationship as an indication of changes in metabolism at the tissue site. - View Dependent Claims (9)
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Specification