Physiological monitor
First Claim
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1. A physiological monitoring method comprising the steps of:
- determining, using at least one processor, a plurality of perfusion values and a corresponding plurality of oxygen saturation values at a tissue site;
characterizing, using said at least one processor, a constant oxygen consumption relationship between said perfusion values and said oxygen saturation values;
detecting, using said at least one processor, perfusion-limited oxygen consumption at said tissue site when said constant oxygen consumption relationship is no longer valid; and
adjusting fractional inspired oxygen according to the plurality of oxygen saturation values and so as to account for changes in the plurality of oxygen saturation values that result from perfusion-limited oxygen consumption.
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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.
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Citations
15 Claims
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1. A physiological monitoring method comprising the steps of:
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determining, using at least one processor, a plurality of perfusion values and a corresponding plurality of oxygen saturation values at a tissue site; characterizing, using said at least one processor, a constant oxygen consumption relationship between said perfusion values and said oxygen saturation values; detecting, using said at least one processor, perfusion-limited oxygen consumption at said tissue site when said constant oxygen consumption relationship is no longer valid; and adjusting fractional inspired oxygen according to the plurality of oxygen saturation values and so as to account for changes in the plurality of oxygen saturation values that result from perfusion-limited oxygen consumption. - View Dependent Claims (2, 3, 4, 5)
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6. A physiological monitoring method comprising the steps of:
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determining, using at least one processor, delta oxygen saturation at a tissue site; monitoring, using said at least one processor, perfusion at said tissue site so as to account for changes in delta oxygen saturation that result from changes in perfusion; and adjusting fractional inspired oxygen according to said delta oxygen saturation measurement so as to maintain supply-independent oxygen consumption at said tissue site. - View Dependent Claims (7)
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8. A physiological monitoring method comprising the steps of:
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providing a plurality of FiO2 adjustments for a person having a tissue site; measuring a plurality of oxygen consumption values at said tissue site corresponding to said FiO2 adjustments; determining, using said at least one processor, an oxygen supply independent region and at least one of an oxygen supply dependent region and a plasma dependent region for said oxygen consumption values; and adjusting FiO2 based upon a transition between at least one of said regions, said transition being a deflection in said oxygen consumption values as a function of FiO2. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification