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15 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Absorption Spectra of Haemoglobin species |
According to Lambert-Beer's law, the contribution of each species at any given wavelength will be proportional to that species' concentration in the sample. |
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Absorption Spectra of Hb Species |
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Define a continuous monitor. |
Asa defines this as no interruption of a simple measurement. |
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Chromophores? |
Light absorbing molecule. |
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Isobestic point? |
The Wavelength at which 2 or more molecules will have the same absorption. In NIRS, it is used to calculate the total tissue hemoglobin concentration Hb-HbO2 = 805nm in the near infrared Spectrum. Absorption & Wavelength both equal |
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Near infrared wavelengths? |
650 to 940nm. |
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Spatial resolution? |
Depth of tissue being investigated is proportional to the distance between the light source and the detectors |
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Reflectancy Oximetry.? |
The balance between oxygen supply and demand. It is thus a measure of the adequacy of tissue oxygenation. |
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Advantages of NIRS? |
Safe Easy Wide range if clinical fields. |
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Disadvantages of NIRS |
Lacks evidence based data No clear guidance on how to intervene should a problem be detected. NIRS monitors are a work in progress |
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List recommended clinical uses for NIRS |
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List factors reducing cerebral blood 4 flow & CaO2 4 |
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Treatment Algorithm for regional cerebral desaturation during cardiopulmonary bypass. |
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Compare Beer's law to Lamberts law. |
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Combined beer-lambert law? |
If a known intensity of light Illuminates a chamber of a known dimension Then the concentration of the dissolved substances can be measured if the intensity of the incident and transmitted light is measured. |
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