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The oxygen–hemoglobin dissociation curve, also called the oxyhemoglobin dissociation curve or oxygen dissociation curve (ODC), is a curve that plots the proportion of hemoglobin in its saturated (oxygen-laden) form on the vertical axis against the prevailing oxygen tension on the horizontal axis. This curve is an important tool for ...
Finger tip carboxyhemoglobin saturation monitor.. A CO-oximeter is a device that measures the oxygen carrying state of hemoglobin in a blood specimen, including oxygen-carrying hemoglobin (O2Hb), non-oxygen-carrying but normal hemoglobin (HHb) (formerly, but incorrectly, referred to as 'reduced' hemoglobin), as well as the dyshemoglobins such as carboxyhemoglobin (COHb) and methemoglobin (MetHb).
The absorption spectra of oxyhemoglobin and deoxyhemoglobin differ. The oxyhemoglobin has significantly lower absorption of the 660 nm wavelength than deoxyhemoglobin, while at 940 nm its absorption is slightly higher. This difference is used for the measurement of the amount of oxygen in a patient's blood by an instrument called a pulse oximeter.
The Hill coefficient is a measure of ultrasensitivity (i.e. how steep is the response curve). The Hill coefficient, n {\displaystyle n} or n H {\displaystyle n_{H}} , may describe cooperativity (or possibly other biochemical properties, depending on the context in which the Hill equation is being used).
This measurement is often used under treatment with a heart lung machine (extracorporeal circulation), and can give the perfusionist an idea of how much flow the patient needs to stay healthy. Tissue oxygen saturation (StO 2) can be measured by near infrared spectroscopy. Although the measurements are still widely discussed, they give an idea ...
Hemoximetry is the monitoring of hemoglobin and oxygen saturation, especially during procedures such as cardiac catheterization. [1]Hemoximetry presents hemoglobin oxygen saturation, dyshemoglobines, and total hemoglobin concentration data.
This may cause weight loss in the short term, by the scale's measure. But losing water weight isn't the same as losing fat, and diarrhea can cause dehydration and electrolyte imbalances. Myth 10 ...
Other methods which propose to measure neural activity directly have been attempted (for example, measurement of the Oxygen Extraction Fraction, or OEF, in regions of the brain, which measures how much of the oxyhemoglobin in the blood has been converted to deoxyhemoglobin [4]), but because the electromagnetic fields created by an active or ...