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- W199482695 abstract "Stability, accuracy, and convenience of a fiberoptic reflection oximeter utilizing CdSe photocells were improved by simple alterations of the optical system and of the Wheatstone bridge readout circuit. Use of a halogen-cycle lamp and neutral-density optical wedges, together with a two-standard calibration technique, improved the stability and precision of the transducer. Continuous illumination of the photocells between periods of use and matching of the photocell sensitivities reduced losses of precision and accuracy previously encountered with these photodetectors. The output of the oximeter was made linear and direct-reading by simple adjustments of the Wheatstone bridge parameters. Evidence of increased erythropoietic activity appeared every four months following acute massive blood loss in dogs. Each period of activity lasted approximately 30 dsys, and such crises were readily detected even a year after the hemorrhage. Each erythropoietic crisis was accompanied by decreases in RBC, PCV, and total hemoglobin; increases in MCV, MCH, MCHC, and resistance of erythrocytes to osmotic hemolysis; and increased anisocytosis and polychromatophilia on Wright's-stained smears of venous blood. Cyclic erythropoiesis results from synchronization of life cycles of erythrocytes produced in response to the hemorrhage; it is detectable by virtue of changes in physical characteristics of these cells as they age. Effects of changes in PCV, plasma protein concentration, degree of hemolysis, osmotic pressure, pH, , temperature, and mean erythrocyte age on accuracy of reflection oximetry were studied using canine blood. Decreases in PCV below 30% or increased plasma osmotic pressure caused" @default.
- W199482695 created "2016-06-24" @default.
- W199482695 creator A5057069452 @default.
- W199482695 date "2018-08-13" @default.
- W199482695 modified "2023-10-16" @default.
- W199482695 title "Sources of error in reflection oximetry" @default.
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- W199482695 doi "https://doi.org/10.31274/rtd-180813-4410" @default.
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