dyshemoglobin

dyshemoglobin

(dĭs-hĕm″ō-glō′bĭn),

dysHb

A hemoglobin derivative that is incapable of reversibly associating with oxygen, and so is unable to carry oxygen from the lungs to the cells. The primary defect in dyshemoglobins is a chemical (or stereochemical) alteration of the heme prosthetic group. Two common dyshemoglobins are carboxyhemoglobin (COHb) in which carbon monoxide is covalently bonded to the hemoglobin molecule, and methemoglobin (metHb) in which the ferrous iron is oxidized to the ferric form. Other, indeterminate dyshemoglobins exist in minute amounts in circulating blood.
References in periodicals archive ?
2]sat will be incorrect in the presence of a dyshemoglobin.
If a substantial proportion of dyshemoglobins are present, the [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] Hb will be lower than the S[O.
1998): "Using pulse oximetry when dyshemoglobin levels are high".
Oxygen capacity may be diminished in patients by an increased fraction of inactive hemoglobin, later called dyshemoglobin (5).
2], and dyshemoglobin fractions would be displayed, but in vain.
If the CO-oximeter had been programmed to display the dyshemoglobin fractions instead of fractional saturation, the diagnosis would have been obvious after analysis of the first arterial blood sample.
2] is not too low and that no significant amount of dyshemoglobin is present.
2], and dyshemoglobin fractions will suffice; in more complicated cases, arterial P[O.
The purpose of this case conference is to present the limitations and distinctions of the methods used to assess oxygenation status, particularly in cases of increased dyshemoglobin fractions such as methemoglobinemias.
In the presence of substantial dyshemoglobin fractions, F[O.
In the absence of a dyshemoglobin, an absorbance ratio of 1.
2]Hb and the dyshemoglobin fractions until the presence of these dyshemoglobins is ruled out.