Which condition is associated with a rightward shift in the oxygen dissociation curve?

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Multiple Choice

Which condition is associated with a rightward shift in the oxygen dissociation curve?

A rightward shift in the oxygen dissociation curve means hemoglobin has a lower affinity for oxygen and releases it more readily to tissues. This commonly happens when 2,3-BPG increases, or in states of acidosis, hypercapnia, fever, or chronic anemia, all of which promote oxygen delivery to tissues under stress. Sickle cell anemia fits because the chronic hemolytic anemia associated with it raises 2,3-BPG in red blood cells, decreasing oxygen affinity and shifting the curve to the right, enhancing O2 unloading where needed. Carboxyhemoglobin increases Hb’s affinity for oxygen, pulling the curve to the left and hindering release of oxygen. Hgb F has a higher affinity for oxygen than adult Hb, also causing a leftward shift. Elevation of hemoglobin A2 by itself does not define a rightward shift.

A rightward shift in the oxygen dissociation curve means hemoglobin has a lower affinity for oxygen and releases it more readily to tissues. This commonly happens when 2,3-BPG increases, or in states of acidosis, hypercapnia, fever, or chronic anemia, all of which promote oxygen delivery to tissues under stress.

Sickle cell anemia fits because the chronic hemolytic anemia associated with it raises 2,3-BPG in red blood cells, decreasing oxygen affinity and shifting the curve to the right, enhancing O2 unloading where needed.

Carboxyhemoglobin increases Hb’s affinity for oxygen, pulling the curve to the left and hindering release of oxygen. Hgb F has a higher affinity for oxygen than adult Hb, also causing a leftward shift. Elevation of hemoglobin A2 by itself does not define a rightward shift.

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