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A follow-up on functional parameters of blood stored in ACD at +4 degrees C
Insights
Blood storage for 40 days at 4°C shows DPG depletion within 10 days. Despite this, hemoglobin
Area of Science:
- Biochemistry
- Hematology
- Transfusion Medicine
Background:
- Blood storage conditions impact red blood cell function.
- Maintaining optimal oxygen-carrying capacity during storage is crucial for transfusion efficacy.
Purpose of the Study:
- To evaluate the functional parameters of stored blood over 40 days.
- To assess hemoglobin-oxygen affinity changes during prolonged blood storage.
Main Methods:
- Blood stored at +4°C in acid citrate dextrose (ACD) solution.
- Monitoring of key functional parameters over a 40-day period.
- Analysis of 2,3-diphosphoglycerate (DPG) levels and pH.
Main Results:
- 2,3-DPG depletion occurred within 10 days of storage.
- No significant increase in hemoglobin-oxygen affinity was observed at storage pH.
- Correcting for pH changes revealed an intrinsic increase in hemoglobin-oxygen affinity.
Conclusions:
- Standard blood storage conditions lead to DPG depletion.
- The Bohr effect due to pH lowering masks the intrinsic increase in hemoglobin affinity.
- Adjusting for pH demonstrates that hemoglobin retains an increased affinity for oxygen during storage.
Abstract:
The main functional parameters of blood stored at +4 degrees C in ACD, according to the common transfusional practice, have been carefully followed in the course of 40 days. The expected depletion of DPG takes place within 10 days, but apparently, no increase of the Hb affinity towards oxygen is observed in this period (or later), because pH lowering acts in the opposite direction during the same time. However, the intrinsic increased affinity of Hb is promptly revealed if the "actual" pHs are corrected at the standard value of 7.4, and/or are extrapolated at this pH from Bohr effect.