Biomedical subjects

C K Oliver

Publications and source records attributed to C K Oliver.

6 recordsLinked to original sources

PubMed2001

The effects of polyvinyl chloride and polyolefin blood bags on red blood cells stored in a new additive solution.

BACKGROUND AND OBJECTIVES: Red blood cells (RBCs) must be stored in polyvinyl chloride (PVC) bags plasticized with di-2-ethylhexyl phthalate or a similar plasticizer to achieve their full storage life with conventional storage solutions. Improved storage solutions might remove this requirement and allow blood storage in other plastics. Experimental Additive Solution-61 (EAS-61), which maintains RBCs for 9 weeks with reduced haemolysis and satisfactory 51Cr 24-h recovery, is an appropriate candidate improved RBC storage solution. MATERIALS AND METHODS: Twenty-four units of packed RBCs were pooled in groups of four units, each pool was realiquoted into four units and stored, six pooled units per arm, in one of the following: 100 ml of EAS-61 in PVC; 200 ml of EAS-61 in PVC; 100 ml of EAS-61 in polyolefin (PO); and 200 ml of EAS-61 in PO. Haemolysis, RBC morphology indices, RBC ATP concentrations, and other measures of RBC metabolism and function were measured weekly. RESULTS: RBC haemolysis exceeded 1% by 7 weeks in PO bags containing 100 ml or 200 ml of EAS-61. In PVC bags, haemolysis was less than 1% at 11 weeks. RBC ATP concentrations were 1 mol/g of haemoglobin (Hb) higher at 2 weeks in the PVC-stored units. CONCLUSIONS: RBCs stored in PVC had markedly less haemolysis and higher RBC ATP concentrations than those stored in PO. Haemolysis would limit RBC storage in PO bags to a duration of 6 weeks, even with EAS-61.

Adenosine Triphosphate↗

PubMed2001

The effect of two additive solutions on the postthaw storage of RBCs.

BACKGROUND: Sterile systems for freezing and for washing thawed blood will allow the storage of RBCs for more than 24 hours after removal of the cryoprotectant glycerol. This study assessed the effect of two ASs in maintaining deglycerolized RBCs. STUDY DESIGN AND METHODS: Twenty-four RBC units were stored for 6 days, pooled in groups of 4, realiquoted, sterilely glycerolized, and frozen. One month later, the units were thawed, sterilely deglycerolized by using an automated system (H215; Haemonetics), and stored for 5 weeks in either 100 or 200 mL of AS-3 or an experimental AS (EAS-61). Sterile samples were taken weekly for chemical and morphometric analysis. RESULTS: The glycerolization and deglycerolization process produced highly comparable RBC units, but it caused a marked reduction of RBC pH, to about 6.4 at the beginning of storage. The addition of acidic AS-3 further reduced the pH, which in turn reduced glucose consumption, lactate formation, and RBC ATP concentrations. Alkaline EAS-61 increased these measures. Hypotonic EAS-61 caused increased cell swelling and hemolysis, despite better RBC morphology. CONCLUSIONS: Automation of sterile glycerolization and deglycerolization with the H215 works well, but the solutions should be reformulated for extended postthaw storage. This would best be accomplished by raising the pH of the wash solutions by the addition of disodium phosphate or sodium bicarbonate or both, by using alkaline ASs, and by matching the osmolality of the wash solution and ASs.

Adenine↗

PubMed2001

The role of electrolytes and pH in RBC ASs.

BACKGROUND: Experimental additive solutions (EASs) containing saline, adenine, glucose, mannitol and disodium phosphate can support RBCs for 9 or 10 weeks if used in 200- or 300-mL volumes. The effects of variations in the electrolyte composition and volume of EASs were explored. STUDY DESIGN AND METHODS: In three four-arm studies, 24 RBC units were pooled in groups of 4 and realiquoted as test units to ensure that all donors were equally represented in each study arm. In Study 1, units were stored for 11 weeks in EAS containing 0, 10, 20, or 30 mmol per L of sodium bicarbonate. In Study 2, units were stored for 9 weeks in EAS containing 26, 50, 100, or 150 mmol per L of sodium chloride. In Study 3, units were stored in 100 or 200 mL of AS-3 or EAS-61. RBC ATP concentrations and hemolysis were measured weekly. RESULTS: Increasing the sodium bicarbonate content of EASs increased the pH throughout storage and increased RBC ATP concentrations in the later phases of storage, but it had no effect on hemolysis. Increased sodium chloride content of EASs led to lower RBC ATP concentrations and increased hemolysis. In EAS-61, RBC ATP concentrations were increased throughout storage, and hemolysis was lower than that of RBCs stored in AS-3. CONCLUSION: RBC ATP synthesis is highly dependent on the pH of the AS. Hemolysis is affected by the salt content and volume of the AS.

Adenosine Triphosphate↗

PubMed2001

RBC storage for 11 weeks.

BACKGROUND: Increasing the length of RBC storage can increase both RBC availability and quality. This work addresses 11-week RBC storage in experimental ASs (EASs). STUDY DESIGN AND METHODS: Three studies were performed. In the first, 24-hour in vivo recovery of (51)Cr-labeled autologous RBCs was measured in nine volunteers after storage of their RBCs for 11 weeks in EAS 67. In the second study, 4 units of blood were divided and stored in aliquots with an EAS containing 0, 15, 30, or 45 mmol per L of mannitol; then hemolysis, RBC morphology, and microvesicle protein were measured. In the third study, 6 full units were stored for 12 weeks in the EAS containing 30 mmol per L of mannitol, with weekly sampling for morphologic and biochemical measures of RBC quality. RESULTS: RBCs stored for 11 weeks in EAS-67 had a mean 24-hour in vivo recovery of 79 +/- 5 percent, but the hemolysis was 1.35 +/- 0.68 percent. Increasing mannitol content of the EAS reduced hemolysis but increased microvesiculation. EAS-76, with 30 mmol per L of mannitol allowed 11-week storage with 0.48 +/- 0.10 percent hemolysis at 11 weeks and 0.62 +/- 0.14 percent hemolysis at 12 weeks. CONCLUSION: It is possible to store RBCs for 11 weeks in EAS with greater than 75 percent recovery and less than 1 percent hemolysis.

Adult↗

PubMed2000

The effects of phosphate, pH, and AS volume on RBCs stored in saline-adenine-glucose-mannitol solutions.

BACKGROUND: RBC ATP concentrations are the most important correlate of RBC viability. Tests were performed to determine whether increased AS volume, pH, and phosphate content increased stored RBC ATP concentrations. STUDY DESIGN AND METHODS: In three studies, packed RBCs were pooled in groups of 3 or 4 units and realiquoted as combined units to reduce intradonor differences. Pooled units were stored in the licensed ASs, AS-1 or AS-5, which contain saline, adenine, glucose, and mannitol (SAGM), or in experimental ASs (EASs) containing SAGM and disodium phosphate. Ten pools were stored in AS-1 at RBC concentrations equivalent to 100, 200, or 300 mL of AS. Six pools were stored in 100, 200, 300, or 400 mL volumes of EAS-61. Ten pools were stored in 100 mL of AS-5, 200 mL of EAS-61, or 300 mL of EAS-64. RBC ATP concentration and other measures of RBC metabolism and function were measured weekly. RESULTS: RBC ATP concentrations decreased sooner with storage in increasing volumes of AS-1. In EAS-61 and EAS-64, RBC ATP concentrations initially increased and stayed elevated longer with increasing AS volume. CONCLUSIONS: The addition of disodium phosphate to SAGM AS increases the RBC ATP concentrations. Reducing storage Hct appears to have a separate beneficial effect in reducing hemolysis.

Adenine↗

PubMed1995

The r' gene is overrepresented in hrB-negative individuals.

A screening program was implemented to identify hrB- donors. D- C+, D-C-, and D+C- samples from African-American donors were typed with multiple examples of anti-hrB and anti-hrB-like, and one example each of anti-V and anti-VS. Of 75 D-C+ donors, 4 (5%) typed as hrB-, and 14 others had weak or variable expression of hrB. Of these 18 individuals, 15 were V-VS+, and 3 were V+VS+. No hrB- sample was found in 90 C- donors, 26 of whom were V+VS+, and 1 was V-VS+. A review of our records of 44 hrB- patients and donors studied earlier revealed that at least 12, and possibly as many as 30, carried r or rs. All hrB- donors found in our screening program had D-C+VS+ RBCs, indicating an overrepresentation of r. Our record review also showed that the presence of r and rs more often results in hrB- RBCs, and that the most effective way to screen for hrB- donors is to type African Americans who have D-C+ RBCs.

Journal Article↗