title: Citrate metabolism and its complications in non-massive blood transfusions: association with decompensated metabolic alkalosis+respiratory acidosis and serum electrolyte levels.
abstract: OBJECTIVE
  Metabolic alkalosis, which is a non-massive blood transfusion complication, is not reported in the literature although metabolic alkalosis dependent on citrate metabolism is reported to be a massive blood transfusion complication. The aim of this study was to investigate the effect of elevated carbon dioxide production due to citrate metabolism and serum electrolyte imbalance in patients who received frequent non-massive blood transfusions.
  
  
  METHODS
  Fifteen inpatients who were diagnosed with different conditions and who received frequent blood transfusions (10-30 ml/kg/day) were prospectively evaluated. Patients who had initial metabolic alkalosis (bicarbonate>26 mmol/l), who needed at least one intensive blood transfusion in one-to-three days for a period of at least 15 days, and whose total transfusion amount did not fit the massive blood transfusion definition (<80 ml/kg) were included in the study.
  
  
  RESULTS
  The estimated mean total citrate administered via blood and blood products was calculated as 43.2 ± 34.19 mg/kg/day (a total of 647.70 mg/kg in 15 days). Decompensated metabolic alkalosis+respiratory acidosis developed as a result of citrate metabolism. There was a positive correlation between cumulative amount of citrate and the use of fresh frozen plasma, venous blood pH, ionized calcium, serum-blood gas sodium and mortality, whereas there was a negative correlation between cumulative amount of citrate and serum calcium levels, serum phosphorus levels and amount of urine chloride.
  
  
  CONCLUSIONS
  In non-massive, but frequent blood transfusions, elevated carbon dioxide production due to citrate metabolism causes intracellular acidosis. As a result of intracellular acidosis compensation, decompensated metabolic alkalosis+respiratory acidosis and electrolyte imbalance may develop. This situation may contribute to the increase in mortality. In conclusion, it should be noted that non-massive, but frequent blood transfusions may result in certain complications.
authors.affiliation: Dr. Abdurrahman Yurtaslan Ankara Oncology Training and Research Hospital, Unit of Pediatric Hematology, Demetevler, Ankara, Turkey. Electronic address: zaferbicakcib@yahoo.com.tr.
authors.forename: Zafer
authors.initials: Z
authors.lastname: Bıçakçı
authors.affiliation: Dr. Abdurrahman Yurtaslan Ankara Oncology Training and Research Hospital, Unit of Pediatric Hematology, Demetevler, Ankara, Turkey. Electronic address: laleolcay@hotmail.com.tr.
authors.forename: Lale
authors.initials: L
authors.lastname: Olcay
mesh_terms: D000138:Acidosis / Q000097:blood* / Q000209:etiology / Q000652:urine; D000293:Adolescent; D000471:Alkalosis / Q000097:blood* / Q000209:etiology / Q000652:urine; D002648:Child; D002675:Child, Preschool; D019343:Citric Acid / Q000097:blood* / Q000652:urine; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D011446:Prospective Studies; D065227:Transfusion Reaction; D014882:Water-Electrolyte Balance
chemical_list: D019343:Citric Acid
keywords: Carbon dioxide; Citrate metabolism; Electrolyte imbalance; Metabolic alkalosis; Respiratory acidosis