title: Blood transfusion in late anemia of prematurity: effect on oxygen consumption, heart rate, and weight gain in otherwise healthy infants.
abstract: BACKGROUND
  In premature infants there is no universally accepted definition of anemia requiring transfusion. We designed the present investigation to study the effects of red blood cell transfusion (based on simple transfusion rules) on weight gain, energy metabolism, and heart rate in otherwise healthy preterm infants.
  
  
  METHODS
  We measured oxygen consumption (VO2), respiratory quotient (RQ) and energy expenditure (EE) by 4-hour indirect calorimetry, and assessed weight gain over 7 days and heart rate in 12 infants with late anemia of prematurity before and after red blood cell transfusion (10 ml/kg). At the time of transfusion, postmenstrual age was 38 +/- 1 weeks (mean +/- SEM), body weight 2.14 +/- 0.13 kg, and hemoglobin concentration 7.7 +/- 0.3 g/dl (range: 5.5-9.2).
  
  
  RESULTS
  Red blood cell transfusion increased the hemoglobin concentration by 3.8 +/- 0.5 g/dl, but had no significant effect on weight gain (15.4 +/- 2.4 vs. 13.8 +/- 1.8 g/kg/day), VO2 (8.7 +/- 0.3 vs. 8.7 +/- 0.3 ml/kg/min), minimal VO2 (7.2 +/- 0.3 vs. 7.7 +/- 0.4 ml/kg/min), RQ (0.96 +/- 0.02 vs. 0.95 +/- 0.02), EE (50 +/- 2 vs. 51 +/- 2 kcal/kg/day), and heart rate (160 +/- 3 vs. 158 +/- 3 min-1).
  
  
  CONCLUSIONS
  We conclude that oxygen supply and energy metabolism were not compromised in the anemic preterm infants at the time of red blood cell transfusion.
authors.affiliation: Abteilung Neonatologie, Universitätskinderklinik Heidelberg, FRG.
authors.forename: T
authors.initials: T
authors.lastname: Böhler
authors.forename: A
authors.initials: A
authors.lastname: Janecke
authors.forename: O
authors.initials: O
authors.lastname: Linderkamp
mesh_terms: D000751:Anemia, Neonatal / Q000097:blood / Q000628:therapy*; D002302:Cardiac Output / Q000502:physiology; D004734:Energy Metabolism / Q000502:physiology; D017707:Erythrocyte Transfusion; D005260:Female; D005500:Follow-Up Studies; D006339:Heart Rate / Q000502:physiology*; D006452:Hemoglobinometry; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007235:Infant, Premature, Diseases / Q000097:blood / Q000628:therapy*; D008297:Male; D010100:Oxygen / Q000097:blood*; D015430:Weight Gain / Q000502:physiology*
chemical_list: D010100:Oxygen