title: Acute gram-negative urosepsis mimicking an acute hemolytic transfusion reaction.
abstract: BACKGROUND
  The acute hemolytic transfusion reaction (AHTR) is one of the most feared complications of blood transfusion. Over the years, several clinical conditions, as well as errors in blood component preparation and administration, that mimic AHTR have been identified. This report describes a novel variation on the theme of pseudo-AHTR.
  
  
  METHODS
  A 47-year-old diabetic man with drug-induced pancytopenia suddenly manifested severe shaking chills, flank pain, and back pain during a red cell transfusion. The passage of bright red urine immediately after the transfusion virtually confirmed for the clinicians administering the transfusion that an AHTR had occurred. In the laboratory, the hematuria was shown to be due principally to red cells and not to free hemoglobin. Further posttransfusion work-up showed a urinary tract infection and overwhelming bacterial sepsis with Escherichia coli.
  
  
  CONCLUSIONS
  As a pseudo-AHTR, gram-negative bacterial sepsis of urinary tract origin may surpass other forms of sepsis. Urosepsis should be considered in the work-up of a suspected AHTR in a pancytopenic patient with a urinary tract infection.
authors.affiliation: Department of Pathology and Laboratory Medicine, Veterans Affairs Medical Center, Syracuse, New York, USA.
authors.forename: H D
authors.initials: HD
authors.lastname: Friedman
authors.forename: M
authors.initials: M
authors.lastname: Noonan
mesh_terms: D000208:Acute Disease; D016905:Gram-Negative Bacterial Infections / Q000175:diagnosis*; D006461:Hemolysis; D006801:Humans; D008297:Male; D008875:Middle Aged; D065227:Transfusion Reaction; D014552:Urinary Tract Infections / Q000175:diagnosis*