title: Incidence and severity of early electrolyte abnormalities following autologous haematopoietic stem cell transplantation.
abstract: BACKGROUND
  Haematopoietic stem cell transplantation (HSCT) has gained worldwide acceptance as a therapeutic option for many haematological and non-haematological conditions. Local experience supports that electrolyte abnormalities are quite common; however, the incidence and timing of these abnormalities are unknown.
  
  
  METHODS
  We conducted a retrospective descriptive study of 48 consecutive adult patients in order to study the incidence and the timing of electrolyte abnormalities following autologous HSCT. Clinical and pharmacological data were collected by the review of patient charts. Potassium, magnesium, calcium, phosphorus and albumin levels were retrieved from the laboratory.
  
  
  RESULTS
  HSCT was performed for multiple myeloma (28/48), lymphoma (8/48), Hodgkin disease (4/48), amyloidosis (4/48) and other neoplasia (4/48). At baseline, 21% of patients (10/48) had low electrolyte levels. Following autologous HSCT, hypokalaemia occurred in 81% (39/48), hypomagnesaemia in 67% (32/48), hypocalcaemia in 49% (17/35) and hypophosphataemia in 91% (39/43) of the patients. The nadir of the electrolyte levels occurred between day 8 and 10 after stem cell transplant while the engraftment occurred at day 11.6+/-0.6. The use of amphotericin B and furosemide was associated with more pronounced hypokalaemia and hypomagnesaemia. Hypocalcaemia was more pronounced in patients with multiple myeloma. High levels of electrolytes occurred in only 25% of the patients, none of which required specific treatment.
  
  
  CONCLUSIONS
  We conclude that low electrolyte levels are extremely common after HSCT and the pathophysiology of these abnormalities are complex and multifactorial.
authors.affiliation: Division of Nephrology, Centre Hospitalier Universitaire de Québec, Hôtel-Dieu de Québec Hospital, Department of Medicine, Laval University, Québec, Canada . mohsen.agharazii@crhdq.ulaval.ca
authors.forename: David
authors.initials: D
authors.lastname: Philibert
authors.forename: Simon
authors.initials: S
authors.lastname: Desmeules
authors.forename: Alain
authors.initials: A
authors.lastname: Filion
authors.forename: Mireille
authors.initials: M
authors.lastname: Poirier
authors.forename: Mohsen
authors.initials: M
authors.lastname: Agharazii
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D018380:Hematopoietic Stem Cell Transplantation / Q000009:adverse effects*; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012720:Severity of Illness Index; D013997:Time Factors; D014883:Water-Electrolyte Imbalance / Q000453:epidemiology* / Q000209:etiology*