title: Is anaemia a risk factor for delirium in an acute geriatric population?
abstract: OBJECTIVE
  Delirium is a common clinical problem in elderly patients. We aim to investigate whether anaemia is a risk factor for delirium in a hospitalized geriatric population.
  
  
  METHODS
  During a 5-month prospective study, we investigated 190 elderly patients aged 70 years and older with a baseline Mini-Mental State Examination (short version), Confusion Assessment Method, demographic, clinical and laboratory data.
  
  
  RESULTS
  Thirty-four patients were identified as delirious and 95 as anaemic according to the WHO criteria. Stepwise logistic regression revealed that anaemia (haemoglobin level <12 g/l in women and <13 g/l in men), male sex and a diagnosis of dementia were independent risk factors for delirium in the total study group. After adjustment for sex, age, diagnosis of dementia and dehydration, the odds ratio (OR) for anaemia (2.4; 95 CI = 1.02-5.54) remained significantly associated with delirium. When the study population was classified in groups according to sex, anaemia remained a significant risk factor for delirium in men (OR = 3.7; 95% CI = 1.03-15.6) after adjustment for the multiple variables but not in women (OR = 1.54; 95% CI = 0.48-4.9). When the haemoglobin levels were stratified into sex-specific quartiles, the adjusted OR for delirium for men with a haemoglobin level less than 11.1 g/dl was 13.1 (95% CI = 1.17-146).
  
  
  CONCLUSIONS
  Anaemia is an independent risk factor for delirium and adds valuable information to previously validated predictive models in men but not in women and lower haemoglobin levels were associated with higher risk levels.
authors.affiliation: Department of Internal Medicine, Division of Geriatric Medicine, University Hospitals K.U. Leuven, Leuven, Belgium. etienne.joosten@uz.kuleuven.ac.be
authors.forename: Etienne
authors.initials: E
authors.lastname: Joosten
authors.forename: Joke
authors.initials: J
authors.lastname: Lemiengre
authors.forename: Tine
authors.initials: T
authors.lastname: Nelis
authors.forename: Geert
authors.initials: G
authors.lastname: Verbeke
authors.forename: Koen
authors.initials: K
authors.lastname: Milisen
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000740:Anemia / Q000150:complications*; D003693:Delirium / Q000097:blood* / Q000209:etiology*; D005260:Female; D006454:Hemoglobins / Q000032:analysis*; D006801:Humans; D007297:Inpatients / Q000523:psychology*; D008297:Male; D008609:Mental Status Schedule; D016017:Odds Ratio; D011446:Prospective Studies; D012307:Risk Factors
chemical_list: D006454:Hemoglobins