title: Cholesterol levels and risk of hemorrhagic transformation after acute ischemic stroke.
abstract: BACKGROUND
  The association between cholesterol levels and hemorrhagic transformation (HT) is still controversial. Studies investigating this issue are influenced by treatments as some are characterized by a higher risk of HT. The aim of our study was to evaluate, in a hospital-based series of patients not treated with thrombolysis, the relationship between cholesterol levels and HT.
  
  
  METHODS
  We retrospectively collected information about total cholesterol (TC) and low-density lipoprotein cholesterol (LDLC) levels at admission in a consecutive series of 240 patients with anterior ischemic stroke (IS). The TC and LDLC levels were arranged in 3 groups according to their percentile distribution.
  
  
  RESULTS
  TC levels were available for 215 patients (89.6%), while LDLC levels were available for 184 patients (76.7%). The risk of HT significantly increased with decreasing levels of TC (p for trend = 0.03) and LDLC (p for trend = 0.01). In multivariate analysis, the risk of HT was significantly higher in the groups of patients with the lowest TC (OR 2.8, 95% CI 1.0-8.9, p = 0.05) and LDLC (OR 5.0, 95% CI 1.2-20.1, p = 0.002) values compared to those with the highest ones.
  
  
  CONCLUSIONS
  We confirm that lower TC and lower LDLC levels are associated with an increased risk of HT. As none of our patients received thrombolytic therapy, the results of our study provide baseline information about the natural history of HT.
authors.affiliation: Dipartimento di Biomedicina Sperimentale e Neuroscienze Cliniche, University of Palermo, Palermo, Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: D'Amelio
authors.forename: Valeria
authors.initials: V
authors.lastname: Terruso
authors.forename: Giorgia
authors.initials: G
authors.lastname: Famoso
authors.forename: Paolo
authors.initials: P
authors.lastname: Ragonese
authors.forename: Paolo
authors.initials: P
authors.lastname: Aridon
authors.forename: Giovanni
authors.initials: G
authors.lastname: Savettieri
mesh_terms: D000368:Aged; D015415:Biomarkers / Q000097:blood; D002545:Brain Ischemia / Q000097:blood / Q000150:complications*; D016009:Chi-Square Distribution; D002784:Cholesterol / Q000097:blood*; D008078:Cholesterol, LDL / Q000097:blood*; D018450:Disease Progression; D015536:Down-Regulation; D005260:Female; D006801:Humans; D020300:Intracranial Hemorrhages / Q000097:blood / Q000209:etiology*; D007558:Italy; D016015:Logistic Models; D008297:Male; D016017:Odds Ratio; D011379:Prognosis; D012189:Retrospective Studies; D018570:Risk Assessment; D012307:Risk Factors; D020521:Stroke / Q000097:blood / Q000150:complications*
chemical_list: D015415:Biomarkers; D008078:Cholesterol, LDL; D002784:Cholesterol