title: Serum uric acid and outcome after acute ischemic stroke: PREMIER study.
abstract: BACKGROUND
  Current evidence shows that uric acid is a potent antioxidant whose serum concentration increases rapidly after acute ischemic stroke (AIS). Nevertheless, the relationship between serum uric acid (SUA) levels and AIS outcome remains debatable. We aimed to describe the prognostic significance of SUA in AIS.
  
  
  METHODS
  We studied 463 patients (52% men, mean age 68 years, 13% with glomerular filtration rate <60 ml/min at hospital arrival) with AIS pertaining to the multicenter registry PREMIER, who had SUA measurements at hospital presentation. Multivariate models were constructed to analyze the association of SUA with functional outcome as assessed by the modified Rankin scale (mRS) at 30-day, 3-, 6- and 12-month follow-up. A mRS 0-1 was regarded as a very good outcome.
  
  
  RESULTS
  Mean SUA concentration at hospital arrival was 6.1 ± 3.7 mg/dl (362.8 ± 220.0 μmol/l). Compared with cases with higher SUA levels at hospital admission, patients with ≤4.5 mg/dl (≤267.7 μmol/l; the lowest tertile of the sample) had more cases of a very good 30-day outcome (30.5 vs. 18.9%, respectively; p = 0.004). SUA was not associated with mortality or functional dependence (mRS >2) at 30 days, or with any outcome measure at 3, 6 or 12 months poststroke. After adjustment for age, gender, stroke type and severity (NIHSS <9), time since event onset, serum creatinine, hypertension, diabetes and smoking, a SUA ≤4.5 mg/dl (≤267.7 μmol/l) was positively associated with a very good short-term outcome (odds ratio: 1.76, 95% confidence interval: 1.05-2.95; negative predictive value: 81.1%), but not at 3, 6 or 12 months of follow-up. When NIHSS was entered in the multivariate model as a continuous variable, the independent association of SUA with outcome was lost. Compared with cases with higher levels, patients with SUA ≤4.5 mg/dl (≤267.7 μmol/l) were more frequently younger than 55 years, women, with mild strokes, with normal serum creatinine and fewer had hypertension. The time since event onset to hospital arrival was not significantly associated with AIS severity or SUA levels; nevertheless, a nonsignificant tendency was observed for patients with severe strokes and high SUA levels arriving in <24 h.
  
  
  CONCLUSIONS
  A low SUA concentration is modestly associated with a very good short-term outcome. Our findings support the hypothesis that SUA is more a marker of the magnitude of the cerebral infarction than an independent predictor of stroke outcome.
authors: Department of Neurology and Psychiatry, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico.
authors: Erwin
authors: E
authors: Chiquete
authors: José L
authors: JL
authors: Ruiz-Sandoval
authors: Luis M
authors: LM
authors: Murillo-Bonilla
authors: Antonio
authors: A
authors: Arauz
authors: Diego R
authors: DR
authors: Orozco-Valera
authors: Ana
authors: A
authors: Ochoa-Guzmán
authors: Jorge
authors: J
authors: Villarreal-Careaga
authors: Carolina
authors: C
authors: León-Jiménez
authors: Fernando
authors: F
authors: Barinagarrementeria
authors: Alma
authors: A
authors: Ramos-Moreno
authors: Carlos
authors: C
authors: Cantú-Brito
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015415:Biomarkers / Q000097:blood; D002545:Brain Ischemia / Q000097:blood* / Q000175:diagnosis / Q000503:physiopathology / Q000534:rehabilitation; D016009:Chi-Square Distribution; D004185:Disability Evaluation; D005260:Female; D006801:Humans; D033461:Hyperuricemia / Q000097:blood* / Q000175:diagnosis; D016015:Logistic Models; D008297:Male; D008800:Mexico; D008875:Middle Aged; D015999:Multivariate Analysis; D016017:Odds Ratio; D011237:Predictive Value of Tests; D011379:Prognosis; D011446:Prospective Studies; D020127:Recovery of Function; D012042:Registries; D018570:Risk Assessment; D012307:Risk Factors; D020521:Stroke / Q000097:blood* / Q000175:diagnosis / Q000503:physiopathology; D000071939:Stroke Rehabilitation; D013997:Time Factors; D014527:Uric Acid / Q000097:blood*; D055815:Young Adult
chemical_list: D015415:Biomarkers; D014527:Uric Acid