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Sökning: WFRF:(Storey Robert F.) > (2010-2014)

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  • Föregående 12345[6]
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  • Åkerblom, Axel, 1977-, et al. (författare)
  • Cystatin C- and Creatinine-based Estimates of Renal Function and Their Value for Risk Prediction in Patients with Acute Coronary Syndrome : Results from the PLATelet Inhibition and Patient Outcomes (PLATO) Study
  • 2013
  • Ingår i: Clinical Chemistry. - : Oxford University Press (OUP). - 0009-9147 .- 1530-8561. ; 59:9, s. 1369-1375
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: The estimated glomerular filtration rate (eGFR) independently predicts cardiovascular (CV) death or myocardial infarction (MI), and can be estimated by creatinine and cystatin C concentrations. We evaluated two different cystatin C assays, alone or combined with creatinine, in patients with acute coronary syndromes.Methods: Plasma cystatin C, measured with assays from Gentian and Roche, and serum creatinine was analyzed in 16279 patients from the PLATelet inhibition and patient Outcomes trial. Pearson’s correlation and agreement (Bland–Altman) between methods was evaluated. Prognostic value in relation to CV death or MI during one year of follow up was evaluated by multivariable logistic regression analysis including clinical variables and biomarkers, c-statistics and relative Integrated Discrimination Improvement (IDI).Results: Median cystatin C concentrations (interquartile intervals) were 0.83 (0.68 - 1.01) mg/L (Gentian) and 0.94 (0.80 - 1.14) mg/L (Roche). Overall correlation was 0.86 (95% confidence interval 0.85-0.86). The level of agreement was ±0.39mg/L (±2 standard deviations) (n=16279).The area under curve (AUC) in the multivariable risk prediction model with cystatin C (Gentian, Roche) or Chronic Kidney Disease - Epidemiology (CKD-EPI) added was 0.6914, 0.6913 and 0.6932. Corresponding relative IDIs were 2.96%, 3.86% and 4.68%, respectively (n=13050). Addition of eGFR by the combined creatinine-cystatin C equation yielded AUC of 0.6923(Gentian) and 0.6924(Roche) with relative IDIs of 3.54% and 3.24% respectively.Conclusions: Despite differences in cystatin C concentrations, overall correlation between the Gentian and Roche assays was good while agreement was moderate.  The combined creatinine-cystatin C equation did not outperform risk prediction compared to CKD-EPI.
  • Åkerblom, Axel, 1977-, et al. (författare)
  • Cystatin C and Estimated Glomerular Filtration Rate as Predictors for Adverse Outcome in Patients with ST-Elevation and Non-ST-Elevation Acute Coronary Syndromes : Results from the Platelet Inhibition and Patient Outcomes Study
  • 2012
  • Ingår i: Clinical Chemistry. - : Oxford University Press (OUP). - 0009-9147 .- 1530-8561. ; 58:1, s. 190-199
  • Tidskriftsartikel (refereegranskat)abstract
    • BACKGROUND:We evaluated the predictive ability of cystatin C and creatinine-based estimations of glomerular filtration rate (eGFR), including the Chronic Kidney Disease-Epidemiology (CKD-EPI) equation, in acute coronary syndrome (ACS) patients with (STE-ACS) or without (NSTE-ACS) ST elevation in a large contemporary ACS population.METHODS:Concentrations of cystatin C and creatinine, as well as eGFR at randomization, were measured in 16 401 patients in the Platelet Inhibition and Patient Outcomes (PLATO) study and evaluated as predictors of the composite end point of cardiovascular death or myocardial infarction within 1 year. Two Cox proportional hazards models were used, the first adjusting for clinical characteristics and the second for clinical characteristics plus the biomarkers N-terminal pro-B-type natriuretic peptide, troponin I, and C-reactive protein.RESULTS:The median cystatin C value was 0.83 mg/L. Increasing quartiles of cystatin C were strongly associated with poor outcome (6.9%, 7.1%, 9.5%, and 16.2%). The fully adjusted hazard ratios per SD of cystatin C in the NSTE-ACS and STE-ACS populations were 1.12 (95% CI 1.04-1.20) (n = 8053) and 1.06 (95% CI 0.97-1.17) (n = 5278), respectively. There was no significant relationship of cystatin C with type of ACS (STE or NSTE). c Statistics ranged from 0.6923 (cystatin C) to 0.6941 (CKD-EPI).CONCLUSIONS:Cystatin C concentration contributes independently in predicting the risk of cardiovascular death or myocardial infarction in NSTE-ACS, with no interaction by type of ACS. CKD-EPI exhibited the largest predictive value of all renal markers. Nevertheless, the additive predictive value of cystatin C or creatinine-based eGFR measures in the unselected ACS patient is small.
  • Åkerblom, Axel, 1977-, et al. (författare)
  • Polymorphism of the cystatin C gene in patients with acute coronary syndromes : Results from the PLATelet Inhibition and Patient Outcomes (PLATO) Study
  • 2014
  • Ingår i: American Heart Journal. - : Elsevier BV. - 0002-8703 .- 1097-6744. ; 168:1, s. 96-102
  • Tidskriftsartikel (övrigt vetenskapligt)abstract
    • Purpose: Plasma cystatin C is independently associated with cardiovascular (CV) risk in non-ST-elevation acute coronary syndromes (NSTE-ACS). The effect of genetic variability on cystatin C concentrations and outcome is unclear.Methods: Plasma cystatin C concentrations were measured in blood, obtained within 24 hours of admission, in 16279 ACS patients from the PLATelet inhibition and patient Outcomes trial. 9978 patients were genome-wide genotyped with up to 2.5 million SNPs. The first occurrence of CV death or myocardial infarction (MI) within one year was evaluated by multivariable (clinical variables and biomarkers) Cox regression analysis and c-statistics both overall (all ACS) and in NSTE-ACS.Results: We observed SNPs association with cystatin C levels (up to p=7.82 x 10-16). The most significant SNP (rs6048952) was adjacent the CST3 gene with additive effect on cystatin C concentrations: 0.85mg/L, 0.80mg/L and 0.73mg/L for the A/A, A/G and G/G genotypes respectively. Multivariable c-statistics regarding the combined endpoint (CV death or MI) was 0.6619. Adding cystatin C concentrations or genetically adjusted cystatin C levels, exhibited c-statistics of 0.6705 and 0.6703, respectively.The overall hazard ratio for rs6048952 was 0.93 (95%CI 0.82-1.04) regarding the CV death or MI while 0.85 (95%CI 0.70-1.03) regarding CV death in all ACS patients. In the NSTE-ACS subgroup, the hazard ratio for rs6048952 was 0.72 (95%CI 0.54-0.95).Conclusions: Genetic polymorphism, independently of kidney function, affects cystatin C concentrations, but does not appear to influence ischemic outcome in an overall ACS population. However, genetic variation appears to affect cardiovascular mortality in moderate-to-high risk NSTE-ACS patients.
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  • Föregående 12345[6]
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