External validation of the GRACE risk score and the risk-treatment paradox in patients with acute coronary syndrome

Niels M. R. van der Sangen, Jaouad Azzahhafi, Dean R. P. P. Chan Pin Yin, Joyce Peper, Senna Rayhi, Ronald J. Walhout, Melvyn Tjon Joe Gin, Deborah M. Nicastia, Jorina Langerveld, Georgios J. Vlachojannis, Rutger J. van Bommel, Yolande Appelman, José P. S. Henriques, Jurriën M. ten Berg, Wouter J. Kikkert

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Abstract

Objectives To validate the Global Registry of Acute Coronary Events (GRACE) risk score and examine the extent and impact of the risk-treatment paradox in contemporary patients with acute coronary syndrome (ACS). Methods Data from 5015 patients with ACS enrolled in the FORCE-ACS registry between January 2015 and December 2019 were used for model validation. The performance of the GRACE risk score for predicting in-hospital and 1-year mortality was evaluated based on indices of model discrimination and calibration. Differences in the delivery of guideline-recommended care among patients who survived hospitalisation (n=4911) per GRACE risk stratum were assessed and the association with postdischarge mortality was examined. Results Discriminative power of the GRACE risk score was good for predicting in-hospital (c-statistic: 0.86; 95% CI: 0.83 to 0.90) and 1-year mortality (c-statistic: 0.82; 95% CI: 0.79 to 0.84). However, the GRACE risk score overestimated the absolute in-hospital and 1-year mortality risk (Hosmer-Lemeshow goodness-of-fit test p<0.01). Intermediate-risk and high-risk patients were 12% and 29% less likely to receive optimal guideline-recommended care compared with low-risk patients, respectively. Optimal guideline-recommended care was associated with lower mortality in intermediate- and high-risk patients. Conclusions The GRACE risk score identified patients at higher risk for in-hospital and 1-year mortality, but overestimated absolute risk levels in contemporary patients. Optimal guideline-recommended care was associated with lower mortality in intermediate-risk and high-risk patients, but was less likely to be delivered with increasing mortality risk.

Original languageEnglish
Article numbere001984
JournalOpen Heart
Volume9
Issue number1
DOIs
Publication statusPublished - 1 Mar 2022

Keywords

  • Acute coronary syndrome
  • Clinical
  • Myocardial infarction
  • Pharmacology

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