Background: RISK-PCI score is a novel score for risk stratification of patients with ST elevation myocardial infarction (STEMI) treated by primary percutaneous coronary intervention (pPCI). The aim of this study was to evaluate the role of B-type natriuretic peptide (BNP) and the RISK-PCI score for early risk assessment in patients with STEMI treated by pPCI.
Methods: In 120 patients with STEMI treated by pPCI, BNP was measured on admission before pPCI. The primary end point was 30-day mortality.
Results: The ROC curve analysis revealed that the most powerful predictive factors of 30-day mortality were the plasma level of BNP ≥ 206.6 pg/mL with the sensitivity of 75% and specificity of 87.5% and the RISK-PCI score ≥ 5.25 with the sensitivity of 75% and specificity of 85.7%. Thirty-day mortality was 6.7%. After multivariate adjustment, admission BNP (≥ 206.6 pg/mL) (OR 2.952, 95% CI 1.072 - 8.133, p = 0.036) and the RISK-PCI score (≥ 5.25) (OR 2.284, 95% CI 1.140-4.578, p = 0.020) were independent predictors of 30-day mortality. The area under the ROC curve using the RISK-PCI score and BNP to detect mortality was 0.828 (p = 0.002) and 0.903 (p < 0.001), respectively. Addition of BNP to RISK-PCI score increased the area under the ROC to 0.949 (p < 0.001), but this increase measured by the c-statistic was not significant (p = 0.107). Furthermore, the significant improvement in risk reclassification (p < 0.001) and the integrated discrimination index (p = 0.042) were observed with the addition of BNP to RISK-PCI score for 30-day mortality.
Conclusions: BNP on admission and the RISK-PCI score were the independent predictors of 30-day mortality in patients with the STEMI treated by pPCI. BNP in combination with the RISK-PCI score showed the way to more accurate risk assessment in patients with STEMI treated by pPCI.