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Evaluating the systemic immune-inflammation index for in-hospital and long-term mortality in elderly non-ST-elevation myocardial infarction patients

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Abstract

Introduction

This investigation aimed to evaluate the predictive value of the systemic immune-inflammation index (SII) for in-hospital and long-term mortality in elderly patients with non-ST-elevation myocardial infarction (NSTEMI).

Methods

This retrospective investigation included 314 consecutive elderly NSTEMI patients in a tertiary center. SII is computed as (neutrophils × platelets)/lymphocytes. Based on the increased SII values, we classified the research sample into three tertile groups as T1, T2, and T3. The in-hospital and long-term mortality were defined as the primary outcomes.

Results

Patients in the T3 group had lower chances of survival in the in-hospital and long-term periods compared with those in the T2 and T1 groups. According to the multivariable Cox regression models, SII independently related with in-hospital (hazard ratio (HR): 1.001, 95% CI: 1.000–1.1003, p = 0.038) and long-term mortality (HR: 1.004, 95% CI: 1.002–1.006, p < 0.001). To predict long-term mortality, the optimal SII value was > 2174 with 80% sensitivity and 85.4% specificity. SII had a slightly lower but statistically non-inferior discriminative ability for long-term mortality compared with the Charlson comorbidity index (CCI) in the receiver operating characteristic curve comparison (AUC: 86.2 vs. AUC: 890, p > 0.05). Additionally, combining SII with traditional risk factors and the CCI revealed a significant improvement in C-statistics.

Conclusion

This investigation may be the first to demonstrate that SII is independently linked with in-hospital and long-term mortality in elderly NSTEMI patients.

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Authors and Affiliations

  1. Department of Cardiology, Health Sciences University, Sultan II. Abdulhamid Han Training and Research Hospital, Tibbiye Street, Uskudar, 34668, Istanbul, Turkey

    Ahmet Lütfullah Orhan, Vedat Çiçek, Murat Selçuk & Tufan Çınar

  2. Department of Cardiology, Van Training and Research Hospital, Van, Turkey

    Faysal Şaylık & Tayyar Akbulut

Authors
  1. Ahmet Lütfullah Orhan
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  2. Faysal Şaylık
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  3. Vedat Çiçek
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  4. Tayyar Akbulut
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  5. Murat Selçuk
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  6. Tufan Çınar
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Corresponding author

Correspondence to Tufan Çınar.

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Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The design of the study was approved by the Local Ethics Committee (Decision number: 2021/23).

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This article does not contain any studies with animals performed by any of the authors.

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Informed consent was not needed to due the retrospective design of the study.

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Not applicable. The study had a retrospective design.

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Orhan, A.L., Şaylık, F., Çiçek, V. et al. Evaluating the systemic immune-inflammation index for in-hospital and long-term mortality in elderly non-ST-elevation myocardial infarction patients. Aging Clin Exp Res 34, 1687–1695 (2022). https://doi.org/10.1007/s40520-022-02103-1

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  • DOI: https://doi.org/10.1007/s40520-022-02103-1

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