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Glycated haemoglobin and long-term mortality in patients with ST Elevation Myocardial Infarction

Chiara Lazzeri1, Serafina Valente, Marco Chiostri

  • 1Intensive Cardiac Coronary Unit, Heart and Vessel Department, Azienda, Ospedaliero-Universitaria Careggi, Florence, Italy.

Journal of Cardiovascular Medicine (Hagerstown, Md.)
|June 17, 2014
PubMed

Insights

Increased HbA1c (glycated hemoglobin) levels did not predict 1-year mortality in ST Elevation Myocardial Infarction (STEMI) patients undergoing primary percutaneous coronary intervention (PCI). However, undiagnosed diabetes indicated by HbA1c ≥6.5% was linked to reduced survival post-PCI.

Area of Science:

  • Cardiology
  • Endocrinology
  • Clinical Research

Background:

  • Elevated HbA1c (glycated hemoglobin) is a marker for diabetes and glycemic control.
  • ST Elevation Myocardial Infarction (STEMI) is a critical cardiovascular event.
  • Primary percutaneous coronary intervention (PCI) is a standard treatment for STEMI.

Purpose of the Study:

  • To assess the impact of increased HbA1c (≥6.5%) on 1-year mortality in STEMI patients treated with primary PCI.
  • To differentiate outcomes based on known diabetes status and HbA1c levels.

Main Methods:

  • A cohort of 1205 STEMI patients treated with primary PCI was analyzed.
  • Patients were categorized into three groups based on diabetes diagnosis and HbA1c levels.
  • Cox regression and Kaplan-Meier survival analyses were performed.

Main Results:

  • HbA1c ≥6.5% was not associated with 1-year mortality in patients with or without previously diagnosed diabetes.
  • Patients with previously diagnosed diabetes (Group A) had the lowest survival rate.
  • Patients without previously known diabetes but with HbA1c ≥6.5% (Group B) showed significantly reduced survival starting 6 months post-discharge.

Conclusions:

  • In STEMI patients undergoing primary PCI, HbA1c levels were not independently related to outcomes via multivariable analysis.
  • Undiagnosed hyperglycemia (HbA1c ≥6.5%) in non-diabetic STEMI patients may indicate a higher mortality risk.
  • Further investigation into the prognostic significance of hyperglycemia in STEMI patients without prior diabetes diagnosis is warranted.
Abstract

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