Association between admission blood glucose and prognosis in non-diabetic patients with first-ever acute myocardial infarction

Background: Admission hyperglycemia has been associated with major adverse cardiovascular and cerebrovascular events (MACCEs) in patients with acute coronary syndrome. Methods: In this study we sought to determine the association between admission blood sugar (ABS) and the outcomes of non-diabetic patients with first-ever acute myocardial infarction (MI). Non-diabetic patients with MI were evaluated from March 2016 to March 2019. Baseline characteristics, laboratories, electrocardiogram, and baseline left ventricular ejection fraction (LVEF) were recorded. All patients were followed up and outcomes were obtained. Follow-up data comprised of repeating electrocardiogram and echocardiography at 1 year, and MACCE, including re-MI, stroke, and mortality. Results: A total of 312 patients with a mean age of 54.2 ± 11.9 years were evaluated. All patients were followed up for a median of 38 months. The frequencies of in-hospital mortality and MACCE at late follow-up were higher in third tertile of ABS compared with those in first and second tertiles (both p <0.05). Based on the Cox regression analysis, the independent predictors of MACCE included age (hazard ratio [HR] 1.068, 95% confidence interval [CI] 1.033 – 1.105, p <0.001), third tertile of ABS >172 mg/dL (HR 21.257, 95% CI 2.832 – 159.577, p=0.003), and baseline LVEF (HR 0.947, 95% CI 0.901 – 0.995, p=0.031). Conclusion: Admission stress hyperglycemia is associated with increased rates of in-hospital mortality and MACCE at late follow-up in non-diabetic patients with MI. Moreover, elevated ABS, older ages, and a decreased value of baseline LVEF predicted MACCE during follow-up.