Diagnostic Accuracy of High-Sensitive Troponin for the Identification of Myocardial Infarction in Patients Presenting with Acute Heart Failure.

BACKGROUND: The differentiation of myocardial infarction (MI) in the setting of acute heart failure (AHF) can be challenging because the majority of patients presenting with AHF show elevations of high-sensitive troponin (hs-Tn). Fast identification of MI is crucial to perform timely coronary angiography and to improve clinical outcome. OBJECTIVES: The aim of the present study was to assess the diagnostic accuracy of different levels of hs-Tn for the identification of type 1 MI in patients with AHF. METHODS: This was a retrospective single-center analysis of admitted AHF patients with documentation of high-sensitive troponin T (hs-TnT). RESULTS: A total of 649 patients were enrolled into the present study. Of them, 18% had type 1 MI, 7% had type 2 MI, 69% had myocardial injury, and 6% had no myocardial injury. The area under the curve of hs-TnT for the prediction of type 1 MI was 0.70. Sensitivity and specificity of the hs-TnT 99th percentile upper reference limit (URL) for type 1 MI was 100% and 8%, respectively. The Youden index derived cut-off of hs-TnT was 50 ng/L, showing a sensitivity and specificity for type 1 MI of 63% and 68%, respectively. No significant difference regarding 30-day mortality was found depending on the presence of type 1 MI (odds ratio 1.86; 95% confidence interval 0.91-3.81). CONCLUSIONS: Hs-TnT-based identification of type 1 MI in patients with AHF requires higher cut-offs compared with the 99th percentile URL used in overall acute coronary syndrome populations. However, the adjusted cut-off provided only moderate sensitivity and specificity.

Prognostic impact of high-sensitive troponin on 30-day mortality in patients with acute heart failure and different classes of left ventricular ejection fraction.

High-sensitive troponin T (hs-TnT) is increasingly used for prognostication in patients with acute heart failure (AHF). However, uncertainty exists whether hs-TnT shows comparable prognostic performance in patients with heart failure and different classes of left ventricular ejection fraction (LV-EF). The aim of the present study was to assess the prognostic value of hs-TnT for the prediction of 30-day mortality depending on the presence of HF with preserved ejection fraction (HFpEF), HF with mid-range LV-EF (HFmrEF) and HF with reduced LV-EF (HFrEF) in patients with acutely decompensated HF. Patients admitted to our institution due to AHF were retrospectively included. Clinical information was gathered from electronic and paper-based patient charts. Patients with myocardial infarction were excluded. A total of 847 patients were enrolled into the present study. A significant association was found between HF groups and hs-TnT (regression coefficient -0.018 for HFpEF vs. HFmrEF/HFrEF; p = 0.02). The area under the curve (AUC) of hs-TnT for the prediction of 30-mortality was significantly lower in patients with HFpEF (AUC 0.61) than those with HFmrEF (AUC 0.80; p = 0.01) and HFrEF (AUC 0.73; p = 0.04). Hs-TnT was not independently associated with 30-day outcome in the HFpEF group (OR 1.48 [95%-CI 0.89-2.46]; p = 0.13) in contrast to the HFmrEF group (OR 4.53 [95%-CI 1.85-11.1]; p < 0.001) and HFrEF group (OR 2.58 [95%-CI 1.57-4.23]; p < 0.001). Prognostic accuracy of hs-TnT in patients hospitalized for AHF regarding 30-day mortality is significantly lower in patients with HFpEF compared to those with HFmrEF and HFrEF.

Accuracy of high-sensitive troponin depending on renal function for clinical outcome prediction in patients with acute heart failure.

High-sensitive troponin T (hs-TnT) is increasingly used for clinical outcome prediction in patients with acute heart failure (AHF). However, there is an ongoing debate regarding the potential impact of renal function on the prognostic accuracy of hs-TnT in this setting. The aim of the present study was to assess the prognostic value of hs-TnT within 6 h of admission for the prediction of 30-day mortality depending on renal function in patients with AHF. Patients admitted to our institution due to AHF were retrospectively included. Clinical information was gathered from electronic and paper-based patient charts. Patients with myocardial infarction were excluded. A total of 971 patients were enrolled in the present study. A negative correlation between estimated glomerular filtration rate (eGFR) and hsTnT was identified (Pearson r = - 0.16; p < 0.001) and eGFR was the only variable to be independently associated with hsTnT. The area under the curve (AUC) of hs-TnT for the prediction of 30-mortality was significantly higher in patients with an eGFR ≥ 45 ml/min (AUC 0.74) compared to those with an eGFR < 45 ml/min (AUC 0.63; p = 0.049). Sensitivity and specificity of the Youden Index derived optimal cut-off for hs-TnT was higher in patients with an eGFR ≥ 45 ml/min (40 ng/l: sensitivity 73%, specificity 71%) compared to patients with an eGFR < 45 ml/min (55 ng/l: sensitivity 63%, specificity 62%). Prognostic accuracy of hs-TnT in patients hospitalized for AHF regarding 30-day mortality is significantly lower in patients with reduced renal function.