High Sensitivity Troponin in Infarcted Patients with History of Myocardial In-farction

Design of the Study: Historical Cohort.

Objectives: This study aimed to verify which risk factors contribute to increase hs-cTnI in patients with Myocardial Infarcion with ST segment elevation, to ana-lyze which prognostic impacts it may have and to evaluate troponin levels in pa-tients that had previous acute myocardial infarction and assess how this com-pared to patients without previous history of an acute event.

Methodology: It was assessed medical records of patients admitted in the Cor-onary Unit of the Hospital de Clínicas (HC-UFPR) in Curitiba, South of Brazil, diagnosed with ST segment elevation Myocardial Infarction and whose serum levels of high sensitivity troponin I (hs-cTnI) were collected at admission moment. The select data were: gender, age, high blood pressure, smoking, diabetes, previous myocardial infarction, dyslipidemia and serum levels of high sensitivity troponin I. For prognostic proposes, it was analysed intra-hospital death and ventricular function, based on left ventricular ejection fraction.

Findings: Patients admitted with previous myocardial infarction had lower levels of hs-TnI. Gender, age, presence of high blood pressure, tabagism, diabetes and dyslipidemia didn’t reveal correlation with troponin values, allowing the in-ference that high sensitivity troponin values at first presentation of these patients have no direct relation to these variables. Regarding prognosis, levels of high sensitivity troponin could not be associated to mortality or ventricular malfunction.

Conclusions: At admission, high-sensitivity troponin I levels were lower in pa-tients with prior myocardial infarction.

Relevance: This work correlates the values of the high-sensitivity troponin of patients with ST segment Elevation Myocardial Infarction to cardiovascular risks factors and to the prognosis of these patients. This approach is not found in cur-rent medical literature, whose works mainly relates to acute events.