The present study aimed to investigate the in‑hospital and long-term prognostic value of fragmented QRS complex (fQRS) for microvascular reperfusion and changes in left ventricular (LV) function in patients with ST elevation myocardial infarction (STEMI) who underwent primary percutaneous coronary intervention (PCI). A total of 216 patients with STEMI undergoing primary PCI were included in the current study. Patients were divided into two groups based on the presence (n=126) or absence (n=90) of fQRS following electrocardiograms (ECGs) on admission. Following primary PCI and follow up, patients were divided into four groups based on new onset, resolution, persistence and absence of fQRS. Major adverse cardiac events were defined to include cardiovascular death, arrhythmia, heart failure, reinfarction and target vessel revascularization. The percentage of patients with heart failure and microvascular reperfusion differed significantly between the fQRS(+) and fQRS(‑) groups. Levels of N‑terminal pro‑brain natriuretic peptide (NT‑proBNP), Peak creatine kinase‑MB (CK‑MB) and Troponin I levels were observed to be significantly higher in the fQRS(+) group compared with the fQRS(‑) group. In univariate logistic regression analysis, left ventricular ejection fraction (LVEF), NT‑proBNP, Troponin I, Peak CK‑MB and microvascular reperfusion were found to be associated with fQRS. Multivariate analysis identified that LVEF, NT‑proBNP, Troponin I and microvascular reperfusion may be independent predictors of fQRS. The presence of fQRS was demonstrated to be associated with left ventricular dysfunction at follow up assessments. The presence of fQRS was not only significantly associated with myocardial microvascular reperfusion and left ventricular function, but was also a prognostic marker in STEMI.

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