Abstract:Objective To evaluate the relation between fragmented QRS (fQRS) and syntax score Ⅱ (SS Ⅱ) in patients with ST elevation myocardial infarction (STEMI) treated with PCI. Methods This study enrolled 84 STEMI patients treated with percutaneous coronary intervention (PCI). The standard 12-lead electrocardiograms (ECG) were obtained from all patients before and after PCI. SS and SS Ⅱ were calculated in all patients. Transthoracic echocardiography was performed to all patients. Results Twenty patients (23.8%) had fQRS on their ECGs. The median SS Ⅱ was 27 (22.9 ~ 33.8). SS Ⅱ values in the fQRS (+) group were significantly higher than that in the fQRS (?) group (35.3 VS 25.8, P < 0.05). Also, in patients with higher SS Ⅱ, there was significantly higher number of fQRS leads on ECGs. Conclusions The presence of fQRS and high number of fQRS leads on ECG may be associated with high SS Ⅱ in STEMI patients treated with PCI.