To investigate the prognostic significance of a fragmented QRS (fQRS) complex in a patient who had undergone primary percutaneous coronary intervention (PCI).

Inclusion Criteria:

• Patients with chest pain that continued longer than 30 minutes and with ≥ 2 mm ST elevation in ECG at least in two adjacent derivations were diagnosed with an acute STEMI. In all patients, at least two-fold increases were seen in serum CK-MB levels compared to normal values.Having acute STEMI for the first time was stipulated for inclusion in the study.

Exclusion Criteria:

• Subjects with known allergies to aspirin and clopidogrel, inadequate echocardiographic images, malignancy, a previous cerebrovascular event, renal dysfunction (creatine level > 2.5 mg/dl), a previous MI, or a history of cardiogenic shock as well as those who refused to participate in the study were excluded.

patients who presented to the hospital within 12 hours of the onset of chest pain who were admitted to the coronary intensive care unit (ICU) with the diagnosis of acute STEMI and who were administered primary PCI. Having acute STEMI for the first time was stipulated for inclusion in the study.