Keywords: ECG, electrocardiogram; EGFR, epidermal growth factor receptor; LVEF, left ventricular ejection fraction; NRG, neuregulin; NSCLC, non-small cell lung cancer; TKI, tyrosine kinase inhibitor; TTE, transthoracic echocardiography; cardiotoxicity; epidermal growth factor receptor; heart failure; lung cancer; osimertinib.