Sixty consecutive patients with a first anterior STEMI , who underwent primary percutaneous coronary intervention 2-12 h after symptom onset , with LV ejection fraction ( LVEF ) 45 % measured by echocardiography within 12 h after successful revascularisation ( TIMI flow score 2 ) , were randomised 1:1 to G-CSF ( 5 g/Kg body weight b.i.d. ) or placebo .