The document discusses three studies comparing primary angioplasty versus fibrinolysis for heart attack patients. The first study randomized 395 patients to either angioplasty or treatment with streptokinase fibrinolysis. The second study randomized 1572 patients to angioplasty or treatment with alteplase fibrinolysis. The third study from 2011 examined how long angioplasty could be delayed after fibrinolysis treatment compared. The document concludes with a reference to the 2013 ESC-SEC guidelines for heart attack patients.