In this video, Dr. Viveka Kumar, Senior Director - Cath Lab, Max Super Speciality Hospital, Saket, will talk about the therapeutic window in acute MI, in this video. The first three hours are the golden hours. Up to six hours, the patient should be treated with thrombolysis and primary PTCA. Beyond six hours to twelve hours, primary PTCA should be done in patients who did not had any treatment options or a pharmaco-invasive strategy is done. He will explain that beyond 12 hours, the window period is lost and patient should be treated medically unless the patient has a chest pain or has gone into cardiogenic shock. The first three hours are the best period for the treatment.