Dr. K K Aggarwal, President Heart Care Foundation of India and Group Editor in Chief MEDtalks, will explain about FAST acronym in this video. FAST is an acronym for early diagnosis of stroke or paralysis. F means facial dropping, A means weakness of the upper or lower arm, S means speech difficulty and T means time denoting how long these symptoms were present. If these symptoms are present for an hour and a clot dissolving medicine is given immediately then stroke can be reversed. This period is known as the golden hour. He will further talk about the second window period which is of 4.5 hours in which the TPA or clot dissolving medicine should be given.