The role of one major cause of stroke, atrial fibrillation (AF), has not been the subject of close scrutiny.

FORBES: Study Examines New-Onset Atrial Fibrillation After TAVI

The government's watchdog NICE says patients with atrial fibrillation (AF), an erratic and sometimes fast heartbeat, can now have rivaroxiban instead of the existing drug warfarin.

BBC: New clot drug recommended to NHS for heart patients

The 663 patient trial compared patients with a type of atrial fibrillation called paroxysmal AF, giving half the fish oil pill and half a placebo.

FORBES: From Fish Oil to Snake Oil: Glaxo Fish Oil Pill Bombs In Heart Rhythm Study