From the article:
The study compared the effectiveness of emulsions with two omega-3 fatty acids – DHA and eicosapentaenoic acid (EPA) – as well as optimal doses and therapeutic window. The researchers found that DHA provided protection while EPA did not. The therapeutic window ranged from 90 minutes prior to several hours after with the optimal window for treatment 0 – 2 hours.
Dr. Bazan’s group at the LSU Health Sciences Center New Orleans Neuroscience Center of Excellence has increasingly shown that DHA is a potentially powerful treatment for stroke for nearly ten years. His study published in 2011 found DHA triggered production of Neuroprotectin D1 (NPD1), a naturally occurring neuroprotective molecule in the brain derived from DHA and discovered by Dr. Bazan. Not only did DHA treatment salvage stroke-damaged brain tissue that would have died, its repair mechanisms rendered some areas indistinguishable from normal tissue by 7 days.