Sigh. Never assume anything. Not even what your doctor tells you.

"Eicosapentaeneoic acid" _doesn't_ appear to mean eleven carbons, no matter what I said above. It's twenty carbons after all. Pentaene- remains the same five double-bonds, though.

I'm going to have to review a few of those details. The bottom line, however, remains as stated: significant reduction in sudden cardiac death.