The Blue Jackets showed signs of life - and perhaps even of being a hockey team - at several points during Friday's game against the Maple Leafs, but continued mental mistakes and uneven levels of effort lead to yet another late game collapse.
Fibrillation is the medical term used to describe two different types of erratic, irregular contractions of the heart.
Atrial Fibrillation, or "A-fib" is concerning, but can generally be treated with medication and managed, if not entirely eliminated, without serious threat to life.
Ventricular Fibrillation, on the other hand, is generally seen during cardiac arrest, and if it is not stopped quickly (usually with those neat zappy electric paddles you see on TV), it will almost certainly be fatal.