You are correct about this, Ted.Ted Dinwiddie wrote:
As an aside This has been more common in lacrosse than many may realize. There has been a recent movement to always have a defribrilator(sp?) on the sidelines at ALL games. Apparently, this is the only way to restart the heart in these cases.
The result of commotio cordis is ventricular fibrillation. In short, the cells in the heart wall completely lose their synchronization.
Imagine a skull (in crew) with all the oarsmen trying to row at random intervals. You aren't going to get anywhere. The only way to get things going again is for everyone to stop at some point in the cycle, and start all over again. This is what you accomplish with cardiac defibrillation. The electrical jolt makes all cells synchronize so they can start again with the normal synchronized contraction pattern.
When commotio cordis happens on the playing field and there isn't a defibrillator around, your only (slim) hope is to do CPR until an ambulance arrives. They have the epinephrine, lydocaine, and defibrillator on board to do it right, assuming you've managed to preserve brain and body tissue in-between a 911 call and their arrival.
Modern defibrillators do the job pretty well with little intervention - thanks to biomedical engineering.

- Bill