Success--failure diagram for defibrillation.

A new method for presenting defibrillation threshold data (current, voltage or energy) is presented in the form of a success--failure diagram, the y-axis of which is the shock strength employed. A vertical line divides the successful shocks from the unsuccessful shocks for each shock strength. The diagram shows clearly how many shocks have been given at each strength and how the success for defibrillation increases with increasing shock strength.