Simulation environment

For every cord model, multiple simulations are possible for the following reasons:

1. within the permited range of variation, the actual values of the baseline parameters may be selected in a very large number of ways; in every simulation, one combination of them is selected randomly;
2. the early afterdepolarization of any cell takes place randomly (its probablity is a property of every cell), and the actual incidence will vary from a simulation to the next; these afterdepolarizations may be lead to complex electrophisiological phenomena in the cord model, later;

   Future versions of the program may also have other features associated with random occourence, such as late afterdepolarizations.

3. any cord model can be simulated under various conditions of fluctuation of the external factors; it is typical to see how the results of the simulation change when a drug is added;

4. some external events, such as the application of an electric shock or of local pacing, may be applied at various moments to the same model, or not be applied at all;

5. after a simulation one may desire to read the results of the simulation using different ECG electrode placements;

A combination of some or all of these external conditions, valid for a given cord model, define a simulation scenario. The principles of specifying these external conditions are described in this section.