A system and method for detecting a patient’s susceptibility to arrhythmias and cardiac tissue abnormality is disclosed. This base member has a central opening that tapers inward from a top surface to a bottom surface. 2 msec and where the liquid residence time is not more than 100 seconds. In typical operation, the game client generates a pass-phrase that transparently includes a unique identifier of the machine upon which the subscription software will reside. The portable machine-readable image may thus be used for the convenient storage of information items to be used in either online or offline gaming environments.