1. A machine-assisted method for automatically characterizing a tachyarrhythmia, the method comprising: analyzing the tachyarrhythmia at a processor circuit by: obtaining from a first detector executing a first tachyarrhythmia characterization technique, a current first primary characterization of the tachyarrhythmia and a current first primary confidence level of the current first primary characterization; obtaining from a second detector executing a second tachyarrhythmia characterization technique, a current second primary characterization of the tachyarrhythmia and a current second primary confidence level of the current second primary characterization, wherein the second tachyarrhythmia characterization technique is different from the first tachyarrhythmia characterization technique, and wherein the second detector is different from the first detector; and determining a current secondary characterization of the tachyarrhythmia by probabilistically fusing the current first primary characterization, the current first primary confidence level, the current second primary characterization, and the current second primary confidence level.