1. A machine-assisted method for automatically characterizing a tachyarrhythmia, the method comprising: obtaining a current first primary characterization of the tachyarrhythmia and a current first primary confidence level of the current first primary characterization; obtaining a current second primary characterization of the tachyarrhythmia and a current second primary confidence level of the current second primary characterization; and determining a current secondary characterization using the current first primary characterization, the current first primary confidence level, the current second primary characterization, and the current second primary confidence level.