A system for accelerating confirmation of cardiac arrhythmias is provided. The system includes memory (160) to store specific executable instructions. One or more processors (121) are configured to execute the specific executable instructions for obtaining a far field cardiac activity (CA) data set (620) that includes far field CA signals for a series of beats. The CA data set (620) includes a first CA data subset (622) and a remainder CA data subset (624). The system analyzes the CA data set (620) for an arrhythmia of interest utilizing a primary detection process (136) having primary criteria. During a first phase of the primary detection process (136) the system analyzes the first CA data subset (622) to determine whether the first CA data subset (622) satisfies at least a portion of the primary criteria. When the first CA data subset (622) satisfies at least the portion of the primary criteria, the system initiates a secondary confirmation process (137). Parallel and contemporaneous in time the system i) analyzes the first CA data subset (622) utilizing secondary criteria associated with the secondary confirmation process (137) and ii) analyzes the remainder CA data subset (624) utilizing the primary criteria. The system declares the CA data set (620) to exhibit an arrhythmia episode when the first CA data subset (622) satisfies the secondary criteria and the remainder CA data subset (624) satisfies a remainder of the primary criteria.
