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Frequency of occurrence of bipolar electrogram voltage patterns. Frequency of occurrences of each category of bipolar voltage patterns is shown. At both low and high voltage, attenuation +ve patterns were significantly more common than attenuation –ve patterns; with the high voltage, attenuation +ve pattern (HP;A+) being the most common pattern overall. A: frequencies for the entire study population. B: frequencies for patients with and without recurrence of arrhythmia postablation
