(A) ECG at 1 min, after the first bolus of ajmaline. (B) ECG at 2 min, after the second bolus of ajmaline. (C) ECG at 3 min, after the third bolus of ajmaline. (D) ECG at 4 min, after the fourth bolus of ajmaline, showing a slight, though not significative, prolongation of the QRS. (E) ECG at 5 min, after the last infusion of ajmaline, showing significative QRS prolongation and emergence of Brugada type 1 pattern.