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Figure 1: (a) Lead V4; broad QRS complex (0.20 s) after 9 oral doses of flecainide at 1.7 times the recommended upper limit. (b) Lead V4; complete reversion of the electrocardiogram abnormalities. Normal electrocardiogram findings on the 3rd day after stopping flecainide completely

Figure 1: (a) Lead V4; broad QRS complex (0.20 s) after 9 oral doses of flecainide at 1.7 times the recommended upper limit. (b) Lead V4; complete reversion of the electrocardiogram abnormalities. Normal electrocardiogram findings on the 3<sup>rd</sup> day after stopping flecainide completely