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Figure 2 The QRS duration over time. (A) Solid lines represent values during spontaneous rhythm and dotted lines those during biventricular (BiV) pacing in the sinus rhythm group. (B) For the atrial fibrillation group, solid lines represent values during right ventricular pacing at a rate of 70 beats/min and dotted lines those during BiV pacing. CO = cardiac output; M3 = three months; M6 = six months; M9 = nine months; M12 = 12 months; NoP = inactive pacing; RV = right ventricle.
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