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Figure 3 Effects of long-term right ventricular (RV) pacing on clinical status and left ventricular ejection fraction (LVEF). (A) In patients with LV dyssynchrony, New York Heart Association (NYHA) functional class deteriorated significantly, whereas NYHA functional class improved significantly in patients without LV dyssynchrony. (B) LV ejection fraction decreased significantly in patients with LV dyssynchrony after long-term RV pacing. *p < 0.05 baseline versus follow-up; p < 0.05 with dyssynchrony versus without dyssynchrony. White columns = baseline; black columns = follow-up.