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Figure 5 Changes in mitral regurgitation according to different pacing modes. (A) Spontaneous sinus rhythm showing severe mitral regurgitation. (B) Simultaneous biventricular pacing, showing significant reduction in mitral regurgitation. (C) Further reduction of mitral regurgitation after biventricular pacing with optimized interventricular delay (left ventricular pre-activation of 20 ms).
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