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Figure 3 Pulsed-wave Doppler echocardiographic recordings of the left ventricular inflow measured at the tips between the mitral leaflets. The cycle length during DDD pacing was mathematically adjusted to the cycle length of the tracing in VDD mode (A). Note the complete fusion of early diastolic and atrial filling observed in the DDD mode (A), whereas in the VDD mode the peak of the E- and the A-wave are still clearly separated (B). These Doppler tracings are representative for the findings observed in five (29%) patients.