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Atrio-ventricular delay optimization during the atrial-paced rhythm (75 bpm) according to mitral inflow velocity waveforms. A – AVD paced at 100 ms was too short – monophasic mitral inflow was present, B – starting with AVD paced at 160 ms a tiny atrial A-wave appeared, C – AVD paced at 190 ms was optimal since it provided the longest DFTLV without atrial A-wave truncation, D – with AVD paced at 200 ms and longer, truncation of the atrial A-wave was present
