Abstract
Right-ventricular bifocal pacing (RVBF) was reported as a therapy of severe congestive heart failure. We evaluated regional wall motion by strain Doppler imaging in three patients with RVBF therapy who had conventional indication of pacemaker(70± 8 years old, mean ejection fraction 24±11%). Two dimensional SDI of the left ventricle were obtained from the apical four-chamber view during right ventricular apical pacing and RVBF pacing. Wall motion was assessed by strain of the myocardium and interval between Q-wave of surface ECG and peak of strain(QPSI) was measured in the three septal and lateral segments. Results were shown in table. RVBF pacing improves intra-ventricular contraction delay especially longitudinal dyssynchrony without improvement of left ventricle strain. View this table:
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