Abstract 706: Transient Pseudorestrictive Pattern of Transmitral Doppler Flow Pattern in Patients with Paroxysmal Atrial Fibrillation
Standard pulsed Doppler indices are inadequate for assessment of LV relaxation in patients with atrial fibrillation (AF). On the other hand, peak diastolic mitral annulus velocities (Ea) and color M-mode Doppler propagation velocity of mitral inflow (Vp) have been reported as reliable determinants of LV relaxation in those patients. There have been few reports on alteration of LV relaxation during paroxysmal AF. Thirty patients with paroxysmal AF were enrolled in this study. Standard 2 dimensional, color flow Doppler, and tissue Doppler echocardiography were performed before, during AF, and after conversion of AF within 24 hours. LV relaxation was compared among three periods. Early diastolic velocity of TMF (E-wave) was increased, and deceleration time was shortened significantly during AF. Furthermore, systolic velocity of pulmonary vein flow was decreased, and diastolic velocity was increased significantly during AF. These parameters returned to the baseline level after conversion of AF. On the other hand, Ea was increased during AF. which returned to the baseline level after conversion of AF. Vp did not change during AF. There was pseudorestrictive pattern of transmitral flow velocity during AF. LV relaxation estimated by Ea and Vp were preserved during this period. This phenomenon diminished after conversion to sinus rhythm.