Will simultaneous measurement of E/e' index facilitate the non-invasive assessment of left ventricular filling pressure in patients with non-valvular atrial fibrillation?

Aims The ratio of early transmitral flow velocity ( E ) to early diastolic mitral annular velocity ( e ') was applied as a non-invasive index to assess left ventricular filling pressure (LVFP). However, the reliability of E / e ' was undermined in patients with atrial fibrillation (AF). Recently, a novel method entitled 'dual Doppler' was established, which allows simultaneous recording and display of E and e '. Our study investigates whether the dual-Doppler method improves the reliability of E/e ' in AF patients.