Noninvasive assessment of exercise tolerance using mitral annular velocities

作者：Hadano Yasuyuki^*; Matsuzaki Masunori

来源：Journal of Medical Ultrasonics, 2016, 43(1): 37-45.

DOI：10.1007/s10396-015-0672-y

• Mitral annular velocity
• Tissue Doppler imaging
• Exercise tolerance

To investigate the feasibility of evaluating exercise tolerance using lateral and septal mitral annular velocities in patients with preserved left ventricular ejection fraction (LVEF) and those with reduced LVEF.
We studied 36 patients with LVEF a parts per thousand yen50 % and 36 with LVEF < 50 %. We measured peak early diastolic velocity of transmitral flow (E) and peak early diastolic velocities of the lateral (LEa) and septal (SEa) mitral annulus. The ratios of E to LEa (E/LEa) and E to SEa (E/SEa) were calculated. We measured peak oxygen consumption and anaerobic threshold (AT) by cardiopulmonary exercise testing.
In patients with LVEF a parts per thousand yen50 %, E/LEa correlated well with and AT (r = -0.69 and r = -0.74, respectively; p < 0.001); E/SEa correlated modestly (r = -0.59 and r = -0.60, respectively; p < 0.001). In patients with LVEF < 50 %, E/LEa correlated well with and AT (r = -0.72 and r = -0.76; respectively, p < 0.001); E/SEa correlated modestly (r = -0.63 and r = -0.63, respectively; p < 0.001).
E/LEa may be more useful than E/SEa for the noninvasive estimation of exercise tolerance, throughout a wide range of LVEF.

• 出版日期2016-1