Mean QRS, ventricular gradient and left ventricular mass in patients with eccentric left ventricular hypertrophy.

The spatial ventricular gradient (G) and the mean QRS-T angle were examined in 12 patients with angiographically determined eccentric left ventricular hypertrophy (LVH), as compared with 12 normal control subjects. In these 24 patients, a high significant correlation (r = 0.88) was obtained between the magnitude of the spatial mean QRS and LV mass. Although correlations were obtained between the magnitude of the spatial G or the spatial mean QRS-T angle and LV mass, they were lower (r = 0.56, 0.71 respectively). The magnitude of the spatial G (0.190 +/- 0.049 MVSec) in the eccentric LVH group increased significantly (p less than 0.001) in comparison with the control value (0.105 +/- 0.032 mVSec), while in the eccentric LVH group, decreased G/QRS (p less than 0.02), decreased T/QRS (p less than 0.05), and increased QRS-T angle (p less than 0.02) were observed. Furthermore, decreased G/QRS and widening of the QRS-T angle were observed in cases of LVH only. In cases of mild or moderate LVH, normal G/QRS ratios with definitely increased G magnitude and normal QRS-T angle were observed. It is concluded that the magnitude of the spatial mean QRS closely relates to an increase in LV mass. Therefore, should the magnitude of G increase proportionally to an increase in total muscle volume in ideal hypertrophy, then the widening of the QRS-T angle observed in LVH would be due not only to the large ARS complex but also to an alteration in the ventricular gradient.