LVH

The things that happen in LVH are:

- QRS widens and as part of this, the intrinsicoid deflection in V6 ("the downward deflection after the peak of the R wave" aka the downward dog of ECG yoga) increases.

- QRS biggens such that have tall R6 and deep S1.

- axis shifts to left

- J point depresses and there is a convex upwards subtype of downsloping ST depression

There are several criteria:
CORNELL (S3 + RL >20 for women or 24 for men)
SOKOLOW (S1+R5/6>34, RL>10, RI+SIII>25)...and if LAD, then RL>12 AND SIII>14
ESTES

ESTES	Points
Voltage Criteria (any of): R or S in limb leads >20 mm S in V1 or V2 > 30 mm R in V5 or V6 >30 mm	3 points
ST-T Abnormalities: Without digitalis With digitalis	3 points 1 point
Left Atrial Enlargement in V1	3 points
Left axis deviation	2 points
QRS duration 0.09 sec	1 point
Delayed intrinsicoid deflection in V5 or V6 (>0.05 sec)	1 point