The left side of the heart (LV) will have a thicker wall dimension because it is pumping against higher resistance and needs stronger contractility. The right ventricle should be smaller, and if it is abnormally large that could indicate the heart is pumping against higher than normal resistance. The resistance can be due to stenosis (narrowing) of pulmonary vessel, thrombosis (blood clots) and/or pulmonary emboli (clots), etc. Worst case scenario.
Thanks for the quesiton, and if you have any further quesitons or comments you are welcome to respond. Take care,
Ken