When we are in the embryonic phase, our heart still consists of a sponge-like web of muscle fibers.
When we get older, the heart muscle becomes more solid.
When this conversion process of sponge-like to solid (compact) does not or only limited takes place, the heart (an especially the left ventricle) will keep a certain amount of that spongy tissue.
This spongy tissue does not perform such a good pumping task as the solid tissue can, which can cause breathlessness, fatigue, etc.
The ratio of compact and non-compact tissue is measured in the echo and in your case reported as R 1:1.5.
Medication like ACE inhibitors, beta blockers and aspirin are often prescribed to relieve the pressure on the heart.
Talk to your cardiologist about the consequences for you.
Thanks again for all your help