It's possible you have PAD, peripheral artery disease. I had a blockage in my Iliac artery that supplied blood flow to my leg. The same plaque that blocks arteries in the heart can block arteries anywhere. I have a blocked artery behind my retina that caused blindness in one eye.
PAD symptoms almost always occur only when exercising. When do you experience your discomfort? If you experience this type of discomfort when at rest, it very well could be a compression of the sciatic nerve. This type of (considerable) discomfort occurs both at rest and certainly when one is active. PAD symptoms generally occur after a few minutes of exercise. I'm betting you have a nerve issue, not a cardiac issue. Keep us informed.
Are you on statins? if so, maybe you need to be on a different brand. Statins in some people can cause serious muscle problems. I don't think your LAD will be the issue here. They can do a CT angio of your leg and check blood flow, then they can laser the vessels if necessary.
When does the pain occur? E.g. I have a similar problem, but the pain is not constant and my upper left thigh is permanently numb. Nothing to do with my veins or blockages - comes from the spine, at least in my case and my LAD is full of crap too.
This can be related with the spine but indirectly caused by your heart.
After they removed the catheter how was it sealed? in my case I had 3 times strong pressure on the groin for at least 20 minutes to seal the artery... enough to produce an extra protrusion to my already damaged lumbar disks!!!
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