I have really tight outlet and thus compression...I had to have stenosed Sub clav addressed. At time surgeon commented that the overall size of my vessels is markedly smaller than the norm ( oh to be normal!). Post re do surg on left side and stenosis addressed I do have better blood flow but still can pinch vessel of in certain positions. I have lots of spasm and lovely colour changes in hands. Tis all fun...Basically need to weigh up options carefully and respond to condition accordingly.
Best wishes all...Happy Halloween