There are muscles in the arteries that dilate/contract in times of need/stress - allowing more blood flow, or restricting the diameter to increase blood pressure - unless you arteries are stiff and calcified. In theory calcified arteries from lack of vitamin K (usually induced by heart medications by the way) would overcome any advantage that NO induced from arginine might offer. However, Arginine has many other helpful benefits, especially for men
https://www.ncbi.nlm.nih.gov/pubmed/?term=calcification+warfarin