Hello, I'm a 52 year old male. 4 years ago I had two stents in an angioplasty to unblock two of my heart's arteries. For some few weeks now I have noticed that I have difficulty walking. Now, when I walk more than 50 yards at normal pace my right leg goes numb and I have to stop walking. It starts off as a cold sensation at the base of my right buttock and then it's as if my leg goes to sleep. After usually 4 to 5 minutes sensation returns again. Also, when I climb stairs it's as if I've run a marathon my legs feel that tired. Should I be worried?