Ed Augustin never thought twice about the cramps he got in his leg while walking around his Lake Barrington neighborhood.

But the pain worsened week by week for the 79-year-old, and soon he barely could walk a short distance without having to stop and rest. It then got so severe he was forced to see a physician.

“It was like a charley horse that wouldn’t go away,” said Augustin, who has survived two coronary bypass surgeries. “It was just constant pain.”