Bill Clinton, who recently underwent a successful heart surgery, said he knew something was wrong with him when he saw himself on "Nightline."
"I saw an interview I did with 'Nightline' in Haiti which terrified me," he said Wednesday. "I looked like I was 185 years old. My color was bad."
Clinton was interviewed by Cynthia McFadden earlier this month from Haiti, where he helped coordinate international earthquake relief.
"Once the Haiti earthquake happened I didn't sleep much for a month, and that probably accelerated what was already going on with this failing vein," he added.