Former President George W. Bush's recent heart problems were a lot more serious than everyone thought. Although Bush was one of the most active presidents, a potentially life-threatening blocked artery was found during a physical exam at the Cooper Clinic in Dallas, according to a report in the National Journal Monday. At his doctor's recommendation, Bush agreed to have a stent placed into the artery to open the blockage. Bush's situation was more dangerous than previously reported, but the presence of a blocked artery didn't mean he was immediately at risk of having a heart attack, doctors said. And even though the former president was physically fit, doctors said years of unhealthy food choices could lead to heart disease.