Why are doctors so concerned about Bush's bronchitis?

Published On: Nov 29 2012 06:15:10 PM CST   Updated On: Nov 29 2012 11:04:40 AM CST

Nov. 29, 2012: Former President George H.W. Bush is in a Houston hospital as doctors battle a lingering cough that has drawn concern, officials say. Doctors talk about why an older patient needs to be monitored closely. Rachel McNeill reports.